NOTE. The video is best viewed in HD 1080p (1920×1080) with a display that allows for this or greater video quality, and a screen big enough to see haplogroup symbols, i.e. tablet or greater. The YouTube link is here. The Facebook link is here.
Based on the results of the past 5 years or so, which have been confirming this combined picture every single time, I doubt there will be much need to change it in any radical way, as only minor details remain to be clarified.
I wanted to publish a GIS tool of my own for everyone to have an updated reference of all data I use for my books.
The most complex GIS tools consume too many resources when used online in a client-server model, so I have to keep that to myself, but there are some ways to publish low quality outputs.
The files below include the possibility to zoom some levels to be able to see more samples, and also to check each one for more information on their ID, attributed culture and label, archaeological site, source paper, subclade (and people responsible for SNP inferences if any), etc.
Some usage notes:
Files are large (ca. 20 Mb), so they still take some time to load.
For the meaning of symbols and colors (for Y-DNA haplogroups), if there is any doubt, check the video above.
Pop-ups with sample information will work on desktop browsers by clicking on them, apparently not on smartphone and related tactile OS. I have changed the settings to show pop-ups on hover, so that it now works (to some extent) on tactile OS.
The search tool can look for specific samples according to their official ID, and works by highlighting the symbol of the selected individual (turning it into a bright blue dot), and leading the layer view to the location, but it seems to work best only with some browser and OS settings – in other browsers, you need to zoom out to see where the dot is located. The specific sample with its information could paradoxically disappear in search mode, so you might need to reload and look again for the same site that was highlighted.
Latitude and longitude values have been randomly modified to avoid samples overcrowding specific sites, so they are not the original ones.
New paper (behind paywall) by David Anthony, Archaeology, Genetics, and Language in the Steppes: A Comment on Bomhard, complementing in a favourable way Bomhard’s Caucasian substrate hypothesis in the current issue of the JIES.
NOTE. I have tried to access this issue for some days, but it’s just not indexed in my university library online service (ProQuest) yet. This particular paper is on Academia.edu, though, as are Bomhard’s papers on this issue in his site.
Interesting excerpts (emphasis mine):
Along the banks of the lower Volga many excavated hunting-fishing camp sites are dated 6200-4500 BC. They could be the source of CHG ancestry in the steppes. At about 6200 BC, when these camps were first established at Kair Shak III and Varfolomievka (42 and 28 on Figure 2), they hunted primarily saiga antelope around Dzhangar, south of the lower Volga, and almost exclusively onagers in the drier desert-steppes at Kair-Shak, north of the lower Volga. Farther north at the lower/middle Volga ecotone, at sites such as Varfolomievka and Oroshaemoe hunter-fishers who made pottery similar to that at Kair-Shak hunted onagers and saiga antelope in the desert-steppe, horses in the steppe, and aurochs in the riverine forests. Finally, in the Volga steppes north of Saratov and near Samara, hunter-fishers who made a different kind of pottery (Samara type) and hunted wild horses and red deer definitely were EHG. A Samara hunter-gatherer of this era buried at Lebyazhinka IV, dated 5600-5500 BC, was one of the first named examples of the EHG genetic type (Haak et al. 2015). This individual, like others from the same region, had no or very little CHG ancestry. The CHG mating network had not yet reached Samara by 5500 BC.
But before 4500 BC, CHG ancestry appeared among the EHG hunter-fishers in the middle Volga steppes from Samara to Saratov, at the same time that domesticated cattle and sheep-goats appeared. The Reich lab now has whole-genome aDNA data from more than 30 individuals from three Eneolithic cemeteries in the Volga steppes between the cities of Saratov and Samara (Khlopkov Bugor, Khvalynsk, and Ekaterinovka), all dated around the middle of the fifth millennium BC. Many dates from human bone are older, even before 5000 BC, but they are affected by strong reservoir effects, derived from a diet rich in fish, making them appear too old (Shishlina et al 2009), so the dates I use here accord with published and unpublished dates from a few dated animal bones (not fish-eaters) in graves.
Only three individuals from Khvalynsk are published, and they were first published in a report that did not mention the site in the text (Mathieson et al. 2015), so they went largely unnoticed. Nevertheless, they are crucial for understanding the evolution of the Yamnaya mating network in the steppes. They were mentioned briefly in Damgaard et al (2018) but were not graphed. They were re-analyzed and their admixture components were illustrated in a bar graph in Wang et al (2018: figure 2c), but they are not the principal focus of any published study. All of the authors who examined them agreed that these three Khvalynsk individuals, dated about 4500 BC, showed EHG ancestry admixed substantially with CHG, and not a trace of Anatolian Farmer ancestry, so the CHG was a Hotu-Cave or Kotias-Cave type of un-admixed CHG. The proportion of CHG in the Wang et al. (2018) bar graphs is about 20-30% in two individuals, substantially less CHG than in Yamnaya; but the third Khvalynsk individual had more than 50% CHG, like Yamnaya. The ca. 30 additional unpublished individuals from three middle Volga Eneolithic cemeteries, including Khvalynsk, preliminarily show the same admixed EHG/CHG ancestry in varying proportions. Most of the males belonged to Y-chromosome haplogroup R1b1a, like almost all Yamnaya males, but Khvalynsk also had some minority Y-chromosome haplogroups (R1a, Q1a, J, I2a2) that do not appear or appear only rarely (I2a2) in Yamnaya graves.
Wang et al. (2018) discovered that this middle Volga mating network extended down to the North Caucasian steppes, where at cemeteries such as Progress-2 and Vonyuchka, dated 4300 BC, the same Khvalynsk-type ancestry appeared, an admixture of CHG and EHG with no Anatolian Farmer ancestry, with steppe-derived Y-chromosome haplogroup R1b. These three individuals in the North Caucasus steppes had higher proportions of CHG, overlapping Yamnaya. Without any doubt, a CHG population that was not admixed with Anatolian Farmers mated with EHG populations in the Volga steppes and in the North Caucasus steppes before 4500 BC. We can refer to this admixture as pre-Yamnaya, because it makes the best currently known genetic ancestor for EHG/CHG R1b Yamnaya genomes. The Progress-2 individuals from North Caucasus steppe graves lived not far from the pre-Maikop farmers of the Belaya valley, but they did not exchange mates, according to their DNA.
The hunter-fisher camps that first appeared on the lower Volga around 6200 BC could represent the migration northward of un-admixed CHG hunter-fishers from the steppe parts of the southeastern Caucasus, a speculation that awaits confirmation from aDNA. After 5000 BC domesticated animals appeared in these same sites in the lower Volga, and in new ones, and in grave sacrifices at Khvalynsk and Ekaterinovka. CHG genes and domesticated animals flowed north up the Volga, and EHG genes flowed south into the North Caucasus steppes, and the two components became admixed. After approximately 4500 BC the Khvalynsk archaeological culture united the lower and middle Volga archaeological sites into one variable archaeological culture that kept domesticated sheep, goats, and cattle (and possibly horses). In my estimation, Khvalynsk might represent the oldest phase of PIE.
Anatolian Farmer ancestry and Yamnaya origins
The Eneolithic Volga-North Caucasus mating network (Khvalynsk/Progress-2 type) exhibited EHG/CHG admixtures and Y-chromosome haplogroups similar to Yamnaya, but without Yamnaya’s additional Anatolian Farmer ancestry. (…)
Like the Mesolithic and Neolithic populations here, the Eneolithic populations of Dnieper-Donets II type seem to have limited their mating network to the rich, strategic region they occupied, centered on the Rapids. The absence of CHG shows that they did not mate frequently if at all with the people of the Volga steppes, a surprising but undeniable discovery. Archaeologists have seen connections in ornament types and in some details of funeral ritual between Dnieper-Donets cemeteries of the Mariupol-Nikol’skoe type and cemeteries in the middle Volga steppes such as Khvalynsk and S’yez’zhe (Vasiliev 1981:122-123). Also their cranio-facial types were judged to be similar (Bogdanov and Khokhlov 2012:212). So it it surprising that their aDNA does not indicate any genetic admixture with Khvalynsk or Progress-2. Also, neither they nor the Volga steppe Eneolithic populations showed any Anatolian Farmer ancestry. (…)
All three of the steppe-admixed exceptions were from the Varna region (Mathieson et al. 2018). One of them was the famous “golden man’ at Varna (Krause et al. 2016), Grave 43, whose steppe ancestry was the most doubtful of the three. If he had steppe ancestry, it was sufficiently distant (five+ generations before him) that he was not a statistically significant outlier, but he was displaced in the steppe direction, away from the central values of the majority of typical Anatolian Farmers at Varna and elsewhere. The other two, at Varna (grave 158, a 5-7-year-old girl) and Smyadovo (grave 29, a male 20-25 years old), were statistically significant outliers who had recent steppe ancestry (consistent with grandparents or great-grandparents) of the EHG/CHG Khvalynsk/Progress-2 type, not of the Dnieper Rapids EHG/WHG type.
(…) I believe that the Suvorovo-Cernavoda I movement into the lower Danube valley and the Balkans about 4300 BC separated early PIE-speakers (pre-Anatolian) from the steppe population that stayed behind in the steppes and that later developed into late PIE and Yamnaya.
This archaeological transition marked the breakdown of the mating barrier between steppe and Anatolian Farmer mating networks. After this 4300-4200 BC event, Anatolian Farmer ancestry began to pop up in the steppes. The currently oldest sample with Anatolian Farmer ancestry in the steppes in an individual at Aleksandriya, a Sredni Stog cemetery on the Donets in eastern Ukraine. Sredni Stog has often been discussed as a possible Yamnaya ancestor in Ukraine (Anthony 2007: 239- 254). The single published grave is dated about 4000 BC (4045– 3974 calBC/ 5215±20 BP/ PSUAMS-2832) and shows 20% Anatolian Farmer ancestry and 80% Khvalynsk-type steppe ancestry (CHG&EHG). His Y-chromosome haplogroup was R1a-Z93, similar to the later Sintashta culture and to South Asian Indo-Aryans, and he is the earliest known sample to show the genetic adaptation to lactase persistence (I3910-T). Another pre-Yamnaya grave with Anatolian Farmer ancestry was analyzed from the Dnieper valley at Dereivka, dated 3600-3400 BC (grave 73, 3634–3377 calBC/ 4725±25 BP/ UCIAMS-186349). She also had 20% Anatolian Farmer ancestry, but she showed less CHG than Aleksandriya and more Dereivka-1 ancestry, not surprising for a Dnieper valley sample, but also showing that the old fifth-millennium-type EHG/WHG Dnieper ancestry survived into the fourth millennium BC in the Dnieper valley (Mathieson et al. 2018).
Probably, late PIE (Yamnaya) evolved in the same part of the steppes—the Volga-Caucasus steppes between the lower Don, the lower and middle Volga, and the North Caucasus piedmont—where early PIE evolved, and where appropriate EHG/CHG admixtures and Y-chromosome haplogroups were seen already in the Eneolithic (without Anatolian Farmer). There have always been archaeologists who argued for an origin of Yamnaya in the Volga steppes, including Gimbutas (1963), Merpert (1974), and recently Morgunova (2014), who argued that this was where Repin-type ceramics, an important early Yamnaya pottery type, first appeared in dated contexts before Yamnaya, about 3600 BC. The genetic evidence is consistent with Yamnaya EHG/CHG origins in the Volga-Caucasus steppes. Also, if contact with the Maikop culture was a fundamental cause of the innovations in transport and metallurgy that defined the Yamnaya culture, then the lower Don-North Caucasus-lower Volga steppes, closest to the North Caucasus, would be where the earliest phase is expected.
I would still guess that the Darkveti-Meshoko culture and its descendant Maikop culture established the linguistic ancestor of the Northwest Caucasian languages in approximately the region where they remained. I also accept the general consensus that the appearance of the hierarchical Maikop culture about 3600 BC had profound effects on pre-Yamnaya and early Yamnaya steppe cultures. Yamnaya metallurgy borrowed from the Maikop culture two-sided molds, tanged daggers, cast shaft hole axes with a single blade, and arsenical copper. Wheeled vehicles might have entered the steppes through Maikop, revolutionizing steppe economies and making Yamnaya pastoral nomadism possible after 3300 BC.
For those who still hoped that Proto-Indo-Europeans of Yamnaya/Afanasievo ancestry from the Don-Volga region were associated with the expansion of hg. R1a-M417, in a sort of mythical “R1-rich” Indo-European society, it seems this is going to be yet another prediction based on ancestry magic that goes wrong.
Proto-Indo-Europeans were, however, associated with other subclades beyond R1b-M269, probably (as I wrote recently) R1b-V1636, I2a-L699, Q1a-M25, and R1a-YP1272, but also interestingly some J subclade, so let’s see what surprises the new study on Khvalynsk and Yamnaya settlers from the Carpathian Basin brings…
On the bright side, it is indirectly confirmed that late Sredni Stog formed part of the neighbouring Corded Ware-like populations of ca. 20-30%+ Anatolian farmer ancestry that gave Yamnaya its share (ca. 6-10%), relative to the comparatively unmixed Khvalynsk and late Repin population (as shown by Afanasevo).
In this steppe mating network that opened up after the Khvalynsk expansion, the increasing admixture of Anatolian farmer-related ancestry in Yamnaya from east (ca. 2-10%) to west (ca. 6-15%) points to an exogamy of late Repin males in their western/south-western regions with populations around the Don River basin and beyond (and endogamy within the Yamnaya community), in an evolution relevant for language expansions and language contacts during the Late Eneolithic.
NOTE. “Mating network” is my new preferred term for “ancestry”. Also great to see scholars finally talk about “Pre-Yamnaya” ancestry, which – combined with the distinction of Yamnaya from Corded Ware ancestry – will no doubt help differentiate fine-scale population movements of steppe- and forest-steppe-related populations.
Especially because Corded Ware fully replaced all sub-Neolithic groups to the north and east of Khvalynsk/Yamnaya, like Volosovo, so no other population neighbouring Middle and Late Proto-Indo-Europeans survived into the Bronze Age…
Given my reduced free time in these months, I have decided to keep updating the text on Indo-European and Uralic migrations and/or this blog, simultaneously or alternatively, to make the most out of the time I can dedicate to this. I will add the different ‘A Song of Sheep and Horses (ASoSaH) reread’ posts to the original post announcing the books. I would be especially interested in comments and corrections to the book chapters rather than the posts, but any comments are welcome (including in the forum, where comments are more likely to stick).
Luckily enough – for those of us who want precise answers to our previous infinite models of Indo-European language expansions (viz. GAC-associated expansion, IE-speaking Old Europe, Anatolian homeland, Iran homeland, Maykop as Proto-Anatolian, Palaeolithic Continuity Theory, Celtic in the Atlantic façade, etc.) – the situation has been more clear-cut than expected: it turns out that, especially during population expansions, acute Y-chromosome bottlenecks were very common in the past, at least until the Iron Age.
Khvalynsk and Repin-Yamna expansions were no different, and that seems quite natural in hindsight, given the strong familial ties and aversion to foreigners proper of the Late Proto-Indo-European society and culture – probably not really that different from other contemporary societies, like the neighbouring Late Proto-Uralic or Trypillian ones.
During the expansion of early Khvalynsk, the most likely Indo-Anatolian culture, the society of the Don-Volga area was probably made up of different lineages including R1b-V1636, R1b-M269, R1a-YP1272, Q1a-M25, and I2a-L699 (and possibly some R1b-V88?), a variability possibly greater than that of the contemporary north Pontic area, probably a sign of this region being a sink of different east and west migrations from steppe and forest areas.
During its expansion, the Khvalynsk society saw its haplogroup variability reduced, as evidenced by the succeeding expansive Repin culture:
Afanasevo, representing Pre-Tocharian (the earliest Late PIE dialect to branch off), expanded with R1b-L23 – especially R1b-Z2103 – lineages, while early Yamna expanded with R1b-L23 and I2a-L699 lineages, which suggests that these are the main haplogroups that survived the Y-DNA bottleneck undergone during the Khvalynsk expansion, and especially later during the late Repin expansion. Nevertheless, other old haplogroups might still pop up during the Repin and early Yamna period, such as the R1b-V1636 sample from Yamna in the Northern Caucasus.
It is still unclear if R1b-L23 sister clade R1b-PF7562 (formed ca. 4400 BC, TMRCA ca. 3400 BC), prevalent among modern Albanians, expanded with Yamna migrants, or if it was part of an earlier expansion of R1b-M269 into the Balkans, and represent thus Indo-Anatolian speakers who later hitchhiked the expansion of the Late PIE language from the north or west Pontic area. The early TMRCA seems to suggest an association with Repin (and therefore Yamna), rather than later movements in the Balkans.
‘Yamnaya’ or ‘steppe’ ancestry?
After the early years when population genetics relied mainly on modern Y-DNA haplogroups, geneticists and amateurs have been recently playing around with testing “ancestry percentages”, based on newly developed free statistical tools, which offer obviously just one among many types of data to achieve a proper interpretation of the past.
Today we have quite a lot Y-DNA haplogroups reported for ancient samples of more recent prehistoric periods, and they seem to offer (at least since the 2015 papers, but more evidently since the 2018 papers on Bell Beakers and Europeans, Corded Ware, or Fennoscandia among others) the most straightforward interpretation of all results published in population genomics research.
NOTE. The finding of a specific type of ancestry in one isolated 40,000-year-old sample from Tianyuan can offer very interesting information on potential population movements to the region. However, the identification of ethnolinguistic communities and their migrations among neighbouring groups in Neolithic or Bronze Age groups is evidently not that simple.
It is becoming more and more clear with each paper that the true “Yamnaya ancestry” – not the originally described one – was in fact associated with Indo-Europeans (see more on the very Yamnaya-like Yamna Hungary and early East Bell Beaker R1b samples, all of quite similar ancestry and PCA cluster before their further admixture with EEF- and CWC-like groups).
The so-called “steppe ancestry”, on the other hand, reflects the contribution of a Northern Caucasus-related ancestry to expanding Khvalynsk settlers, who spread through the steppes more than a thousand years before the expansion of Late Proto-Indo-Europeans with late Repin, and can thus be found among different groups related to the Pontic-Caspian steppes (see more on the emergence and evolution of “steppe ancestry”).
In fact, after the Yamna/Indo-European and Corded Ware/Uralic expansions, it is more likely to find “steppe ancestry” to the north and east in territories traditionally associated with Uralic languages, whereas to the south and west – i.e. in territories traditionally associated with Indo-European languages – it is more likely to find “EEF ancestry” with diminished “steppe ancestry”, among peoples patrilineally descended from Yamna settlers.
Y-DNA haplogroups, the only uniparental markers (see exceptions in mtDNA inheritance) – unlike ancestry percentages based on the comparison of a few samples and flawed study designs – do not admix, do not change, and therefore they do not lend themselves to infinite pet theories (see e.g. what David Reich has to say about R1b-P312 in Iberia directly derived from Yamna migrants in spite of their predominant EEF ancestry): their cultural continuity can only be challenged with carefully threaded linguistic, archaeological, and genetic data.
It is a great resource to learn Late Proto-Indo-European as a modern language, from the most basic level up to an intermediate level (estimated B1–B2, depending on one’s previous background in Indo-European and classical languages).
Instead of working on unending details and discussions of the language reconstruction, it takes Late Proto-Indo-European as a learned, modern language that can be used for communication, so that people not used to study with university manuals on comparative grammar can learn almost everything necessary about PIE in the most comfortable way.
A Guidebook for Modern Indo-European Explorers (Part I), by Fernando López-Menchero, is online! https://t.co/L82Zx75bAj It is a self-learning method of Late PIE as a modern language (A1 up to B1-B2 level), divided into fun lessons with key grammar and culture details. pic.twitter.com/rmWm2m3vfs
NOTE. Even though we help each other with our works, Fernando is not the least interested in genetics (the “steppe ancestry” or the “R1b–R1a” question, or any other issue involving population genomics), or even too much about archaeology or the homeland question (although he uses the mainstream view that Late Proto-Indo-Europeans expanded from Yamna). His only interest is language reconstruction, and I doubt you can find anything else in his works but pure love for linguistics, including this one.
I was starting to call his project of a self-learning method The Winds of Winter, seeing how it appeared to be always in the making, but never actually finished. It seems that the publication of this first part will make my revision of the Indo-European demic diffusion model become the true The Winds of Winter here, in this our common series of books on Late Proto-Indo-European and its dialects…
As you can see, I am publishing less and less in this blog lately, and it’s all just to be able to finish a revision in time (that is, before more new genetic research compels me to delay it again…). It is a very thorough revision, so those of you who liked it are not going to be disappointed.
I hoped to have it ready for mid-December, but, as it turns out, due to different unexpected delays, I am now more confident about a mid-January / February date, and that only if everything goes well.
Because, if YFull‘s (and Iain McDonald‘s) estimation of the split of R1b-L23 in L51 and Z2103 (ca. 4100 BC, TMRCA ca. 3700 BC) was wrong, by as much as the R1a-Z645 estimates proved wrong, and both subclades were older than expected, then maybe R1b-L51 was not part of the Yamna expansion, but rather part of an earlier expansion with Suvorovo-Novodanilovka into central Europe.
That is, R1b-L51 and R1b-Z2103 would have expanded wih Khvalynsk-Novodanilovka migrants, and they would have either disappeared among local populations, or settled and expanded with successful lineages in certain regions. I think this may give rise to two potential models.
A hidden group in the European east-central steppes?
Here is what Heyd (2011), for example, has to say about the effect of the Khvalynsk-Novodanilovka expansion in the 4th millennium BC, with the first Kurgan wave that shuttered the social, economic, and cultural foundations of south-eastern Europe (before the expansion of west Yamna migrants in the region):
As the Boleraz and Baden tumuli cases in Serbia and Hungary demonstrate, there are earlier, 4th millennium cal. B.C. round tumuli in the Carpathian basin. There are also earlier north-Pontic steppe populations who infiltrated similar environments west of the Black Sea prior to the rise of the Yamnaya culture. This situation can be traced back to the 2nd half of the 5th millennium cal. B.C. to a group of distinct burials, zoomorphic maceheads, long flint blades, triangular flint points, etc., summarized under the term Suvurovo-Novodanilovka (Govedarica 2004; Rassamakin 2004; Anthony 2007; Heyd forthcoming 2011). They also erected round personalized tumuli, though smaller in size and height, above inhumations of single individuals. Suvorovo and Casimcea are the key examples in the lower Danube region of Romania. In northeast Bulgaria, the primary grave of Polska Kosovo (ochre-stained supine extended body position: information communicated by S. Alexandrov) can also be seen as such, as should the Targovishte-“Gonova mogila” primary grave 1 in the Thracian plain with a burial arranged in a supine position with flexed legs, southeast-northwest orientated, and strewed with ochre (Kanchev 1991 , p. 56- 57; Ivanova Gaydarska 2007). In addition to the many copper and shell beads, the 17.4cm long obsidian blade is exceptional, which links this grave to the Csongrád-“Kettoshalom” grave in the south Hungarian plain (Ecsedy 1979). It also yielded an obsidian blade ( 13.2cm long) and copper, shell and limestone beads.
However, no traces of a tumulus have been recorded above the Kettoshalom tomb. Conventionally, it is dated to the Bodrogkeresztur-period in east Hungary, shortly after 4000 cal. B.C., which would correspond very well with the suggested Cernavodă I (or its less known cultural equivalent in the Thracian plain) attribution for the “Gonova mogila” grave, a cultural background to which the Csongrád grave should have also belonged. Bodrogkeresztur and Cernavodă I periods are not the only examples of 4th millennium cal. B.C. tumuli and burials displaying this steppe connection. Indeed we can find this early steppe impact throughout the 4th millennium cal. B.C. These include adscriptions to the Horodiștea II (Corlateni-Dealul Stadole, grave I: Burtanescu l 998, p. 37; Holbocai, grave 34: Coma 1998, p. 16); to Gordinești-Cernavodă 11 (Liești-Movila Arbănașu, grave 22: Brudiu 2000); to Gorodsk-Usatovo (Corlăteni Dealul Cetăţii, grave I: Comșa 1998, p. 17- 18, in Romania; Durankulak, grave 982: Vajsov 2002, in Bulgaria); and to Cernavodă III(Golyama Detelina, tum. 4: Leshtakov, Borisov 1995), and early (end of 4th millennium cal. B.C.) Ezero in Ovchartsi, primary grave (Kalchev 1994, p. 134-138) and Golyama Detelina, tum. 2 (Kanchev 1991) in Bulgaria. Also the Boleráz and Baden tumuli of Banjevac-Tolisavac and Mokrin in the south Carpathian basin account for this, since one should perhaps take into account primary grave 12 of the Sárrédtudavari-Orhalom tumulus in the Hungarian Alfold: a left-sided crouched juvenile ( 15- 17 y) individual in an oval, NW-SE orientated grave pit 14C dated to 3350-3100 cal. B.C. at 2 sigma (Dani, Ncpper 2006). Neither the burial custom (no ochre strewing or depositing a lump of ochre has been recorded), nor date account for its ascription to the Yamnaya!
All of these tumuli and burials demonstrate, though, that there is already a constant but perhaps low-level 4th millennium cal. B.C. steppe interaction, linking the regions of the north of the Black Sea with those of the west, and reaching deep into the Carpathian basin. This has to be acknowledged. even if these populations remain small, bounded to their steppe habitat with an economy adapted to this special environment, and are not always visible in the record. Indirect hints may help in seeing them, such as the frequent occurrence of horse bones, regarded as deriving from domesticated horses, in Hungarian Baden settlements (Bokonyi 1978; Benecke 1998), and in those of the south German Cham Culture (Matuschik 1999, p. 80-82) and the east German Bernburg Culture (Becker 1999; Benecke 1999). These occur, however, always in low numbers, perhaps not enough to maintain and regenerate a herd. Does this point us towards otherwise archaeologically hidden horsebreeders in the Carpathian basin, before the Yamnaya? In any case, I hope to make one case clear: these are by no means Yamnaya burials in the strict definition! Attribution to the Yamnaya in its strict definition applies.
Also, about the expansion of Yamna settlers along the steppes:
However, it should have been made clear by the distribution map of the Western Yamnaya that they were confining themselves solely to their own, well-known, steppe habitat and therefore not occupying, or pushing away and expelling, the locally settled farming societies. Also, living solely in the steppes requires another lifestyle, and quite different economic and social bases, most likely very different to the established farming societies. Although surely regarded as incoming strangers, they may therefore not have been seen as direct competitors. This argument can be further enforced when remembering that the lowlands and the steppes in the southeast of Europe had already been populated throughout the 4th millennium cal. B.C., as demonstrated above, by societies with a similar north-Pontic steppe origin and tradition, albeit in lower numbers. It is only for these groups that the Yamnaya may have become a threat, but their common origin and perhaps a similar economic/ social background with comparable lifestyles would surely have assisted to allow rapid assimilation. More important, though, is that farming societies in this region may therefore have been accustomed to dealing and interacting with different people and ethnic strangers for a long time. (…)
When assessing farming and steppe societies’ interaction from a general point of view, attitudes can diverge in three main directions:
the violent one; with raids, fights, struggles, warfare, suppression and finally the superiority and exploitation of the one over the other;
the peaceful one; with a continuous exchange of gifts, goods, work, information and genes in a balanced reciprocal system, leading eventually to the merging of the two societies and creation of a new identity;
the neutral one; with the two societies ignoring each other for a long time.
What we see from trying to understand the record of the Yamnaya, based on their tumuli and burials, and the local and neighbouring contemporary societies, based on their settlements, hoards, and graves, is likely a mixture of all three scenarios, with the balance perhaps more towards exchange in a highly dynamic system with alterations over time. However, violence and raids cannot be ruled out; they would be difficult to see in the archaeological record; or only indirectly, such as the building of hill forts, particularly the defence-like chain of Vucedol hillforts along the south shore of the Danube on the Serbian/Croatian border zone (Tasic 1995a), and the retreat of people into them (Falkenstein 1998, p. 261-262), with other interpretations also possible. And finally, we are dealing here with very different local and neighbouring societies, as well as with more distant contemporary ones, looking, in reality, rather like a chequer board of societies and archaeological cultures (see Parzinger 1993 for the overview). These display different regional backgrounds and traditions leading to different social and settlement organizations, different economic bases and material cultures in the wide areas between Prut and Maritza rivers, and Black Sea and Tisza river. They surely found their individual way of responding to the incoming and settling Yamnaya people.
The best data we have about this potential non-Yamna origin of R1b-L51 – and thus in favour of its admixture in the Carpathian basin – lies in:
The majority of R1a-Z2103 subclades found to date among Yamna samples.
The limited presence of (ancient and modern) R1b-L51 in eastern Europe and India, whose isolated finds are commonly (and simplistically) attributed to ‘late migrations’.
The presence of R1b-L51 (xZ2103) in cultures related to the ‘Yamna package’, but supposedly not to Yamna settlers. So for example I7043, of haplogroup R1b-L151(xU106,xP312), ca. 2500-2200 BC from Szigetszentmiklós-Üdülősor, probably from the Bell Beaker (Csepel group), but maybe from the early Nagýrev culture.
The expansion of its subclades apparently only from a single region, around the Carpathian basin, in contrast to R1b-Z2103.
The already ‘diluted’ steppe admixture found in the earliest samples with respect to Yamna, which points to the appearance after the Yamna admixture with the local population.
Ukrainian archaeologists (in contrast to their Russian colleagues) point to the relevance of North Pontic cultures like Kvitjana and Lower Mikhailovka in the development of Early Yamna in the west, and some eastern European researchers also believe in this similarity.
If R1b-Z2103 and R1b-L51 had expanded with Suvorovo-Novodanilovka migrants to the west, and had admixed later as Hungary_LCA-LBA-like peoples with Yamna migrants during the long-term contacts with other ‘kurganized cultures’ ca. 2900-2500 BC in the Great Hungarian Plains, it could explain some peculiar linguistic traits of North-West Indo-European, and also why R1b-Z2103 appears in cultures associated with this earlier ‘steppe influence’ (i.e. not directly related to Yamna) such as Vučedol (with a R1b-Z2103 sample, see below). That could also explain the presence of R1b-L151(xP312, xU106) in similar Balkan cultures, possibly not directly related to Yamna.
A hidden group among north or west Pontic Eneolithic steppe cultures?
The expansion of Khvalynsk as Novodanilovka into the North Pontic area happened through the south across the steppe, near the coast, with the forest-steppe region working as a clear natural border for this culture of likely horse-riding chieftains, whose economy was probably based on some rudimentary form of mobile pastoralism.
Although archaeologists are divided as to the origin of each individual Middle Eneolithic group near the Black Sea after the end of the Khvalynsk-Novodanilovka period, it seems more or less clear that steppe cultures like Cernavodă, Lower Mikhailovka, or Kvitjana are closer (or “more archaic”) in their steppe features, which connects them to Volga–Ural and Northern Caucasus cultures, like Northern Caucasus, Repin or Khvalynsk.
On the other hand, forest-steppe cultures like Dereivka (including Alexandria) show innovative traits and contacts with para- or sub-Neolithic cultures to the north, like Comb-Pit Ware groups, apart from corded decoration influenced by Trypillian groups to the west, especially in their later (‘Proto-Corded Ware‘) stage after ca. 3500 BC.
If Ukrainian researchers like Rassamakin are right, Early Yamna expanded not only from Repin settlers, but also from local steppe cultures adopting Repin traits to develop an Early Yamna culture, similar to how eastern (Volga–Ural groups) seem to have synchronously adopted Early Yamna without massive affluence of Repin settlements.
Furthermore, local traits develop in southern groups, like anthropomorphic stelae (shared with Kemi-Oba, direct heir of Lower Mikhailovka), and rich burials featuring wagons. These traits are seen in west Yamna settlers.
Problems of this model include:
On the North Pontic area – in contrast to the Volga–Ural region – , there was a clear “colonization” wave of Repin settlers, also supported by Ukrainian researchers, based on the number of new settlements and burials, and on the progressive retreat of Dereivka, Kvitjana, as well as (more recent) Maykop- and Trypillia-related groups from the North Pontic area ca. 3350/3300 BC. It seems unlikely that these expansionist, semi-nomadic, cattle-breeding, patrilineally-related steppe clans that were driving all native populations out of their territories suddenly decided, at some point during their spread into the North Pontic area ca. 3300-3100 BC, to join forces with some foreign male lineages from the area, and then continue their expansion to the west…
Similar to the fate of R1b-P297 subclades in the Baltic after the expansion of Corded Ware migrants, previous haplogropus of the North Pontic region – such as R1a, R1b-V88, and I2 subclades basically disappeared from the ancient DNA record after the expansion of Khvalynsk-Novodanilovka, and then after the expansion of Yamna, as is clear from Yamna, Afanasevo, and Bell Beaker samples obtained to date. This, in combination with what we know about Y-chromosome bottlenecks in post-Neolithic expansions, leaves little space to think that a big enough territorial group with a majority of “native” haplogroups could survive later expansions (be it R1b-L51 or R1a-Z645).
Supporting an expansion of the same male (and partly female) population, the Yamna admixture from east to west is quite homogeneous, with the only difference found in (non-significant) EEF-like proportion which becomes elevated in distant areas [apart from significant ‘southern’ contribution to certain outlier samples]. Based on the also homogeneous Y-DNA picture, the heterogeneity must come, in general, from the female exogamy practiced by expanding groups.
There is a short period, spanning some centuries (approximately 3300-2700 BC), in which the North Pontic area – especially the forest-steppe territories to the west of the Dnieper, i.e. the Upper Dniester, Boh, and Prut-Siret areas – are a chaos of incoming and emigrating, expanding and shrinking groups of different cultures, such as late Trypillian groups, Maykop-related traits, TRB, GAC, (Proto-)Corded Ware, and Early Yamna settlements. No natural geographic frontier can be delimited between these groups, which probably interacted in different ways. Nevertheless, based on their cultural traits, admixture, and especially on their Y-DNA, it seems that they never incorporated foreign male lineages, beyond those they probably had during their initial expansion trends.
The further expansionist waves of Early Yamna seen ca. 3100 BC, from the Danube Delta to the west, give an overall image of continuously expanding patrilineal clans of R1b-M269 subclades since the Khvalynsk-Novodanilovka migration, in different periodic steps, mostly from eastern Pontic-Caspian nuclei, usually overriding all encountered cultures and (especially male) populations, rather than showing long-term collaboration and interaction. Such interaction is seen only in exceptional cases, e.g. the long-term admixture between Abashevo and Poltavka, as seen in Proto-Indo-Iranian peoples and their language.
We are living right now an exemplary ego-, (ethno-)nationalism-, and/or supremacy-deflating moment, for some individuals of eastern and northern European descent who believed that R1a or ‘steppe ancestry proportions’ meant something special. The same can be said about those who had interiorized some social or ethnolinguistic meaning for the origin of R1b in western Europe, N1c in north-eastern Europe, as well as Greeks, Iranians, Armenians, or Mediterranean peoples in general of ‘Near Eastern’ ancestry or haplogroups, or peoples of Near Eastern origin and/or language.
These people had linked their haplogroups or ancestry with some fantasy continuity of ‘their’ ancestral populations to ‘their’ territories or languages (or both), and all are being proven wrong.
Apart from teaching such people a lesson about what simplistic views are useful for – whether it is based on ABO or RH group, white skin, blond hair, blue eyes, lactase persistence, or on the own ancestry or Y-DNA haplogroup -, it teaches the rest of us what can happen in the near future among western Europeans. Because, until recently, most western Europeans were comfortably settled thinking that our ancestors were some remnant population from an older, Palaeolithic or Mesolithic population, who acquired Indo-European languages by way of cultural diffusion in different periods, including only minor migrations.
Judging by what we can see now among some individuals of Northern and Eastern European descent, the only thing that can worsen the air of superiority among western Europeans is when they realize (within a few years, when all these stupid battles to control the narrative fade) that not only are they the cultural ‘heirs’ of the Graeco-Roman tradition that began with the Roman Empire, but that most of them are the direct patrilineal descendants of Khvalynsk, Yamna, Bell Beaker, and European Bronze Age peoples, and thus direct descendants of Middle PIE, Late PIE, and NWIE speakers.
The finding of R1b-L51 and R1b-Z2103 among expanding Suvorovo-Novodanilovka chieftains, with pockets of R1b-L51 remaining in steppe-like societies of the Balkans and the Carpathian Basin, would have beautifully complemented what we know about the East Yamna admixture with R1a-Z93 subclades (Uralic speakers) ca. 2600-2100 BC to form Proto-Indo-Iranian, and about the regional admixtures seen in the Balkans, e.g. in Proto-Greeks, with the prevalent J subclades of the region.
It would have meant an end to any modern culture or nation identifying themselves with the ‘true’ Late PIE and Yamna heirs, because these would be exclusively associated with the expansion of R1b-Z2103 subclades with late Repin, and later as the full-fledged Late PIE with Yamna settlers to south-east and central Europe, and to the southern Urals. The language would have had then obviously undergone different language changes in all these territories through long-lasting admixture with other populations. In that sense, it would have ended with the ideas of supremacy in western Europe before they even begin.
The most likely future
However limited the evidence, it seems that R1b-L51 expanded with Yamna, though, based on the estimates for the haplogroups involved, and on marginal hints at the variability of L23 subclades within Yamna and neighbouring populations. If R1b-L51 expanded with West Repin / Early Yamna settlers, this is why they have not yet been found among Yamna samples:
The subclade division of Yamna settlers needs not be 50:50 for L51:Z2103, either in time or in space. I think this is the simplistic view underlying many thoughts on this matter. Many different expanding patrilineal clans of L23 subclades may have been more or less successful in different areas, and non-Z2103 may have been on the minority, or more isolated relative to Z2103-clans among expanding peoples on the steppe, especially on the east. In fact, we usually talk in terms of “Z2103 vs. L51” as if
these two were the only L23 subclades; and
both had split and succeeded (expanding) synchronously;
that is, as if there had not been multiple subclades of both haplogroups, and as if there had not been different expansion waves for hundreds of years stemming from different evolving nuclei, involving each time only limited (successful) clans. Many different subclades of haplogroups L23 (xZ2103, xL51), Z2103, and L51 must have been unsuccessful during the ca. 1,500 years of late Khvalynsk and late Repin-Early Yamna expansions in which they must have participated (for approximately 60-75 generations, based on a mean 20-25 years).
If we want to imagine a pocket of ‘hidden’ L51 for some region of the North Pontic or Carpathian region, the same can be imagined – and much more likely – for any unsampled territory of expanding late Repin/Early Yamna settlers from the Lower Don – Lower Volga region (probably already a mixed society of L51 and Z2103 subclades since their beginning, as the early Repin culture, ca. 3800 BC), with L51 clans being probably successful to the west.
The Repin culture expanded only in small, mobile settlements from the Lower Don – Lower Volga to the north, east, and south, starting ca. 3500/3400 BC, in the waves that eventually gave a rather early distant offshoot in the Altai region, i.e. Afanasevo. Starting ca. 3300 BC in the archaeological record, the majority of R1b-Z2103 subclades found to date in Afanasevo also supports either
a mixed Repin society, with Z2103-clans predominating among eastern settlers; or
a Repin society marked by haplogroup L51, and thus a cultural diffusion of late Repin/Early Yamna traits among neighbouring (Khvalynsk, Samara, etc.) groups of essentially the same (early Khvalynsk-Novodanilovka) genetic stock in the Volga–Ural region.
Both options could justify a majority of Z2103 in the Lower Volga–Ural region, with the latter being supported by the scattered archaeological remains of late Repin in the region before the synchronous emergence of Early Yamna findings in the whole Pontic-Caspian steppe.
Most Z2103 from Yamna samples to date are from around 3100 BC (in average) onward, and from the right bank of the Lower Don to the east, particularly from the Lower Volga–Ural area (especially the Samara region), which – based on the center of expansion of late Repin settlers – may be depicting an artificially high Z2103-distribution of the whole Yamna community.
Yamna sample I0443, R1b-L23 (Y410+, L51-), ca. 3300-2700 BCE from Lopatino II, points to an intermediate subclade between L23 and L51, near one of the supposed late Repin sites (based on kurgan burials with late Repin cultural traits) in the Samara region.
Other Balkan cultures potentially unrelated to the Yamna expansion also show Z2103 (and not only L51) subclades, like I3499 (ca. 2884-2666 calBC), of the Vučedol culture, from Beli Manastir-Popova zemlja, which points to the infiltration of Yamna peoples in other cultures. In any case, the appearance of R1b-L23 subclades in the region happens only after the Yamna expansion ca. 3100 BC, probably through intrusions into different neighbouring regions, if these Balkan cultures are not directly derived from Yamna settlements (which is probably the case of the Csepel Bell Beaker or early Nagýrev sample, see above).
The diversity of haplogroups found in or around the Carpathian Basin in Late Chalcolithic / Early Bronze Age samples, including L151(xP312, xU106), P312, U106, Z2103, makes it the most likely sink of Yamna settlers, who spread thus with expanding family clans of different R1b-L23 subclades.
Even though some Yamna vanguard groups are known to have expanded up to Saxony-Anhalt before ca. 2700 BC, haplogroup Z2103 seems to be restricted to more eastern regions, which suggests that R1b-L51 was already successful among expanding West Yamna clans in Hungary, which gave rise only later to expanding East Bell Beakers (overwhelmingly of L151 subclades). The source of R1b-L51 and L151 expansion over Z2103 must lie therefore in the West Yamna period, and not in the Bell Beaker expansion.
The R1b-Z2103 found in Poltavka, Catacomb, and to the south point to a late migration displacing the western R1b-L51, only after the late Repin expansion. This is also seen in the steppe ancestry and R1b-Z2103 south of the Caucasus, in Hajji Firuz, which points to this route as a potential source of the supposed “Earliest Proto-Indo-Iranian” (the mariannu term) of the Near East. A similar replacement event happened some centuries later with expanding R1a-Z93 subclades from the east wiping out haplogroup R1b-Z2103 from the Pontic-Caspian steppe.
Many ancient samples from Khvalynsk, Northern Caucasus, Yamna, or later ones are reported simply as R1b-M269 or L23, without a clear subclade, so the simplistic ‘Yamna–Z2103’ picture is not real: if one takes into account that Z2103 might have been successful quite early in the eastern region, it is more likely to obtain a successful Y-SNP call of a Z2103 subclade in the Volga–Ural region than a xZ2103 one.
‘Western’ features described by archaeologists for West Yamna settlers, associated with Kemi Oba and southern Yamna groups in the North Pontic area – like rich burials with anthropomorphic stelae and wagons – are actually absent in burials from settlers beyond Bulgaria, which does not support their affiliation with these local steppe groups of the Black Sea. Also, a mix with local traditions is seen accross all Early Yamna groups of the Pontic-Caspian steppe, and still genetics and common cultural traits point to their homogeneization under the same patrilineal clans expanding continuously for centuries. The maintenance of local traditions (as evidenced by East Bell Beakers in Iberia related to Iberian Proto-Beakers) is often not a useful argument in genetics, especially when the female population is not replaced.
Middle Proto-Indo-European expanded with Khvalynsk-Novodanilovka after ca. 4800 BC, with the first Suvorovo settlements dated ca. 4600 BC.
Archaic Late Proto-Indo-European expanded with late Repin (or Volga–Ural settlers related to Khvalynsk, influenced by the Repin expansion) into Afanasevo ca. 3500/3400 BC.
Late Proto-Indo-European expanded with Early Yamna settlers to the west into central Europe and the Balkans ca. 3100 BC; and also to the east (as Pre-Proto-Indo-Iranian) into the southern Urals ca. 2600 BC.
North-West Indo-European expanded with Yamna Hungary -> East Bell Beakers, from ca. 2500 BC.
Proto-Indo-Iranian expanded with Sintashta, Potapovka, and later Andronovo and Srubna from ca. 2100 BC.
It seems that the subclades from Khvalynsk ca. 4250-4000 BC were wrongly reported – like those of Narasimhan et al. (2018). However, even if they are real and YFull estimates have to be revised, and even if the split had happened before the expansion of Suvorovo-Novodanilovka, the most likely origin of R1b-L51 among Bell Beakers will still be the expansion of late Repin / Early Yamna settlers, and that is what ancient DNA samples will most likely show, whatever the social or political consequences.
The only relevance of the finding of R1b-L51 in one place or another – especially if it is found to be a remnant of a Middle PIE expansion coupled with centuries of admixture and interaction in the Carpathian Basin – is the potential influence of an archaic PIE (or non-IE) layer on the development of North-West Indo-European in Yamna Hungary -> East Bell Beaker. That is, more or less like the Uralic influence related to the appearance of R1a-Z93 among Proto-Indo-Iranians, of R1a-Z284 among Pre-Germanic peoples, and of R1a-Z282 among Balto-Slavic peoples.
I think there is little that ancient DNA samples from West Yamna could add to what we know in general terms of archaeology or linguistics at this point regarding Late PIE migrations, beyond many interesting details. I am sure that those who have not attributed some random 6,000-year-old paternal ancestor any magical (ethnic or nationalist) meaning are just having fun, enjoying more and more the precise data we have now on European prehistoric populations.
As for those who believe in magical consequences of genetic studies, I don’t think there is anything for them to this quest beyond the artificially created grand-daddy issues. And, funnily enough, those who played (and play) the ‘neutrality’ card to feel superior in front of others – the “I only care about the truth”-type of lie, while secretly longing for grandpa’s ethnolinguistic continuity – are suffering the hardest fall.
Article of general knowledge in Der Spiegel, Invasion from the Steppe, with comments from Willerslev and Kristiansen, appeared roughly at the same time as the Damgaard et al. Nature (2018) and Science (2018) papers were published.
Particularly striking is the genetic signature from the steppe on the Y chromosome. From this the researchers conclude that the majority of migrants were males. Kristian Kristiansen, chief archaeologist in the Willerslev team, also has an idea of how this could be explained: “Maybe it’s a rite of initiation, as it was spread among the steppe peoples,” he says.
The younger sons of the Yamnaya herders, who were excluded from the succession, had to seek their fortune on their own. As part of a solemn ritual, they threw themselves to wolves’ skins and then swarmed in warlike gangs to buy their own herds by cattle-stealing.
An ally that they seem to have brought from their homeland may also have contributed to the genetic success of the steppe people: Yersinia pestis, the plague bacterium. Its genes were found by researchers from the Max Planck Institute in Jena – and apparently it emerged exactly at the same time as the Yamnaya thrust began.
About the Hittites
(…) And yet now, where Asia and Europe meet geographically, there is no trace of the Yamnaya genes. The wander-loving people from the Pontic-Caspian steppe apparently found neither the way across the Balkans nor through the Caucasus mountains.
Now the researchers are puzzled: How can it be that a language goes on a walk, without the accompanying speakers coming along? Is it possible that the Indo-European seeped into Anatolia, much like the English language spread today without the need for Englishmen?
Archaeologist Kristiansen does not believe it. The researchers would find it hard to reconsider their theories, he says: “Especially the first chapter of the story has to be rewritten.”
He suspects that there was a predecessor of the Yamnaya culture, in which a kind of Proto-Proto-Indo-European was spoken. And he also has a suspicion, where this people could have drifted around: The Caucasus, says Kristiansen, was their homeland. But that remains unproven: “There’s another hole left,” he admits.
About the Botai
The study of [the Botai] genome revealed that it was genetically radically different from the members of the Yamnaya culture. The Botai, it seems, consistently avoided any contact with their neighbors – even though they must have crossed the territory of the Botai on their migratory waves.
Willerslev assumes that the art of keeping horses from the Yamnaya steppe nomads was adopted from these peoples, and then they developed it further. At some point, the Botai could then have itself become doomed by its groundbreaking innovation: While the descendants of the Yamnaya spread over half of Eurasia, the Botai disappeared without leaving a trace.
Even more interesting than the few words that set the Copenhagen group’s views for future papers (such as the expected Maykop samples with EHG ancestry) is the artistic sketch of the Indo-European migrations, probably advised by the group.
A simple map does not mean that all members of the Danish workgroup have changed their view completely, but I would say it is a great improvement over the previous “arrows of migration” (see here), and it is especially important that they show a more realistic picture of ancient migrations to general readers.
NOTE. Especially absurd is the identification of the ‘Celtic’ expansion with the first Bell Beakers in the British Isles (that idea is hold by few, such as Koch and Cunliffe in their “Celtic from the West” series). Also inexact, but not so worrying, are the identification of ‘Germanic’ in Germany/Únětice, or the spread of ‘Baltic’ and ‘Slavic’ directly to East Europe (i.e. I guess Mierzanowice/Nitra -> Trzciniec), which is probably driven by the need to assert a close connection with early Iranians and thus with their satemization trends.
Their results, as well as those of the competition labs at Harvard University and Jena’s Max Planck Institute for the History of Humanity, leave no doubt: Yes, the legendary herdsmen in the Pontic-Caspian steppe really existed. They belonged to the so-called Yamnaya culture, and they spread, as linguists had predicted, in massive migrations towards Central Europe and India – a later triumph for linguists.
The project has been an extremely enriching and exciting process. We were able to direct many very different academic fields towards a single coherent approach. By asking the right questions, and keeping limitations of the data in mind, contextualizing, nuancing, and keeping dialogues open between scholars of radically different backgrounds and approaches, we have carved out a path for a new field of research. We have already seen too many papers come out in which models produced by geneticists working on their own have been accepted without vital input from other fields, and, at the other extreme, seen archaeologists opposing new studies built on archaeogenetic data, due to a lack of transparency between the fields.
Data on ancient DNA is astonishing for its ability to provide a fine-grained image of early human mobility, but it does stand on the shoulders of decades of work by scholars in other fields, from the time of excavation of human skeletons to interpreting the cultural, linguistic origins of the samples. This is how cold statistics are turned into history.
This is part I of two posts on the most recent data concerning the earliest known Indo-European migrations.
Anatolian in Armi
I am reading in forums about “Kroonen’s proposal” of Anatolian in the 3rd millennium. That is false. The Copenhagen group (in particular the authors of the linguistic supplement, Kroonen, Barjamovic, and Peyrot) are merely referencing Archi (2011. “In Search of Armi”. Journal of Cuneiform Studies 63: 5–34) in turn using transcriptions from Bonechi (1990. “Aleppo in età arcaica; a proposito di un’opera recente”. Studi Epigrafici e Linguistici sul Vicino Oriente Antico 7: 15–37.), who asserted the potential Anatolian origin of the terms. This is what Archi had to say about this:
Most of these personal names belong to a name-giving tradition different from that of Ebla; Arra-ti/tulu(m) is attested also at Dulu, a neighbouring city-state (Bonechi 1990b: 22–25).28 We must, therefore, deduce that Armi belonged to a marginal, partially Semitized linguistic area different from the ethno-linguistic region dominated by Ebla. Typical are masculine personal names ending in -a-du: A-la/li-wa-du/da, A-li/lu-wa-du, Ba-mi-a-du, La-wadu, Mi-mi-a-du, Mu-lu-wa-du. This reminds one of the suffix -(a)nda, -(a)ndu, very productive in the Anatolian branch of Indo-European (Laroche 1966: 329). Elements such as ali-, alali-, lawadu-, memi-, mula/i- are attested in Anatolian personal names of the Old Assyrian period (Laroche 1966: 26–27, 106, 118, 120).
This was used by Archi to speculatively locate the state of Armi, in or near Ebla territory, which could correspond with the region of modern north-western Syria:
The onomastic tradition of Armi, so different from that of Ebla and her allies (§ 5), obliges us to locate this city on the edges of the Semitized area and, thus, necessarily north of the line running through Hassuwan – Ursaum – Irritum – Harran. If Armi were to be found at Banat-Bazi, it would have represented an anomaly within an otherwise homogenous linguistic scenario.34
Taken as a whole, the available information suggests that Armi was a regional state, which enjoyed a privileged relationship with Ebla: the exchange of goods between the two cities was comparable only to that between Ebla and Mari. No other state sent so many people to Ebla, especially merchants, lú-kar. It is only a hypothesis that Armi was the go-between for Ebla and for the areas where silver and copper were extracted.
This proposal is similar to the one used to support Indo-Aryan terminology in Mittanni (ca. 16th-14th c. BC), so the scarce material should not pose a problem to those previously arguing about the ‘oldest’ nature of Indo-Aryan.
NOTE. On the other hand, the theory connecting ‘mariannu‘, a term dated to 1761 BC (referenced also in the linguistic supplement), and put in relation with PIIr. *arya–, seems too hypothetical for the moment, although there is a clear expansion of Aryan-related terms in the Middle East that could support one or more relevant eastern migration waves of Indo-Aryans from Asia.
Potential routes of Anatolian migration
Once we have accepted that Anatolian is not Late PIE – and that only needed a study of Anatolian archaisms, not the terminology from Armi – , we can move on to explore the potential routes of expansion.
On the Balkan route
A current sketch of the dots connecting Khvalynsk with Anatolia is as follows.
Then we have Cernavoda I (ca. 3850-3550 BC), a culture potentially derived from the earlier expansion of Suvorovo chiefs, as shown in cultural similarities with preceding cultures and Yamna, and also in the contacts with the North Pontic steppe cultures (read a a recent detailed post on this question).
We also have proof of genetic inflow from the steppe into populations of cultures near those suggested to be heirs of those dominated by Suvorovo chiefs, from the 5th millennium BC (in Varna I ca. 4630 BC, and Smyadovo ca. 4500 BC, see image below).
If these neighbouring Balkan peoples of ca. 4500 BC are taken as proxies for Proto-Anatolians, then it becomes quite clear why Old Hittite samples dated 3,000 years after this migration event of elite chiefs could show no or almost no ancestry from Europe (for this question, read my revision of Lazaridis’ preprint).
NOTE. A full account of the crisis in the lower Danube, as well as the Suvorovo-Novodanilovka intrusion, is available in Anthony (2007).
The southern Balkans and Anatolia
The later connection of Cernavoda II-III and related cultures (and potentially Ezero) with Troy, on the other hand, is still blurry. But, even if a massive migration of Common Anatolian is found to happen from the Balkans into Anatolia in the late 4th / beginning of the 3rd millennium, the people responsible for this expansion could show a minimal trace of European ancestry.
Earlier third millennium cal BCE is the period of development of interconnected Early Bronze Age societies in Eurasia, which economic and social structures expressed variants of pre-state political structures, named in the specialized literature tribes and chiefdoms. In this work new arguments will be added to the chiefdom model of third millennium cal BC societies of Yunatsite culture in the Central Balkans from the perspectives of the interrelations between Dubene (south central Bulgaria) and Troy (northwest Turkey) wealth expression.
Possible explanations of the similarity in the wealth expression between Troy and Yunatsite chiefdoms is the direct interaction between the political elite. However, the golden and silver objects in the third millennium cal BCE in the Eastern Mediterranean are most of all an expression of economic wealth. This is the biggest difference between the early state and chiefdoms in the third millennium cal BCE in Eurasia and Africa. The literacy and the wealth expression in the early states was politically centralized, while the absence of literacy and wider distribution of the wealth expression in the chiefdoms of the eastern Mediterranean are indicators, that wider distribution of wealth and the existed stable subsistence layers prevented the formation of states and the need to regulate the political systems through literacy.
The only way to link Common Anatolians to their Proto-Anatolian (linguistic) ancestors would therefore be to study preceding cultures and their expansions, until a proper connecting route is found, as I said recently.
These late commercial contacts in the south-eastern Balkans (Nikolova also offers a simplified presentation of data, in English) are yet another proof of how Common Anatolian languages may have further expanded into Anatolia.
NOTE. One should also take into account the distribution of modern R1b-M269* and L23* subclades (i.e. those not belonging to the most common subclades expanding with Yamna), which seem to peak around the Balkans. While those may just belong to founder effects of populations preceding Suvorovo or related to Yamna migrants, the Balkans is a region known to have retained Y-DNA haplogroup diversity, in contrast with other European regions.
On a purely linguistic aspect, there are strong Hattic and Hurrian influences on Anatolian languages, representing a unique layer that clearly differentiates them from LPIE languages, pointing also to different substrates behind each attested Common Anatolian branch or individual language:
Phonetic changes, like the appearance of /f/ and /v/.
Split ergativity: Hurrian is ergative, Hattic probably too.
Increasing use of enclitic pronoun and particle chains after first stressed word: in Hattic after verb, in Hurrian after nominal forms.
Almost obligatory use of clause initial and enclitic connectors: e.g. semantic and syntactic identity of Hattic pala/bala and Hittite nu.
It seems that the Danish group is now taking a stance in favour of a Maykop route (from the linguistic supplement):
The period of Proto-Anatolian linguistic unity can now be placed in the 4th millennium BCE and may have been contemporaneous with e.g. the Maykop culture (3700–3000 BCE), which influenced the formation and apparent westward migration of the Yamnaya and maintained commercial and cultural contact with the Anatolian highlands (Kristiansen et al. 2018).
In fact, they have data to support this:
The EHG ancestry detected in individuals associated with both Yamnaya (3000–2400 BCE) and the Maykop culture (3700–3000 BCE) (in prep.) is absent from our Anatolian specimens, suggesting that neither archaeological horizon constitutes a suitable candidate for a “homeland” or “stepping stone” for the origin or spread of Anatolian Indo- European speakers to Anatolia. However, with the archaeological and genetic data presented here, we cannot reject a continuous small-scale influx of mixed groups from the direction of the Caucasus during the Chalcolithic period of the 4th millennium BCE.
It will not be surprising to find not only EHG, but also R1b-L23 subclades there. In my opinion, though, the most likely source of EHG ancestry in Maykop (given the different culture shown in other steppe groups) is exogamy.
The question will still remain: was this a Proto-Anatolian-speaking group?
My opinion in this regard – again, without access to the study – is that you would still need to propose:
A break-up of Anatolian ca. 4500 BC represented by some early group migrating into the Northern Caucasus area.
For this group – who were closely related linguistically and culturally to early Khvalynsk – to remain isolated in or around the Northern Caucasus, i.e. somehow ‘hidden’ from the evolving LPIE speakers in late Khvalynsk/early Yamna peoples.
Then appear as Old Hittites without showing EHG ancestry (even though they show it in the period 3700-3000 BC), near the region of the Armi state, where Anatolian was supposedly spoken already in the mid-3rd millennium.
Not a very convincing picture, right now, but indeed possible.
Also, we have R1b-Z2103 lineages and clear steppe ancestry in the region probably ca. 2500 BC with Hajji Firuz, which is most likely the product of the late Khvalynsk migration waves that we are seeing in the recent papers.
These migrations are then related to early LPIE-speaking migrants spreading after ca. 3300 BC – that also caused the formation of early Yamna and the expansion of Tocharian-related migrants – , which leaves almost no space for an Anatolian expansion, unless one supports that the former drove the latter.
NOTE. In any case, if the Caucasus route turned out to be the actual Anatolian route, I guess this would be a way as good as any other to finally kill their Indo-European – Corded Ware theory, for obvious reasons.
On the North Iranian homeland
A few thoughts for those equating CHG ancestry in IE speakers (and especially now in Old Hittites) with an origin in North Iran, due to a recent comment by David Reich:
In the paper it is clearly stated that there is no Neolithic Iranian ancestry in the Old Hittite samples.
Ancestry is not people, and it is certainly not language. The addition of CHG ancestry to the Eneolithic steppe need not mean a population or linguistic replacement. Although it could have been. But this has to be demonstrated with solid anthropological models.
NOTE. On the other hand, if you find people who considered (at least until de Barros Damgaard et al. 2018) steppe (ancestry/PCA) = Indo-European, then you should probably confront them about why CHG in Hittites and the arrival of CHG in steppe groups is now not to be considered the same, i.e why CHG / Iran_N ≠ PIE.
Since there has been no serious North Iranian homeland proposal made for a while, it is difficult to delineate a modern sketch, and I won’t spend the time with that unless there is some real anthropological model and genetic proof of it. I guess the Armenian homeland hypothesis proposed by Gamkrelidze and Ivanov (1995) would do, but since it relies on outdated data (some of which appears also in Gimbutas’ writings), it would need a full revision.
NOTE. Their theory of glottalic consonants (or ejectives) relied on the ‘archaism’ of Hittite, Germanic, and Armenian. As you can see (unless you live in the mid-20th century) this is not very reasonable, since Hittite is attested quite late and after heavy admixture with Middle Eastern peoples, and Germanic and Armenian are some of the latest attested (and more admixed, phonetically changed) languages.
This would be a proper answer, indeed, for those who would accept this homeland due to the reconstruction of ‘ejectives’ for these languages. Evidently, there is no need to posit a homeland near Armenia to propose a glottalic theory. Kortlandt is a proponent of a late and small expansion of Late PIE from the steppe, and still proposes a reconstruction of ejectives for PIE. But, this was the main reason of Gamkrelidze and Ivanov to propose that homeland, and in that sense it is obviously flawed.
Those claiming a relationship of the North Iranian homeland with such EHG ancestry in Maykop, or with the hypothetic Proto-Euphratic or Gutian, are obviously not understanding the implications of finding steppe ancestry coupled with (likely) early Late PIE migrants in the region in the mid-4th millennium.
A lot of interesting data, I will try to analyse its main implications, if only superficially, in sections.
Anatolia_EBA from Ovaören, and Anatolia_MLBA (this including Assyrian and Old Hittite samples), all from Kalehöyük, show almost no change in Y-DNA lineages (three samples J2a, one G2a), and therefore an origin of these people in common with CHG and Iranian Neolithic populations is likely. No EHG ancestry is found. And PCA cluster is just somehow closer to Europe, but not to EHG populations.
NOTE. Hittite is attested only in the late first half of the 2nd millennium, although the authors cite (in the linguistic supplement) potential evidence from the palatial archives of the ancient city of Ebla in Syria to argue that Indo-European languages may have been already spoken in the region in the late 3rd millennium BCE.
Regarding the Assyrian samples (one J2a) from Ovaören:
Layer V of GT-137 was the richest in terms of architectural finds and dates to the Early Bronze Age II. In this layer, 2 different structures and a well were uncovered. The well was filled with stones, pottery, and human skeletons (Figs. S2 and S3). In total, skeletons belonging to 22 individuals, including adults, young adults, and children, must belong to the disturbed Early Bronze Age II graves adjacent to the well (103). Pottery and stones found below the skeletons demonstrate that the water well was consciously filled and closed. The fill consists of dumped stones, sherds and skeletons, and the closing stones demonstrate that the water well was consciously filled and cancelled.
Regarding the site most likely associated with the emergence of Old Hittite (two samples J2a1, one G2a2b1), this is what we know:
The Middle Bronze Age at Kaman-Kalehöyük represented by stratum IIIc yields material remains (seals and ceramics) contemporary with the international trade system managed by expatriate Assyrian merchants evidenced at the nearby site of Kültepe/Kanesh. It is therefore also referred to as belonging to the “Assyrian Colony Period” (98). The stratum has revealed three burned architectural units, and it has been suggested that the seemingly site-wide conflagration might be connected to a destruction event linked with the emergence of the Old Hittite state (99). (…) Omura (100) suggests that the rooms could belong to a public building, and that it might even be a small trade center based on the types of artifacts recovered. Omura (100) has concluded that the evidence from the first complex indicates a battle between 2 groups took place at the site. It is possible that a group died inside the buildings, mostly perishing in the fire, while another group died in the courtyard.
The PCA (Fig. 2B) indicates that all the Anatolian genome sequences from the Early Bronze Age ( -2200 BCE) and Late Bronze Age (-1600 BCE) cluster with a previously sequenced Copper Age ( -3900- 3700 BCE) individual from Northwestern Anatolia and lie between Anatolian Neolithic (Anatolia_ N) samples and CHG samples but not between Anatolia_N and EHG samples.
(…) we are not able to reject a two-population qpAdm model in which these groups derive -60% of their ancestry from Anatolian farmers and -40% from CHG-related ancestry (p-value = 0.5). This signal is not driven by Neolithic Iranian ancestry.
NOTE. Anatolian Iron Age samples, from the Hellenistic period, which was obviously greatly influenced by different, later Indo-European migrations, does show a change in PCA.
Regarding CHG ancestry:
Ancient DNA findings suggest extensive population contact between the Caucasus and the steppe during the Copper Age (-5000-3000 BCE) (1, 2, 42). Particularly, the first identified presence of Caucasian genomic ancestry in steppe populations is through the Khvalynsk burials (2, 47) and that of steppe ancestry in the Caucasus is through Armenian Copper Age individuals (42). These admixture processes likely gave rise to the ancestry that later became typical of the Yamnaya pastoralists (7), whose IE language may have evolved under the influence of a Caucasian language, possibly ‘from the Maykop culture (50, 55). This scenario is consistent with both the “Copper Age steppe” (4) and the “Caucasian” models for the origin of the Proto-Anatolian language (56).
The CHG specific ancestry and the absence of EHG-related ancestry in Bronze Age Anatolia would be in accordance with intense cultural interactions between populations in the Caucasus and Anatolia observed during the late 5th millennium BCE that seem to come to an end in the first half of the 4th millennium BCE with the village-based egalitarian Kura-Araxes society (59, 60), thus preceding the emergence and dispersal of Proto-Anatolian.
Our results indicate that the early spread of IE languages into Anatolia was not associated with any large-scale steppe-related migration, as previously suggested (61). Additionally, and in agreement with the later historical record of the region (62), we find no correlation between genetic ancestry and exclusive ethnic or political identities among the populations of Bronze Age Central Anatolia, as has previously been hypothesized ( 63).
The Anatolian question
There is no steppe ancestry or R1b-M269 lineages near early historic Hittites. Yet.
Nevertheless, we already know about potentially similar cases:
N1c lineages and Siberian ancestry arrived late in North-East Europe, modifying the ancestry of North-East European groups – with each region showing its own different late waves of N lineages or Siberian ancestry. Even after the known bottlenecks and the subsequent expansion of recently arrived haplogroups and ancestry, there was not much cultural (or ethnolinguistic) impact.
So there seems to be thus no theoretical problem in accepting:
That neither steppe ancestry nor R1b-M269 subclades, already diminished in Bulgaria in the mid-5th millennium, did reach Anatolia, but only those Common Anatolian-speaking Aegean groups over whose ancestors Proto-Anatolians (marked by incoming EHG ancestry) would have previously dominated in the Balkans.
That steppe ancestry and R1b-M269 subclades did in fact arrive in the Aegean, but EHG was further diluted among the CHG-related population by the time of the historic Anatolian-speaking peoples in central Anatolia. Or, the most likely option, that their trace have not been yet found. Probably the western Luwian peoples, near Troy, were genetically closer to Common Anatolians.
What we can assert right now is that Proto-Anatolian must have separated quite early for this kind of data to show up. This should mean an end to the Late PIE origin of Anatolian, if there was some lost soul from the mid-20th century still rooting for this.
As I said in my review of Lazaridis’ latest preprint, we will have to wait for the appropriate potential routes of expansion of Proto-Anatolian to be investigated. As he answered, the lack of EHG poses a problem for steppe expansion into Anatolia, but there is still no better alternative model proposed.
This is what the authors have to say:
Our findings are thus consistent with historical models of cultural hybridity and “Middle Ground” in a multi-cultural and multi-lingual but genetically homogeneous Bronze Age Anatolia (68, 69). Current linguistic estimations converge on dating the Proto-Anatolian split from residual PIE to the late 5th or early 4th millennia BCE (58, 70) and place the breakup of Anatolian IE inside Turkey prior to the mid-3rd millennium (53, 71,72).
We cannot at this point reject a scenario in which the introduction of the Anatolian IE languages into Anatolia was coupled with the CHG-derived admixture prior to 3700 BCE, but note that this is contrary to the standard view that PIE arose in the steppe north of the Caucasus (4) and that CHG ancestry is also associated with several non-IE-speaking groups, historical and current. Indeed, our data are also consistent with the first speakers of Anatolian IE coming to the region by way of commercial contacts and small-scale movement during the Bronze Age. Among comparative linguists, a Balkan route for the introduction of Anatolian IE is generally considered more likely than a passage through the Caucasus, due, for example, to greater Anatolian IE presence and language diversity in the west (73). Further discussion of these options is given in the archaeological and linguistic supplementary discussions (48, 49).
If you are asking yourselves why the Danish school (of Allentoft, Kristiansen, and Kroonen, co-authors of this paper) was not so fast to explain the findings the same way the proposed their infamous Indo-European – steppe ancestry association (i.e. ancestry = language, ergoCHG = PIE in this case), and resorted to mainstream anthropological models instead to explain the incongruence, I can think of two main reasons:
The possibility of having an early PIE around the Caucasus, potentially closely related not only to Uralic to the north, but also to Caucasian languages, Sumerian, Afroasiatic, Elamo-Dravidian, etc. could be a good reason for those excited with these few samples to begin dealing with macro-language proposals, such as Eurasiatic and Nostratic. If demonstrated to be true, a Northern Iranian origin of Middle PIE would also help relieve a little bit the pressure that some are feeling about the potentially male-driven Indo-European continuity (even if not “autochthonous”) associated with the expansion of R1b-L23 subclades.
Interesting data from an early East Yamna offshoot at Karagash, ca. 3018-2887 BC, of R1b-Z2106 lineage, which shows some ancestry, lineage, and cultural continuity in Sholpan, ca. 2620-2468 BC, in Kazakhstan.
On the formation of Yamna and its CHG contribution, from the supplementary material:
An admixture event, where Yamnaya is formed from a CHG population related to KK1 [=Kotias, dated ca. 7800 BC] and an ANE population related to Sidelkino and Botai. We inferred 54% of the Yamnaya ancestry to come from CHG and the remaining 46% to come from ANE.
A split event, where the CHG component of Yamnaya splits from KK1. The model inferred this time at 27 kya (though we note the larger models in Sections S2.12.4 and S2.12.5 inferred a more recent split time [see below graphic]).
A split event, where the ANE component of Yamnaya splits from Sidelkino. This was inferred at about about 11 kya.
A split event, where the ANE component of Yamnaya splits from Botai. We inferred this to occur 17 kya. Note that this is above the Sidelkino split time, so our model infers Yamnaya to be more closely related to the EHG Sidelkino, as expected.
An ancestral split event between the CHG and ANE ancestral populations. This was inferred to occur around 40 kya.
On the expansion of domestication
CHG is not found in Botai, no gene flow from Yamna is found in its samples, and they are more related to East Asians, while Yamna is related to West Eurasians:
The lack of evidence of admixture between Botai horse herders and western steppe pastoralists is consistent with these latter migrating through the central steppe but not settling until they reached the Altai to the east (4). More significantly, this lack of admixture suggests that horses were domesticated by hunter-gatherers not previously familiar with farming, as were the cases for dogs (38) and reindeer (39). Domestication of the horse thus may best parallel that of the reindeer, a food animal that can be milked and ridden, which has been proposed to be domesticated by hunters via the “prey path” (40); indeed anthropologists note similarities in cosmological beliefs between hunters and reindeer herders (41). In contrast, most animal domestications were achieved by settled agriculturalists (5).
NOTE. I am not sure, but they seem to hint that there were separate events of horse domestication and horse-riding technique by the Botai and Yamna populations due to their lack of genetic contribution from the latter to the former. I guess they did not take into account farming spreading to the steppe without genetic contribution beyond the Dnieper… In fact, the superiority in horse-riding shown by the expanding Yamna peoples – as they state – should also serve to suggest from where the original technique expanded.
On the expansion of Yamna, and the different expansion of Steppe MLBA (with Indo-Iranian speakers) into Asia, further supporting Narasimhan et al. (2018), they have this to say:
However, direct influence of Yamnaya or related cultures of that period is not visible in the archaeological record, except perhaps for a single burial mound in Sarazm in present-day Tajikistan of contested age (44, 45). Additionally, linguistic reconstruction of proto-culture coupled with the archaeological chronology evidences a Late (-2300-1200 BCE) rather than Early Bronze Age (-3000-2500 BCE) arrival of the Indo-Iranian languages into South Asia (16, 45, 46). Thus, debate persists as to how and when Western Eurasian genetic signatures and IE languages reached South Asia.
Samples from the Namazga region (current Turkmenistan) from the Iron Age show an obvious influence from steppe MLBA (ca. 2300-1200 BC), and not steppe EBA (i.e. Yamna), population, in contrast with samples from the Chalcolithic (ca. 3300 BC), which don’t show this influence. This helps distinguish prior contacts with Iran Neolithic from the actual steppe population that expanded Indo-Iranian into Asia.
Very interesting therefore the Namazga CA sample (ca. 855 BC), of R1a-Z93 subclade, showing the sign of immigrant Indo-Aryans in the region. For more on this we will need an evaluation in common with the corrected data from Narasimhan et al. (2018), and all, including de Barros (Nature 2018), in combination with statistical methods to ascertain differences between early Indo-Aryans and Iranians.
Siberian peoples and N1c lineages
We have already seen how the paper on Eurasian steppe samples tries to assign Uralic to Neolithic peoples east of the Urals. The association with Okunevo is unlikely, since most are of haplogroup Q1a2, but they seem to suggest (combining both papers) that they accompanied N lineages from Siberian hunter-gatherers (present e.g. in Botai or Shamanka II, during the Early Neolithic), and formed part of (or suffered from) different demic diffusion waves:
These serial changes in the Baikal populations are reflected in Y-chromosome lineages (Fig. SA; figs. S24 to S27, and tables S13 and SI4). MAI carries the R haplogroup, whereas the majority of Baikal_EN males belong to N lineages, which were widely distributed across Northern Eurasia (29), and the Baikal_LNBA males all carry Q haplogroups, as do most of the Okunevo_EMBA as well as some present-day Central Asians and Siberians.
NOTE. Also interesting to see no R1a in Baikal hunter-gatherers after ca. 3500 BC, and a prevalence of N lineages as supported in a previous paper on the Kitoi culture, which some had questioned in the past.
In fact, the only N1c1 sample comes from Ust’Ida Late Neolithic, 180km to the north of Lake Baikal, apparently before the expansion of Q1a2a lineages during the EBA period. While this sample may be related to those expanded later in Finno-Ugric territory (although it may only be related to those expanded much later with Yakuts), other samples are not clearly from those found widely distributed among North-East Europeans only after the Iron Age, or – as in the case of Shamanka II (N1c2), they are clearly not of the same haplogroup.
Regarding Y-DNA data, once again almost 100% of samples from late Khvalynsk/Yamna and derived cultures (like Afanasevo and Bell Beaker) are R1b-L23, no single R1a-M417 lineage found, and few expected by now, if any, within Late Proto-Indo-European territory.
While they claim to take Y-DNA into account to assess migrations – as they do for example with Asian cultures – , their previous model of a Yamna “R1a-R1b community” remains oddly unchanged, and they even insist on it in the supplementary materials, as they do in their parallel Nature paper.
They have also expressly mitigated the use of ancestral components to assess populations, citing the ancestral and modern association of CHG ancestry with different ethnolinguistic groups in the Middle East, to dismiss any rushed conclusions on the origin of Anatolian, and consequently of Middle PIE. And they did so evidently because it did not fit the anthropological data that is mainstream today (supporting a Balkan route), which is the right thing to do.
However, they have apparently not stopped to reconsider the links of CWC and steppe ancestry to ancestral and modern Uralic peoples – although they expressly mention the strong connection with modern Karelians in the supplementary material.
Also, after Narasimhan et al. (2018), there is a clear genetic continuity with East Yamna (in ancestry as in R1b-L23 subclades), so their interpretations about Indo-Iranian in this paper and especially de Barros (Nature 2018) – regarding the Abashevo -> Sintashta/Srunba/Andronovo connection – come, again, too late.