Consequences of O&M 2018 (I): The latest West Yamna “outlier”

This is the first of a series of posts analyzing the findings of the recent Nature papers Olalde et al.(2018) and Mathieson et al.(2018) (abbreviated O&M 2018).

As expected, the first Y-DNA haplogroup of a sample from the North Pontic region (apart from an indigenous European I2 subclade) during its domination by the Yamna culture is of haplogroup R1b-L23, and it is dated ca. 2890-2696 BC. More specifically, it is of Z2103 subclade, the main lineage found to date in Yamna samples. The site in question is Dereivka, “in the southern part of the middle Dnieper, at the boundary between the forest-steppe and the steppe zones”.

NOTE: A bit of history for those lost here, which appear to be many: the classical Yamna culture – from previous late Khvalynsk, and (probably) Repin groupsspread west of the Don ca. 3300 BC creating a cultural-historical community – and also an early offshoot into Asia – , with mass migrations following some centuries later along the Danube to the Carpathian Basin, but also south into the Balkans, and north along the Prut. There is thus a very short time frame to find Yamna peoples shaping these massive migrations – the most likely speakers of Late Proto-Indo-European dialects – in Ukraine, compared to their most stable historical settlements east of the Don River.

There is no data on this individual in the supplementary material – since Eneolithic Dereivka samples come from stored dental remains – , but the radiocarbon date (if correct) is unequivocal: the Yamna cultural-historical community dominated over that region at that precise time. Why would the authors name it just “Ukraine_Eneolithic”? They surely took the assessment of archaeologists, and there is no data on it, so I agree this is the safest name to use for a serious paper. This would not be the first sample apparently too early for a certain culture (e.g. Catacomb in this case) which ends up being nevertheless classified as such. And it is also not impossible that it represents another close Ukraine Eneolithic culture, since ancestral cultural groups did not have borders…

NOTE. Why, on the other hand, was the sample from Zvejnieki – classified as of Latvia_LN – assumed to correspond to “Corded Ware” (like the recent samples from Plinkaigalis242 or Gyvakarai1), when we don’t have data on their cultures either? No conspiracy here, just taking assessments from different archaeologists in charge of these samples: those attributed to “Corded Ware” have been equally judged solely by radiocarbon date, but, combining the known archaeological signs of herding in the region arriving around this time with the old belief (similar to the “Iberia is the origin of Bell Beaker peoples” meme) that “only the Corded Ware culture signals the arrival of herding in the Baltic”. This assumption has been contested recently by Furholt, in an anthropological model that is now mainstream, upheld also by Anthony.

We already know that, out of three previous West Yamna samples, one shows Anatolian Neolithic ancestry, the so-called “Yamna outlier”. We also know that one sample from Yamna in Bulgaria also shows Anatolian Neolithic ancestry, with a distinct ‘southern’ drift, clustering closely to East Bell Beaker samples, as we can still see in Mathieson et al. (2018), see below. So, two “outliers” (relative to East Yamna samples) out of four samples… Now a new, fifth sample from Ukraine is another “outlier”, coinciding with (and possibly somehow late to be a part of) the massive migration waves into Central Europe and the Balkans predicted long ago by academics and now confirmed with Genomics.

I think there are two good explanations right now for its ancestral components and position in PCA:

pca-mathieson2018-yamna
Modified image from Mathieson et al. (2018), including also approximate location of groups from Mittnik et al. (2018), and group (transparent shape outlined by dots) formed by new Bell Beaker samples from Olalde et al. (2018). “Principal components analysis of ancient individuals. Points for 486 ancient individuals are projected onto principal components defined by 777 present-day west Eurasian individuals (grey points). Present-day individuals are shown.”

a) The most obvious one, that the Dnieper-Dniester territory must have been a melting pot, as I suggested, a region which historically connected steppe, forest steppe, and forest zone with the Baltic, as we have seen with early Baltic Neolithic samples (showing likely earlier admixture in the opposite direction). The Yamna population, a rapidly expanding “elite group of patrilineally-related families” (words from the famous 2015 genetic papers, not mine), whose only common genetic trait is therefore Y-DNA haplogroup R1b-L23, must have necessarily acquired other ancestral components of Eneolithic Ukraine during the migrations and settlements west of the Don River.

How many generations are needed for ancestral components and PCA clusters to change to that extent, in regions where only some patrilocal chiefs but indigenous populations remain, and the population probably admixed due to exogamy, back-migrations, and “resurge” events? Not many, obviously, as we see from the differences among the many Bell Beaker samples of R1b-L23 subclades from Olalde et al. (2018)

b) That this sample shows the first genetic sign of the precise population that contributed to the formation of the Catacomb culture. Since it is a hotly debated topic where and how this culture actually formed to gradually replace the Yamna culture in the central region of the Pontic-Caspian steppe, this sample would be a good hint of how its population came to be.

See e.g. for free articles on the Catacomb culture its article on the Encyclopedia of Indo-European Culture, Catacomb culture wagons of the Eurasian steppes, or The Warfare of the Northern Pontic Steppe – Forest-Steppe Pastoral Societies: 2750 – 2000 B.C. There are also many freely available Russian and Ukrainian papers on anthropometry (a discipline I don’t especially like) which clearly show early radiocarbon dates for different remains.

This could then be not ‘just another West Yamna outlier’, but would actually show meaningful ‘resurge’ of Neolithic Ukraine ancestry in the Catacomb culture.

It could be meaningul to derive hypotheses, in the same way that the late Central European CWC sample from Esperstedt (of R1a-M417 subclade) shows recent exogamy directly from the (now more probably eastern part of the) steppe or steppe-forest, and thus implies great mobility among distant CWC groups. Although, given the BB samples with elevated steppe ancestry and close PCA cluster from Olalde et al. (2018), it could also just mean exogamy from a near-by region, around the Carpathian Basin where Yamna migrants settled…

If this was the case, it would then potentially mean a “continuity” break in the steppe, in the region that some looked for as a Balto-Slavic homeland, and which would have been only later replaced by Srubna peoples with steppe ancestry (and probably R1a-Z93 subclades). We would then be more obviously left with only two options: a hypothetic ‘Indo-Slavonic’ North Caspian group to the east (supported by Kortlandt), or a Central-East European homeland near Únětice, as one of the offshoots from the North-West Indo-European group (supported by mainstream Indo-Europeanists).

How to know which is the case? We have to wait for more samples in the region. For the moment, the date seems too early for the known radiocarbon dating of most archaeological remains of the Catacomb Culture.

chalcolithic_late-yamna-catacomb
Diachronic map of Late Copper Age migrations including steppe groups ca. 2600-2250 BC

An important consequence of the addition of these “Yamna outliers” for the future of research on Indo-European migrations is that, especially if confirmed as just another West Yamna sample – with more, similar samples – , early Palaeo-Balkan peoples migrating south of the Danube and later through Anatolia may need to be judged not only in terms of ancestral components or PCA (as in the paper on Minoans and Mycenaeans), but also and more decisively using phylogeography, especially with the earliest samples potentially connected with such migrations.

NOTE. Regarding the controversy (that some R1b European autochthonous continuists want to create) over the origin of the R1b-L151 lineages, we cannot state its presence for sure in Yamna territory right now, but we already have R1b-M269 in the eastern Pontic-Caspian steppe during the Neolithic-Chalcolithic transition, then R1b-L23 and subclades (mainly R1b-Z2013, but also one xZ2103, xL51 which suggests its expansion) in the region before and during the Yamna expansion, and now we have L51 subclades with elevated steppe ancestry in early East Bell Beakers, which most likely descended from Yamna settlers in the Carpathian Basin (yet to be sampled).

Even without express confirmation of its presence in the steppe, the alternative model of a Balkan origin seems unlikely, given the almost certain continuity of expanding Yamna clans as East Bell Beaker ones, in this clearly massive and relatively quick expansion that did not leave much time for founder effects. But, of course, it is not impossible to think about a previously hidden R1b-L151 community in the Carpathian Basin yet to be discovered, adopting North-West Indo-European (by some sort of founder effect) brought there by Yamna peoples of exclusively R1b-Z2103 lineages. As it is not impossible to think about a hidden and ‘magically’ isolated community of haplogroup R1a-M417 in Yamna waiting to be discovered…Just not very likely, either option.

As to why this sample or the other Bell Beaker samples “solve” the question of R1a-Z645 subclades (typical of Corded Ware migrants) not expanding with Yamna, it’s very simple: it doesn’t. What should have settled that question – in previous papers, at least since 2015 – is the absence of this subclade in elite chiefs of clans expanded from Khvalynsk, Yamna, or their only known offshoots Afanasevo and Bell Beaker. Now we only have still more proof, and no single ‘outlier’ in that respect.

No haplogroup R1a among hundreds of samples from a regionally extensive sampling of the only cultures mainstream archaeologists had thoroughly described as potentially representing Indo-European-speakers should mean, for any reasonable person (i.e. without a personal or professional involvement in an alternative hypothesis), that Corded Ware migrants (as expected) did not stem from Yamna, and thus did not spread Late Indo-European dialects.

This haplogroup’s hegemonic presence in North-Eastern Europe – and the lack of N1c lineages until after the Bronze Age – coinciding with dates when Uralicists have guesstimated Uralic dialectal expansion accross this wide region makes the question of the language spread with CWC still clearer. The only surprise would have been to find a hidden and isolated community of R1a-Z645 lineages clearly associated with the Yamna culture.

NOTE. A funny (however predictable) consequence for R1a autochthonous continuists of Northern or Eastern European ancestry: forum commentators are judging if this sample was of the Yamna culture or spoke Indo-European based on steppe component and PCA cluster of the few eastern Yamna samples which define now (you know, with the infallible ‘Yamnaya ancestral component’) the “steppe people” who spoke the “steppe language”™ – including, of course, North-Eastern European Late Neolithic

Not that radiocarbon dates or the actual origin of this sample cannot be wrong, mind you, it just strikes me how twisted such biased reasonings may be, depending on the specific sample at hand… Denial, anger, and bargaining, including shameless circular reasoning – we know the drill: we have seen it a hundred times already, with all kinds of supremacists autochthonous continuists who still today manage to place an oudated mythical symbolism on expanding Proto-Indo-Europeans, or on regional ethnolinguistic continuity…

More detailed posts on the new samples from O&M 2018 and their consequences for the Indo-European demic diffusion to come, indeed…

See also:

Something is very wrong with models based on the so-called ‘Yamnaya admixture’ – and archaeologists are catching up (II)

A new article by Leo S. Klejn tries to improve the Northern Mesolithic Proto-Indo-European homeland model of the Russian school of thought: The Steppe hypothesis of Indo-European origins remains to be proven, Acta Archaeologica, 88:1, 193–204.

Abstract:

Recent genetic studies have claimed to reveal a massive migration of the bearers of the Yamnaya culture (Pit-grave culture) to the Central and Northern Europe. This migration has supposedly lead to the formation of the Corded Ware cultures and thereby to the dispersal of Indo-European languages in Europe. The article is a summary presentation of available archaeological, linguistic, genetic and cultural data that demonstrates many discrepancies in the suggested scenario for the transformations caused by the Yamnaya “invasion” some 5000 years ago.

Excerpts:

Both teams [Reich/Anthony, and Willerslev/Kristiansen] interpreted this resemblance in the same way: as evidence of mass migration of the Yamnaya culture from the steppes into the Central and Northern Europe, resulting in the formation of the Corded Ware cultures, and these are universally recognised as Indo-European. Since earlier in this part of Europe existed a different pool of genomes, geneticists presumed that the Yamnaya migration alone had brought the Indo-European languages into Europe. It is difficult to say to what extent the pre-convictions of the involved archaeologists influenced these conclusions, or whether the results of the genetic studies attracted archaeologists with such beliefs.

Mismatch of cultural manifestations

First, we might question the idea of the Yamnaya culture as a unity rather than a loose conglomerate of cultures. Merpert (1974) divided it into nine local groups but did not recognise them as separate cultures. However, in 1975 I suggested that Nerushay (Budzhak) monuments should be recognised as a distinct culture (Klejn 1975), although still as a part of the same broader steppe community.

This was accepted by other specialists (Ivanova 2012; 2013; 2014). Generally, in the western branch of this community, a mixture of the eastern rites of interment with local, Balkan ceramics can be observed. It should be noted that hitherto all genetic samples were taken from eastern material (in the vicinity of Samara in the Volga basin and Kalmykia), while the central thesis concerns the intrusion of the western branch of this community (Budzhak culture) into Europe.

yamnaya-corded-ware.connection
The spread of cultural-historical communities of the Yamnaya culture and the location of the Budzhak culture. GAC – Globular Amphora culture; CWC – Corded Ware culture. After Ivanova 2013.

Simultaneity of cultures

The Yamnaya culture (Chernykh & Orlovskaya 2004a; Heyd 2011; Frȋnculeasa et al. 2015) appears not to be the predecessor of the Corded Ware cultures but is contemporary with them. The Corded Ware cultures appeared also around the turn between the fourth and third millennium BC (Stöckli 2001; Furholt 2003). Their derivation from the Yamnaya seems, therefore, to be less probable. This is evidenced by the fact that the corded beakers or amphorae found in the Budzhak culture are not the prototypes of the corded beakers or amphorae found in more northern territories, but seem instead to be an outcome of contemporaneous contacts (Ivanova 2014; Klejn 2017c).

Discrepancies across the haplogroups

Even more remarkable is the variation in the distribution of types of Y chromosome. In the Yamnaya population, R1b is not just a single occurrence (there are about seven known occurrences) while in the Corded Ware population a different clade of R1b is found and R1a is predominant (several instances). Thus the postulate of unbroken succession finds no support!

yamna-into-corded-ware
Distribution of artefacts and customs of the Yamnaya culture in the area of the Corded Ware cultures. After Bátora 2006.

Paradoxical gradient

In the tables presented in the article by Reichs’ team (Haak et al. 2015) the genetic pool connecting the Yamnaya culture with the Corded Ware people is shown to be more intense in Northern Europe (Norway and Sweden) and decreases gradually from the North to the South (Fig. 6). It is weakest around the Danube, in Hungary, i. e. areas neighbouring the western branch of the Yamnaya culture! This is the reverse image to what the proposed hypothesis by the geneticists would lead us to expect. It is true that this gradient is traced back from the contemporary materials, but it was already present during the Bronze Age (Klejn 2015a).

The author also uses questionable interpretations from selected articles to advance his (as of today) untenable positions regarding a Mesolithic origin of the reconstructible Proto-Indo-European language.

1. Glottochronology, for a PIE origin:

If based on the data of glottochronology (taking into account all disputes) the period of initial dispersal is to be dated to the 7th-5th millennium BC.

2. Doubts on the origin of R1b-L51 subclades expressed in Genetic differentiation between upland and lowland populations shapes the Y-chromosomal landscape of West Asia, by Balanovsky et al. (2017), Human Genetics 136, 4. 437-450:

The currently available dataset does not contradict the hypothesis that R-GG400 marks a link between the East European steppe dwellers and West Asians, though the route and even direction of this migration is disputable. It does, however, demonstrate that present-day West European R1b chromosomes do not originate from the Yamnaya populations analyzed in (Haak et al. 2015; Mathieson et al. 2015) and raises the question of their origin. A Bronze Age origin is more likely than a Neolithic one (Balaresque et al. 2010), but further ancient DNA studies may be necessary to identify this source.

Just yesterday I read the post The retraction paradox: Once you retract, you implicitly have to defend all the many things you haven’t yet retracted, by Andrew Gelman. While – in my opinion – the post does not live up to its title, it poses an interesting question, as to how ad logicam (fallacy fallacy) is often used today in research: One author proposes something that is later demonstrated to be wrong, so everything they wrote or write can be said ipso facto to be wrong…especially if they accept that it was wrong.

This is usual with amateur geneticists (those who don’t publish, and are therefore not subjected to criticism): if anyone is wrong (whether in Archaeology or Genetics), then they are wrong in everything else. It seems to me that Klejn’s theses against recent genetic results rest on the same assumption: The Yamna -> Corded Ware migration model is wrong, ergo the Yamna homeland model is wrong.

I guess this same fallacy is what a lot of angered geneticists (whether professional or amateurs) are going to use to dismiss Klejn’s criticism, trying to focus on what he clearly does not grasp – about genomic data of Yamna peoples and their expansion – to disregard his doubts on genetic interpretations entirely.

I have warned many times about how simplistic interpretations of genetic data would cause a general mistrust in the field, and that archaeologists won’t take the discipline seriously, no matter how many articles get published in famous research tabloids like Nature or Science…

Those who dismiss this warning lightly seem to forget the fate of other recent “scientific breakthroughs” which were initially so promising that Humanities appeared to matter no more, like glottochronology for Linguistics and, to some extent, that of radiocarbon analysis for Archaeology.
EDIT: see here a recent example of discusion on discrepancies between archaeological and 14C-based chronologies, whereby ‘scientific data’ obviously needs archaeological context for a meaningful interpretation

Featured image: The direction of the supposed migration of the bearers of the Yamnaya culture into the area of the Corded Ware cultures. After Haak et al. 2015.

NOTE: I obviously don’t agree with Klejn’s main model: he criticises the Proto-Indo-European steppe homeland, and more specifically the expansion of Yamna peoples with R1b-L23 subclades, which I support. But, probably because of his “pre-convictions” (as he puts it when describing proponents of the steppe hypotheses) about the Proto-Indo-European homeland in Northern Europe during the Mesolithic, he was one of the first renown archaeologists to criticise the obvious inconsistencies in the genetic model of migrations based exclusively on the “Yamnaya ancestral component” concept, and to provoke the necessary reaction from (until then) overconfident geneticists, and he deserves credit for that.

In my opinion, the Russian school’s “Northern European Mesolithic” homeland model – as I have said before – could be based on the appearance of EHG ancestry, or maybe on the expansion of haplogroup R1b with post-Swiderian cultures, but the timeframe proposed is too early for any reconstructible parent proto-language, even for Indo-Uralic.

Related:

The new “Indo-European Corded Ware Theory” of David Anthony

allentoft-yamna-corded-ware

I recently wrote about the Indo-European Corded Ware Theory of Kristian Kristiansen and his workgroup, a sort of “Danish school”, whose aim is to prove a direct, long-lasting interaction between the North Pontic steppe and east European cultures during the Late Neolithic, which supposedly gave rise to a Late Indo-European-speaking Corded Ware culture. That is, a sort of renewed Kurgan model; or, more exactly, Kurgan models, since there is no single one preferred right now.

David Anthony had remained more or less in the background after the controversial assessment of the so-called Yamnaya ancestral component by recent genetic papers, which posited that there was a genetic flow in the Late Neolithic suggesting a migration model that could be hypothetically simplified to Yamna -> Corded Ware -> Bell Beaker.

With his previous publications, especially The Horse, the Wheel, and Language: How Bronze-Age Riders from the Eurasian Steppes Shaped the Modern World (and its revisions), Anthony had set up an impressive revised steppe theory that overcame some of the errors of Gimbutas’ Kurgan model.

Whereas Indo-European-speaking Corded Ware cultures (CWC) were still featured prominently in his model, the different languages supposedly spoken by these groups were explained through multiple cultural diffusion events, and actual migrations from Yamna peoples were only described into Early Bronze Age cultures of the Balkans, and into the Afanasevo culture.

More recently, he has offered (in collaboration with his wife, Dorcas R. Brown) a tentative original connection Yamna -> Corded Ware in the Lesser Poland region, in their paper Molecular archaeology and Indo-European linguistics: Impressions from new data. It seemed to be based merely on recent genetic finds, and on the fact that Corded Ware remains appear to be oldest in that region, according to radiocarbon analysis.

Now he seems to be more and more supportive of this hypothesis in his new essay, Archaeology and Language: Why Archaeologists Care About the Indo-European Problem, in European Archaeology as Anthropology: Essays in Memory of Bernard Wailes ed by P.J. Crabtree and P. Bogucki (2017).

The chapter is interesting to read, as always. Nevertheless, it commits to previous errors – driven by the wrong interpretation of recent genetic papers -, and deepens thus this untenable archaeological-linguistic model of migrations from the steppe, in a weird vicious circle of wrong feedback between archaeologists and geneticists that diregards what archaeologists have been saying in the last decade.

Instead of waiting for the current storm of genetic papers (and their misinformation) to pass, and see what remains, Anthony is now supporting a different model than the one that made him popular, risking the good name he has earned in Archaeology and in popular science texts – in spite of initial setbacks due to the prevailing criticisms of Indo-European migration models.

Some excerpts (emphasis mine):

indo-european-corded-ware-bell-beaker
Central and Eastern Europe ca. 3000–2500 BCE showing the early Yamnaya culture area 3300–2700 BCE and the Yamnaya migration up the Danube Valley with related/offshoot Makó and Vučedol sites; also the distribution of Corded Ware sites in northern Europe; and site areas sampled for aDNA in Haak et al. (2015). The oldest Corded Ware radiocarbon dates are from southern and central Poland. The Yamnaya cemeteries in the Danube Valley are after Heyd (2011), the shaded Globular Amphorae site area is after Harrison and Heyd (2007); the Corded Ware and Globular Amphorae sites in southern Poland are after Machnik (1999); and the blue dots were all Corded Ware sites with radiocarbon dates as of Furholt (2003).

A Yamnaya migration from the steppes up the Danube valley as far as Hungary was already accepted by many archaeologists (Fig. 2.2). Hundreds of Yamnaya-type kurgans and dozens of cemeteries have been recognized by archaeologists in the lower Danube valley, in Bulgaria and Romania; and in the middle Danube valley, in eastern Hungary, with radiocarbon dates that began about 3000–2800 BCE and extended to about 2700–2600 BCE (Ecsedy 1979; Sherratt 1986; Boyadziev 1995; Harrison and Heyd 2007; Heyd 2012; Frînculeasa et al. 2015). The migration stream that created these intrusive cemeteries now can be seen to have continued from eastern Hungary across the Carpathians into southern Poland, where the earliest material traits of the Corded Ware horizon appeared (Furholt 2003). Corded Ware sites appeared in Denmark by 2800–2700 BCE, probably within 100–200 years after the first Yamnaya migrants entered the lower Danube valley. This surprisingly rapid migration introduced genetic traits such as the R1a and R1b Y-chromosome haplogroups and a substantial element of ANE (Ancient North Eurasian) ancestry that remain characteristic of most northern and western Europeans today.

(…)

The oldest radiocarbon dates from Corded Ware sites occur in southern Poland (upper Vistula) and north-central Poland (Kujavia), and this was seen as the region where the early networking of amphorae styles from Globular Amphorae and axe types from Scandinavia began. The genetic evidence shows a somewhat different picture: the Corded Ware people were largely immigrants whose ancestors came from the steppes (probably immediately from eastern Hungary), but they quickly adopted local material traits in amphorae and axe types that obscured their foreign origins. Middle Neolithic northern European populations composed of admixed WHG/EEF survived but were largely excluded from Corded Ware cemeteries, and from marriage into the Corded Ware population. Even centuries after the initial migration the Corded Ware population at Esperstedt, dated 2500–2400 BCE, still exhibited 70–80% Yamnaya genes, although individual variations in the extent of local admixture were apparent. Intermarriage with the surviving local population was more frequent during the ensuing Bell Beaker period. However, the resurgence is more visible in mtDNA than in Y-DNA (Szécsényi-Nagy et al. 2015), suggesting that men of the older EEF heritage were disadvantaged more than women.

(…)

Settlements were more permanent before the Corded Ware migration, and remained so among the Globular Amphorae people, who continued to create more localized site-and-cemetery groups in the same landscape with the more mobile immigrants. Afterward, during the Bell Beaker period, when local genetic ancestry rebounded and the population became more admixed, settlements again were more permanent. The Corded Ware culture introduced both a large, steppe-derived population and an unusually mobile form of pastoral economy that was a regional economic anomaly, but nevertheless survived in varying forms for centuries before the regional economic pattern was re-established. A steppe language certainly accompanied this demographic and economic shift. As we have seen above, there are good independent reasons (loans with Uralic and South Caucasian) to think that PIE was spoken in the steppes. It is likely that the steppe language introduced between 3000–2500 BCE was a late (post-Anatolian) form of PIE and survived and evolved into the later northern IE languages.

So, to sum up the new developments of Anthony’s preferred model:

  1. Abandonment of the multiple cultural diffusion models from Yamna into Corded Ware, i.e. Pre-Germanic (in the Usatovo culture) and Pre-Balto-Slavic (in the Middle Dnieper culture).
  2. The only potential Yamna connection with Corded Ware in Archaeology must come from Yamna migrants in the Carpathian basin. Therefore, R1a must come from Hungarian settlements.
  3. Corded Ware cultures from Northern Europe, from roughly 2800 BC, must come from Yamna settlers of the Carpathian basin.
  4. Esperstedt is a great example of Yamnaya genes, and of the mobility (and lack of intermarriage) of Corded Ware peoples centuries, after their migration from Yamna settlers in Hungary.

My answers (obvious for anyone reading this blog, or my demic diffusion model):

  1. It is a pitty that cultural diffusion models are abandoned. They were the last hope to keep these IE-CWC/Kurgan hypotheses alive.
  2. The Carpathian Basin is obviously the only potential early connection between Corded Ware and Yamna. But no single R1a has been found in western migrants, and admixture (including ancestral components and PCA) from Early Yamna, West Yamna, Balkan EBA, and early Bell Beaker samples from Hungary make it very unlikely that such a connection existed.
  3. Corded Ware peoples formed and began their migration much earlier than Yamna settlers arrived in the Carpathian Basin. Compare e.g. the Late Neolithic sample from Latvia (dated ca. 2885 BC) with steppe ancestry attributed to Corded Ware, or the early appearance of east European cultures like Fatyanovo-Balanovo or Abashevo. Also, known Yamna migration routes don’t include these proposed population expansions.
  4. I have already written about the Esperstedt outlier, and why its definition as an outlier should have been clearly made to avoid this kind of misinterpretations…
yamna-bell-beaker
Yamna – East Bell Beaker migration ca. 3000-2300 BC, according to Heyd (2007)

With each new genetic paper it is less and less likely that many individuals of Y-DNA haplogroup R1a, and especially R1a-Z645 (if any at all), will appear associated with Yamna, either in the Pontic-Caspian steppe or in western settlements (at least clearly belonging to Yamna, Balkan EBA, or Bell Beaker cultures), which will make the life of this new Indo-European Corded Ware Theory model still shorter than could be a priori expected for any archaeological model.

Also, it seems that the Bell Beaker preprint paper by Olalde et al. (2017) will be published in Nature soon with more samples, so a swift rejection of this theory may be near. On the other hand, the first paper on this model by Anthony and Brown (like the first paper of Kristiansen and his workgroup) appeared just before Olalde et al. (2017) and Mathieson et al. (2017), and yet all samples against their pet theories have not deterred any of them to continue supporting them…

I would say it is a shame that some geneticists are misleading good archaeologists into so many different wrong models, but I guess it is only fair to blame authors for what they write, not whom or what they trusted to write…

I think there is much more to be said about the interaction among Neolithic cultures from the steppe (viz. Sredni Stog and Khvalynsk), than about the Yamna migration, and Anthony was in a better position to judge this. Right now, it seems that other researchers like Rassamakin or Ivanova are taking the lead in the research of Neolithic cultures from the steppe, while Heyd or Prescott are taking the lead in the explanation of Yamna -> Bell Beaker migrations and their connection with the expansion of Late Indo-European languages.

#EDIT (December 18 2017): Just to be clear, Anthony’s new Indo-European Corded Ware Theory model in Archaeology would be compatible with the development and expansion of a North-West Indo-European dialect of Late Indo-European in Linguistics (which is my main source of disagreement with other recent models). In fact, Anthony’s new model could explain the different nature of Balto-Slavic, being adopted by peoples of mainly R1a-Z645 subclades of Lesser Poland – from Yamna migrants of R1b-L23 subclades – , and later influencing Pre-Germanic brought by Bell Beakers to Scandinavia, so in that sense it could offer some light to certain controversial linguistic aspects. See Corded Ware Substrate Theory for more on Germanic and Balto-Slavic similarities based on a common, intermediate substrate.

What I am criticising with this post is that the model seems to rely heavily (in fact, almost solely) on what some geneticists (and especially amateurs, fanboys of specific haplogroups and/or admixture components) are selling about the ‘Yamnaya component’ (and thus the assumption of a common migration of peoples of R1a-Z645 and R1b-L23 subclades), something which is – to say the least – highly controversial today. Instead of departing from Archaeology (his field) to try and make sense of what others are saying, he seems to be abandoning his own migration models and adopting one compatible with genetic studies of 2015-2016 made by laymen in Indo-European studies, who based their conclusions on their own new methods, applied to a few scattered samples. These new IECWT proponents are thus in turn giving still more reasons for these geneticists to support wrong assumptions in future studies, by relying on any of these new potential archaeological scenarios. And so on and on it goes…

Related:

Indo-European demic diffusion model, 3rd edition

pca-yamna-corded-ware

I have just uploaded the working draft of the third version of the Indo-European demic diffusion model. Unlike the previous two versions, which were published as essays (fully developed papers), this new version adds more information on human admixture, and probably needs important corrections before a definitive edition can be published.

The third version is available right now on ResearchGate and Academia.edu. I will post the PDF at Academia Prisca, as soon as possible:

pca-map-yamna-corded-ware-bell-beaker
Map overlaid by PCA including Yamna, Corded Ware, Bell Beaker, and other samples

Feel free to comment on the paper here, or (preferably) in our forum.

A working version (needing some corrections) divided by sections, illustrated with up-to-date, high resolution maps, can be found (as always) at the official collaborative Wiki website indo-european.info.

Marija Gimbutas and the expansion of the “Kurgan people” based on tumulus-building cultures

kurgan-expansion

An interesting article that I keep stumbling upon, The tumulus in European prehistory: covering the body, housing the soul, by Anthony Harding (2011):

Finally, in Kurgan IV she saw “continuous waves of expansion or raids[that] touched all of northern Europe, the Aegean area, and the east Mediterranean areas possibly as far south as Egypt”. This was the period of the Catacomb Graves, but also the Early Bronze Age rock-cut tombs of the Mediterranean, Vučedol, Bell Beakers in Hungary, the Single Grave culture of the Nordic region. The Kurgan Culture reached Ireland, she remarked in a paper of 1978 “as early as 3500 B.C.” – by which she presumably referred to megalithic mounds covering passage tombs.

(…)

According to Gimbutas, the “Kurgan people” are evidenced by single graves in deep shafts, often in wooden chests (coffins) or stone cists marked by low earth or stone barrows; the dead lay on their backs with legs contracted; they were buried with flint points or arrowheads, figurines depicting horses’ heads, boars tusk ornaments and animal tooth pendants. Human sacrifice was allegedly performed during the funeral ceremonies,and sometimes ritual graves of cattle and other animals were added. This is said to contrast with what Gimbutas called the culture of Old Europe (i.e. the earlier Neolithic of the Balkans), who “betray a concern for the deification of the dead and the construction of monumental works of architecture visible in mortuary houses,grave markings, tumuli, stone rings or stone stelae, and in the large quantity of weapons found in the graves”.

(…)

single-graves-kurgan
The varying burial traditions of the Early Bronze Age in Central and Eastern Europe (Häusler 1977, fig. 1). Circles: tumuli with the “mound edge principle”. Semicircles: tumuli. Stippling: cremation; other symbols represent inhumation graves, divided according to orientation and sex

Can we really associate the practice of mound-building with a specific people, and assume that the spread of the practice indicates the spread of the people? That is one of the “big questions” of European archaeology, and one which a number of papers in the volume address. My own position is that the practice of tumulus building seems so widespread in time and space that it seems hard to associate it with one particular ethnic group – though I can understand how, in the melting pot that was Early Europe, people could believe this to be the case. There are, however, major arguments against the idea, on archaeological grounds alone – which Häusler’s map indicates very clearly. Burial mode and grave form in Copper and Bronze Age Europe was far too variable for any such simplistic correlation. In any case, what are we to make of the appearance of tumuli in such far-flung places as Japan or North America, where tumuli are very common? It was always unlikely that the megalithic tombs of western Europe were to be associated with movements from the steppe 1000 or 2000 years earlier, and nothing that has happened since Gimbutas was writing has changed that situation

Research has corrected Gimbutas’ opinion on the time of spread of Indo-Europeans, on the role of the horse (see e.g. Anthony 2007) in their expansion, and the unrelatedness of the two main central European Chalcolithic archaeological packages: the Corded Ware package that expanded from the Balkans into north-eastern Europe, and the Yamna package (together with the proto-Beaker package) that evolved into the East Bell Beaker culture.

yamna-migration
Extent of migration of the “Yamna package“, from Heyd 2007

However, the shadow of the “Kurgan people” remains in the outdated body of innumerable writings. It was revived with the first attempts at disentangling Europe’s genetic past (based on the role of R1a in expanding Proto-Indo-European).

Particularly strong in that sense is the model set forth by Kristiansen, who was nevertheless aware since his first proposal of the differences between the ‘Kurgan people’ of the steppe and those of the Corded Ware culture, selecting thus an alternative framework of long-lasting human and economic interactions between the “Kurgan people”, the Globular Amphora and Baden cultures with an origin of the culture in the natural region formed between the Upper Dnieper and Vistula rivers.

This idea is continued today, and has been recently linked with the Agricultural Substrate Hypothesis. Originally proposed by Kroonen and linked to the spread of Middle Eastern “R1b1b2” with agriculture, it is now (in Kristiansen et al. 2017 and more recently in Iversen and Kroonen 2017) linked with the expansion of the Corded Ware culture, thus proposing that Pre-Germanic is a branch separated some 6,000 years ago from other branches…

kurgans-corded-ware
Kristiansen’s (1989) schematic presentation of basic principles of burial positions in the Late Neolithic / EBA cultures in northern Eurasia, following to some extent Häusler (1983)

The linguistic proposal is obviously compatible with mainstream archaeological models – which suggest the introduction of Pre-Germanic in Scandinavia with Bell Beaker peoples -, but since the linguistic proposal alone would probably not make such a fuss without the accompanying genetics, I guess this is the right way to publicise it. I doubt linguists really care about genetics, and I really doubt amateur geneticists will read the linguistic proposal, but who cares.

Kristiansen’s traditional model is obviously in contrast with contemporaneous anthropological writings by Anthony, Heyd, or (Gimbutas’ pupil) Mallory, but is nevertheless becoming a resilient tradition in the interpretation of results in studies of human ancestry in Europe.

I doubt that Gimbutas, who was not very fond of tradition, would be proud of this kind of legacy, though…

Featured image: “European dialect” expansion of Proto-Indo-European according to The Indo-Europeans: Archeological Problems, Gimbutas (1963). Observe the similarities of the western European expansion to the recently proposed expansion of R1b lineages with western Yamna and Bell Beaker.

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