The history of the Indo-Europeans is relatively clear from the Maykop and Yamna periods onwards, as I have described in the R1b and R1a pages on this site. The biggest question marks in my head at the moment are:
- When did the R1a and R1b lineages arrive in the Pontic Steppe and North Caucasus ?
- Where did they come from before that ?
- What were the influence of older neighbouring cultures, notably on agriculture, cattle and woolly sheep herding, and metal working ?
In his book The Making of Bronze Age Eurasia, Philip L. Kohl claims that the Yamna-era steppe culture originated in the Cucuteni-Trypillian culture, and more specifically when the huge towns of the Late Trypillian culture (3500-3000 BCE) in Central Ukraine were abandoned and their inhabitants took up a semi-nomadic lifestyle, herding cattle and moving in wheeled wagons.
Based on the genetic make-up of the Balkans and Carpathians, it is hard to see how the Cucuteni-Trypillian people could have been almost exclusively R1a or R1b people. I had always supported the Kurgan hypothesis of Marija Gimbutas, in which the steppe people destroyed the Cucuteni-Trypillian culture and its people got dispersed around western Ukraine and towards southern Belarus. Like all Neolithic cultures in Europe, the Cucuteni-Trypillian would have been composed essentially of Near Eastern lineages like G2a, E1b, J and T, but probably also of assimilated Mesolithic Europeans (I2a). If they had been the source of semi-nomadic cattle breeders as Kohl believes, the Indo-Europeans would not have been spreading almost exclusively R1a and R1b lineages around Central and South Asia. Another problem is that of the timing, since the Trypillian culture lasted until circa 3000 BCE, over 700 years after the start of the Maykop culture and 500 years after Yamna.
However it is not entirely impossible that the Trypillian settlements in Ukraine were R1a or R1b people descended from the Bug-Dniester culture, a culture that is remarkable in its continuity from the Mesolithic to the Neolithic. Another scenario is that a minority of Cucuteni-Trypillian people belonging to such lineages as G2a3b1 and J2b migrated to the steppe with their cattle and wagons, and been assimilated by the local R1a and R1b tribes. I have long noticed that G2a3b1 and J2b (and perhaps some E1b and T) were minor lineages found alongside the two major Indo-European haplogroups (R1a and R1b). I have not yet resolved whether these G2a and J2b lineages came to the Pontic Steppe from the west (Balkans/Carpathians) or from the south (eastern Anatolia or Mesopotamia) across the Caucasus.
This leads us to the Uruk expansion. From 3700 to 3100 BCE, there appeared to have been a sudden large-scale colonisation of East Anatolia and the Caucasus region by southern Mesopotamians (Sumerians). Recent studies found a level of development at least as high in northern Mesopotamia, so the term of "Uruk" may be misleading. The archaeological culture of this vast region then suddenly collapsed around 3200-3100 BCE when the Bronze-Age Kura-Araxes culture expanded from the South Caucasus (Georgia, Armenia).
The Bronze Age, which seems to have started in the Maykop culture circa 3700 BCE, spread to the Kura-Araxes culture around 3500 BCE, and only started in Mesopotamia after the Kura-Araxes expansion, from 3100 BCE.
It has been suggested that the Chalcolithic Uruk expansion was responsible for the establishment of the advanced Maykop culture in the Northwest Caucasus around 3700 BCE. This hypothesis does not rely only on timing, but also clear cultural affinities and the appearance of woolly sheep in both regions at the same time. Kohl explains that the herding of sheep for wool liberated a lot of fertile land that had until then been used to grow flax for clothing, and that this allowed big surpluses in cereal cultivation, which caused a population boom. That is what may have caused the Uruk expansion.
Unfortunately we do not know what haplogroup those Uruk settlers carried, although I would list G2a, J2, T and R1b among the top candidates. One possibility is that the Uruk contingent that founded Maykop (if indeed it was them) belonged primarily to R1b (at least 80%, through a founder effect) and that they were accompanied by G2a3b1, J2b and T lineages. Another possibility is that these Mesopotamian settlers only carried G2a3b1, J2b and T and mixed with R1b people who were already present in the Pontic Steppe and North Caucasus.
In the two above hypotheses (Uruk and Cucuteni-Trypillian), it is of course possible that G2a3b1 came from one culture and J2b from the other, while both R1a and R1b had been in the Steppe long before. I would think that J2b came from the Balkans/Carpathians to the Steppe, then was brought by the Indo-Europeans to Central and South Asia. T would be a prime candidate for the Uruk settlers. G2a3b1 could have come from S-E Europe, the Caucasus, Anatolia or even Mesopotamia. Only ancient DNA tests can confirm how things really happened. Let's wait and see.
- When did the R1a and R1b lineages arrive in the Pontic Steppe and North Caucasus ?
- Where did they come from before that ?
- What were the influence of older neighbouring cultures, notably on agriculture, cattle and woolly sheep herding, and metal working ?
In his book The Making of Bronze Age Eurasia, Philip L. Kohl claims that the Yamna-era steppe culture originated in the Cucuteni-Trypillian culture, and more specifically when the huge towns of the Late Trypillian culture (3500-3000 BCE) in Central Ukraine were abandoned and their inhabitants took up a semi-nomadic lifestyle, herding cattle and moving in wheeled wagons.
Based on the genetic make-up of the Balkans and Carpathians, it is hard to see how the Cucuteni-Trypillian people could have been almost exclusively R1a or R1b people. I had always supported the Kurgan hypothesis of Marija Gimbutas, in which the steppe people destroyed the Cucuteni-Trypillian culture and its people got dispersed around western Ukraine and towards southern Belarus. Like all Neolithic cultures in Europe, the Cucuteni-Trypillian would have been composed essentially of Near Eastern lineages like G2a, E1b, J and T, but probably also of assimilated Mesolithic Europeans (I2a). If they had been the source of semi-nomadic cattle breeders as Kohl believes, the Indo-Europeans would not have been spreading almost exclusively R1a and R1b lineages around Central and South Asia. Another problem is that of the timing, since the Trypillian culture lasted until circa 3000 BCE, over 700 years after the start of the Maykop culture and 500 years after Yamna.
However it is not entirely impossible that the Trypillian settlements in Ukraine were R1a or R1b people descended from the Bug-Dniester culture, a culture that is remarkable in its continuity from the Mesolithic to the Neolithic. Another scenario is that a minority of Cucuteni-Trypillian people belonging to such lineages as G2a3b1 and J2b migrated to the steppe with their cattle and wagons, and been assimilated by the local R1a and R1b tribes. I have long noticed that G2a3b1 and J2b (and perhaps some E1b and T) were minor lineages found alongside the two major Indo-European haplogroups (R1a and R1b). I have not yet resolved whether these G2a and J2b lineages came to the Pontic Steppe from the west (Balkans/Carpathians) or from the south (eastern Anatolia or Mesopotamia) across the Caucasus.
This leads us to the Uruk expansion. From 3700 to 3100 BCE, there appeared to have been a sudden large-scale colonisation of East Anatolia and the Caucasus region by southern Mesopotamians (Sumerians). Recent studies found a level of development at least as high in northern Mesopotamia, so the term of "Uruk" may be misleading. The archaeological culture of this vast region then suddenly collapsed around 3200-3100 BCE when the Bronze-Age Kura-Araxes culture expanded from the South Caucasus (Georgia, Armenia).
The Bronze Age, which seems to have started in the Maykop culture circa 3700 BCE, spread to the Kura-Araxes culture around 3500 BCE, and only started in Mesopotamia after the Kura-Araxes expansion, from 3100 BCE.
It has been suggested that the Chalcolithic Uruk expansion was responsible for the establishment of the advanced Maykop culture in the Northwest Caucasus around 3700 BCE. This hypothesis does not rely only on timing, but also clear cultural affinities and the appearance of woolly sheep in both regions at the same time. Kohl explains that the herding of sheep for wool liberated a lot of fertile land that had until then been used to grow flax for clothing, and that this allowed big surpluses in cereal cultivation, which caused a population boom. That is what may have caused the Uruk expansion.
Unfortunately we do not know what haplogroup those Uruk settlers carried, although I would list G2a, J2, T and R1b among the top candidates. One possibility is that the Uruk contingent that founded Maykop (if indeed it was them) belonged primarily to R1b (at least 80%, through a founder effect) and that they were accompanied by G2a3b1, J2b and T lineages. Another possibility is that these Mesopotamian settlers only carried G2a3b1, J2b and T and mixed with R1b people who were already present in the Pontic Steppe and North Caucasus.
In the two above hypotheses (Uruk and Cucuteni-Trypillian), it is of course possible that G2a3b1 came from one culture and J2b from the other, while both R1a and R1b had been in the Steppe long before. I would think that J2b came from the Balkans/Carpathians to the Steppe, then was brought by the Indo-Europeans to Central and South Asia. T would be a prime candidate for the Uruk settlers. G2a3b1 could have come from S-E Europe, the Caucasus, Anatolia or even Mesopotamia. Only ancient DNA tests can confirm how things really happened. Let's wait and see.
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