Angela
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Please open Google Maps and check where are Mentese and Barcin located.
These are two places in westernmost Turkey, almost at the gates of Europe.
I consider I2c and C1a2 in that area as the result of gene flow from Europe.
This gene flow is confirmed in autosomal DNA, which shows 10-15% WHG.
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As for C1a2 - it was probably Southern European (from Iberia to the Balkans).
Which sample was C1b ???
IMHO there is not enough evidence that people in those regions were similar to each other to count them as one.
A few samples of I2c and C1a2 in Anatolia only prove that there was some limited gene flow, but nothing more.
We actually have not enough samples from Southeastern Europe. That single R1b from Villabruna was buried in Northern Italy, so it doesn't count as Southeastern Europe (even if his lineage originated from that region, as David Reich speculated).
You have no way of knowing how far down into Anatolia and the Levant ydna haplogroup I2c penetrated. The autosomal data would indicate that it probably went further south than far northwestern Anatolia.
You have no way of knowing where the refuge for WHG was located, or whether, as the Reich Lab paper indicated was a possibility, whether the refuge was in the Near East.
Ditto for C1a2.
In post after post you are presenting speculations, and not particularly well supported speculations, as fact.
It's not at all persuasive. The only thing that is extremely clear is that you are not objectively trying to analyze the data. Instead, every fact is interpreted always and solely to support a very clear agenda.
Movement of technology for you always means gene flow unless that gene flow comes from south of the Caucasus.
What you have not addressed is why we find these R clades all the way in Siberia a long time indeed before, according to your hypothesis, they should have arrived there from their homeland in eastern Europe.
Bicicleur: around LGM Caspian Sea expanded upto Khvalynsk area, Aral Sea flooded into Caspian Sea and Caspian Sea via Manych depression into Black Sea, maybe around time of Seraglazovo
flooding of Black Sea from Mediterranean probably was 10 ka or earlier
maybe R1a1a was born in Seraglazovo and from there expanded to EHG and to EN Bajkal, this was not IE
Certainly makes more sense than that R formed in the far northeast and then went straight to Eastern Europe where all subsequent development took place always and only in eastern Europe.
I suggested this long ago, but as always the "usual suspects" shot it down.