Another point. ANE{Ancestral North Eurasian (ANE): Upper-Paleolithic genomes from the Lake Baikal region of Siberia, identified as Malta--ydna R* variant, Afontogora 2, and Afontogora 3, dated to 17 to 24 kya, when Mammoths roamed the area, form the ANE cluster.} is higher in certain areas especially those with high concentration of R1b[The Tabasarans are an ethnic group who live mostly in Dagestan,}.
Surveying yfull it looks like one of the regions (other than Turkey) that consistently shows very basal types of R1b is the western coast of the Persian Gulf - Bahrain, Qatar, Saudi Arabia and so forth. Naturally Iraq & Iran will be underrepresented in commercial tests, but I'm sure we would see the same pattern there.
The map that is often quoted from Hovhannisyan et al. (2014) which shows the highest variance in the Armenian plateau is quite misleading. While the high diversity in Armenia is real enough, the joining network actually shows that most branches there are rather terminal. This suggests to me complex migrations rather than deep presence in the region.
If I had to guess R1b based on what little evidence there is I'd say R1b or its ancestor came to West Eurasia by crossing the Persian Gulf. Diversification of R1 and subsequent expansion in one of the nearby Paleolithic industries of Pakistan (I'm thinking perhaps Karachi) would make much more sense than Siberia in any case.
Edit: The same seems to be true for early branches under R1a, only that their distribution seems to be even more southern. Iraq, Yemen, Egypt, Tunisia. This is not consistent with the mammoth hunter hypothesis.
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