The bulk of the G2a in the caucuses (G2a1-Z6702) is quite young, only around ~6,500 years according to YFull. Which aligns better with G2a arriving to the caucuses during the neolithic rather than G2a being a major lineage in CHG.
at Szigmund
He's referring to Haplogroup I-L161>S2639 a pre-indo european haplgroup brought to britain by neolithic farmers and a relative to L621 by their common ancestor Y3104. There are S2639 remains in neolithic scotland but I'm not aware of any specifically pictish remains belonging to S2639.
what exactly do you mean by "strictly european"? if you mean by how endemic one haplogroup is to europe then only haplogroup I really counts since I (putting aside minor haplos like C-V20) is the only major haplogroup to likely have been formed in europe (I's ancestor IJ was likely born in west...
the neolithic irish population didn't move anywhere (where would they move to?) they were largely extirpated with the arrival of bell beakers to Ireland ~2,500 BC (4,500 BP) and must have been a very large replacement since ireland is 90%+R1b-P312 and preceding neolithic haplogroups like...
I-M223 (I2a1b1) in Britain you're referring to I-M284 (I2a1b1a1a) came to Britain with neolithic farmers and has nothing to do with any migration from the steppe. Just happened to be one of the few neolithic british lineages to survive.
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