Originally Posted by
Arborean
They found M417 in Neolithic Ukraine. So, I agree M417 was probably common, at least in Thracians/Dacians. We know at least Z93 was found in a Thracian. To be truthful we still don't have ancient M458(sadly these guys practiced alot of cremation). For all we know Z280/M458 could be found in some ancient samples though I imagine they would be basal. There could have been back migrations, with the younger clades of these lineages occurring as a result of the ethnogenesis of the Proto-Slavs. the clades common in Slavic R1a for instance could be Slavic founder effects even. If its true as some claim that Proto-Thracian/Proto-Dacian were close to Proto-Balto-Slavic. Then we can hyopthesize somewhere along the line that some variety of R1a intersected these lines at a common origin, with Proto-Slavs possibly descended from a Northern cousin of Proto-Thracian/Proto-Dacian that only migrated to the Balkans later, whilst the lines of distantly related Dacian/Thracian would have mostly died out. The modern distribution of some of these lines only tells us where they common today.
In other words Proto-Thracians, and Proto-Dacians could have theoretically descended from a source population in common with Proto-Balto-Slavs. While they would have splintered off southwards in antiquity, Proto-Slavs would have developed from a later migration from this source population that upon intermixing with groups within their trajectory, would contribute to the ethnogenesis of Proto-Slavs. At least this is my theory.
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