I'm looking for a bit more information on the origins/spread of HG J2a2 (PF5008).

I am positive for a sub-clade under it but (apart from the y-full tree) can't seem to much about where it may have begun, which cultures it was associated with, and where it may prevail today etc..

Hence I thought I'd put this thread together - please feel free to share info/resources/thoughts relevant to J2a2