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I am not really suprised at all, this pattern of replacement or swamping is known from the nordic and finnic cotoaisnlion of saami areas where the saami behaived as peaceful retreaters in most cases as they where quickly outnumbered resulting in the modern saami settlement restricted to highland or remote areas with minimal genetic inprint in the earlier settlement areas, however of course it is possible that the saamis in these long gone areas had a different genetic profiles of the saamis known today.