I shall try to explain how i found this out: i ran my dna (97% finnish lapland) through dna admixture calculators. Through these I found out, for example, that I have 80% similar dna markers as a finnish-sami lady who was buried in a lake 800 years ago, a chinese man who was the forefather of a bunch of chinese people who moved up to siberia, where my ancestors hung around a bit before hopping on over to finland. Among these Ötzi made his grand entrance.
Because the extreme bottle-neck genetics that is the finnish sami-population apparently I have a very undialuted dna. :')