Below is a plot for a K = 17 ADMIXTURE analysis that includes samples from across prehistoric Eurasia.
The correspondences between the colors and the components are as follows:
Bushman and Pygmy
Western Negroid
Eastern Negroid
European hunter-gatherer Caucasoid
Northern European Caucasoid
Southern European Caucasoid
Northern Middle Eastern Caucasoid
Southern Middle Eastern Caucasoid
Veddoid-Caucasoid hybrid
Taiwanese aborigine Mongoloid
Southern Mongoloid
Northern Mongoloid
Itelmen and Koryak
Eskimo
Northern Amerindian
Southern Amerindian
Australoid
In this analysis the prehistoric R1b and R1a populations of Europe and Northern Asia show little to none of the Middle Eastern or South Asian components that they appear to have so much of in other ADMIXTURE analyses.
David Reich and his associates at one time made the absurd claim that Northern Europeans have a large amount of admixture from an Amerindian-like population, and they later claimed that the people of the Pit Grave culture had a large amount of admixture from an Armenian-like population. But just as the appearance of Amerindian-like admixture in Northern Europeans was an illusion that resulted from Northern-European-like admixture in Amerindians, the appearance of Middle Eastern or South Asian admixture in northern R1b and R1a populations like the Pit Grave population is an illusion resulting from admixture from R1b and R1a northerners in the populations of the Middle East and South Asia.
Genetiker 
So, the Pit Grave people had the North European component in an overwhelming proportion. I wonder whether that means that component in the modern European populations came from that population source, rather than the darker blue European hunter-gatherer component?
Also, I’d be interested in seeing Kennewick Man’s results run through this calculator. His genome can be found from the links on this page: http://www.y-str.org/2015/07/8300-year-old-ancient-dna-of-kennewick.html Anzick 1 seems to be classified as 100% Amerindian here. I wonder if a component related to Kennewick Man’s mtdna X2 will make something other than that show up here.
I just noticed something else on your graph here: the second `Middle Dorset` sample has a large proportion (about 35%) of the European hunter-gatherer component. I’d be interested to see if Kennewick Man’s sample would show a similar result there.
I wonder whether that means that component in the modern European populations came from that population source, rather than the darker blue European hunter-gatherer component?
It doesn’t. The DNA that makes up most of the Northern European component was spread across Europe, from the Urals to the Atlantic, by the R1 Gravettians during the Paleolithic.
I did a K = 4 ADMIXTURE analysis of the Kennewick Man genome. He was 86% Amerindian and 14% Mongoloid. He didn’t have any additional Caucasoid admixture.
I find that surprising. Kennewick Man was mtdna X2. Many ancient European dna samples have turned out to be X2 and no East Eurasian ones have been, at least so far. Surely there must be some autosomal component he shares with Europeans. I wonder why it doesn’t pick that up at K = 4?
[…] of analyzing the Copper and Bronze Age genomes from El Portalón cave with a calculator based on my K = 17 ADMIXTURE analysis of prehistoric Eurasian […]