This analysis is consistent with the results from a previous study by Raghavan et al. (2014) which estimated that 14 to 38% of Native American ancestry may originate through gene flow from the ancient population associated with MA-1. MA-1 is basal to modern-day western Eurasians and it carried mtDNA haplogroup U, which is common among European hunter-gatherers. But European admixture detected in Chinchorro DNA samples does not translate into typical European physical traits. According to Fu et al. (2016), MA-1 completely lacks light-skin mutations such as SLC45A2, SLC24A5 and HERC2.
First,
I was the first person to ever show using DNA that all Amerindians are Mongoloid-Caucasoid hybrids, and I did so
eight months before Willerslev and his associates took credit for "revealing" it in the 2014 paper that you mention, which was first published online in November 2013. I was attacked by Dienekes and regarded as a "kook" for saying so, at a time when everybody believed David Reich's preposterous claim that Northern Europeans are Mediterranean-Amerindian hybrids.
Second, the admixture, principal component, and qpAdm analyses are showing that the Chinchorro sample has a significant amount of Caucasoid admixture
beyond what all Amerindians received from their Mal'ta-like Y haplogroup Q male ancestors from Siberia. And they're showing that that
additional Caucasoid admixture is
not genetically related to the Y haplogroup R and Q Mal'ta and Afontova Gora people of Siberia, but instead to the Y haplogroup C1a2 and I Aurignacians and Gravettians of Western and Central Europe. The Europeans who contributed the additional Caucasoid admixture to the Chinchorro people must have crossed the Atlantic to arrive in the Americas. The Solutreans, who lived during the LGM, may have been more genetically similar to the pre-LGM Western European hunter-gatherers than to the post-LGM Western European hunter-gatherers, and of course there's a mountain of archeological evidence proving the presence of the Solutreans in the Americas. The Solutreans may well be the source of the additional Caucasoid admixture in the Chinchorro sample.
Third, the presence of European DNA in the Chinchorro sample which is distinct from the Mal'ta-related Siberian DNA found in all Amerindians is consistent with the physical features of the Chinchorro mummies, which are distinct from typical Amerindian features. There are numerous photographs of Chinchorro mummies in my
White Gods post from four years ago, and those photographs show that the Chinchorro people had wavy brown and chestnut European hair, and not stiff black Mongoloid Amerindian hair. They also show that many of the Chinchorro mummies have the narrow, oval faces typical of Europeans, and not the large, round, wide faces typical of Amerindians.