X2a

In the dead of night, Razib Khan dropped this bombshell: Antonio Arnaiz-Villena et al. "The Origin of Amerindians: A Case Study of Secluded Colombian Chimila, Wiwa, and Wayúu Ethnic Groups and Their Trans-Pacific Gene Flow". Wew.

Colombia by dint of its mountains and relative (to Peru) isolation has preserved its preColumbian tribes better than most. It happens these groups although not enduring spill-in, have spilled out: Chimila / Shimizya and Wiwa are Chibchan; Wayúu / Guajiro(s) are Arawaks. (Also brought here are Barranquilla, whence Rachel Zegler's mother's mother: creoles. Maybe as a statistic control.)

The Barranquilla, if a control, cluster with the Danes meaning, the Dutch and English - not with the Spanish, oddly (were they brought from Jamaica?). As to the natives: let's start with the Chibchan-speaking Wiwa. These are like Arhuacos and, at another remove, the Maya. The Aymara "Inca" are at a more-distant remove. This suggests an ancient barrier just north of the equator, or "ecuador" if you will, also noted by Pizarro's men in their difficult journey to the Tawantinsuyú. For the Chibchan, at least their canoes could sometimes get past the Darien northward. And of course the Arawaks went nuts over the Caribbean. The southern Quechua then Mapuche are early branchoffs - but earlier than I'd think (see below).

Chimila are their own whole branch of Amerinds, before the Na-Dene arrived. Like, a preQuechua break. That means they are unrelated to the far-foraging Wiwa. Which spoke Chibchan first?

Also surprising: the Wayúu sort of Arawak cluster with the Guaraní, together branching right after the Mapuche. I'm not seeing that the great north-Andean empires transferred peoples north on this scale. This looks like the Guaraní did their own great trek southward, as did the Aymara.

Na-Dene aside, North American groups all cluster with those South after the Arawak split. I can explain this only by the Clovis revolution. Chimila, Arawak-Guaraní, Quechua, and of course Mapuche would then be relicts of the older Americas.

Which brings us to the stinkbomb: X2a and X2j. X2 is Eurasian ancestress "Xenia"; X2a and X2j are sisters. Problem: X2a is American. Arnaiz-Villena's crew is bringing back Across Atlantic Ice, of pre#woke White Apocalypse notoriety (keeping in mind the Solutreans are not Whites As We Know Them, and anyway mine own Bell-Beaker maternities have no X2). If we don't like That Sort, we can have Baxter and/or Loewen for alternative with Americans showing up in Ice Age Europe.

I, needless to say, dislike either option. But the facts are the facts. If they are facts. We'll need reproduction of these findings.