Aboriginal North American Horse

I found the paper I was referring to; THE ABORIGINAL NORTH AMERICAN HORSE, which posits that the North American horse did not go regionally extinct to only reappear when it was reintroduced to the Americas by the Spaniards.  There are various reasons that I find this actually considerably more likely than the default status quo !SCIENCE! position on the question, but the reality is that without doing genetic testing of the remains of the slaughtered aboriginal horses, we'll never be able to tell for sure.

However, given the massive "oh, heck, we actually had it all wrong about horse domestication!" in Eurasia moments that we've recently had dropped in our laps, we shouldn't be surprised to find this myth, of the missing native horses, is vulnerable too.

Anyway, check out the paper.  I think it's both interesting and convincing.