[Bernard Marx]

That's interesting. I don't know how much of the information at this link is fact vs. speculation but there's definitely evidence of pygmy mammoths in the U.S. -- but apparently at a much earlier date.

Channel Island Pygmy Mammoths

[wendy1946]

Mammoths and creatures normally viewed as ice-age megafauna are just one part of it. You have accurate depictions of known dinosaur types in Amerind petroglyphs and artwork.