Time for THE BOOK. The first part of the article says there are no craters. Obviously they have never seen the picture of the bottom of Lake Michigan with either 2 or 3 craters. Two at either end of the lake and a small one between them. Also, in a quick read I did not see anything about the Carolina Bays which may have been caused when gigantic ice chunks were thrown off as Lake Michigan bolides hit. The fact that the trajectory lines converge to one side of Lake Michigan can be explained by the amount the earth rotated while the chunks were in the air while traveling to their landing sites. Why do these scientists have to keep reinventing the wheel when Firestone and his crowd did such a good job. They should be building on this work, not theorizing from scratch. As to missing mega-fauna. The Clovis people pretty much disappeared. Probably all big animals were not killed off then, but on the other hand were so reduced in abundance that as the human population reinvigorated, they were finally killed off.
I hope I posted it already, but it’s possible that I was sleep surfing and dreamed the whole thing. ;^)