I just finished reading this book, “The Cyclle of Cosmic Catastrophes.....”, and the authors demonstrate over and over and over (ad nauseum) if fervent pieces of evidence from all over North America (particularly) that there was, in fact, some impact that sprayed debris across the continent. The author also points out that it was not only the large mammals that disappeared at precisely the same time, but tiny little rodents that would be pretty hard for man to extinguish. This article is barely a snippet of what is in the book. It left me as a believer.
Thanks Explorer89.