{{{SNORT}}} From Firestone et al's book, best I recall is they were trying, amongst other things probably, to explain the disappearance of a species or two around the time period they were studying. I thought the book was fairly compelling, although it got a tad technical in places. In any case, after a quick read of this article I didn't notice any theories this group of skeptics offered by way of explanation. And their best refutation appeared to consist primarily of sour grapes...
It appears to be another in a series of repetitive hatchet jobs. Kudos to the various media nimrods who regurgitate the phony critiques. :’)
The embedded particles, black mat, and sudden extinction (which included the short-lived Clovis culture) are real. The researchers didn’t make ‘em up, or pull ‘em out of their nether regions. :’)