When you're done reading, it let me know what you think.
I've read just a bit of the beginning so far, and found those iron and radioactive pellets embedded in chert, and pointing to a northern impact, quite interesting.
Topping and Firestone have split over this, which probably explains why Topping (the discoverer) isn't a co-author:
Update: Article Questioning Radiocarbon-dating Accuracy Draws Fire from Scientists
by Mammoth Trumpet Staff
March 2002
Volume 17, Number 2
http://www.centerfirstamericans.org/mt.php?a=61
"After the year that has elapsed since the article was published, however, the authors no longer agree about the events theorized in their article. Firestone's reply is printed below. Topping declined to respond, pending new experimental data."