Nice page.
FWIW, If you pick the link to this page from there:
http://www.uky.edu/KGS/coal/webfossl/fosslbig.htm
(which takes you to the 'Fossils of Kentucky' page, there is a nice set of links at the bottom there, but one of them (for mass extionctions) is broken:
http://superior.carleton.ca/~tpatters/Museum/extinction/homepg.html
After a bit of poking around, I found that it should be:
http://www.wf.carleton.ca/Museum/extinction/
homepg.html
I guess the 'Fossils of Kentucky' page is run by someone else (the Kentucky Geological Survey? maybe?), but you might want to pass this correction on to Mr. Chestnut, or them.
HTH. HAND.