I blogged on the fossil finds in Colorado but somehow missed this one, so a tip of the Stetson to Loren Coleman for posting it on Cryptomundo - with a side reference to me :)
The dug which has produced bison, mammoth, and mastodon bones has also produced the first Colorado fossil of Jefferson's ground sloth. I'll quote Loren's excellent write up here:
"The species was the subject of the first and second scientific articles on fossils ever published in the United States. The generic name Megalonyx was proposed by future U.S. President Thomas Jefferson in 1797, based on fossil specimens of what later came to be called Megalonyx jeffersonii that he had received from western Virginia."
So, as someone pointed out, we have pretty much the whole cast of the Ice Age movies on hand.