The same lake beds as the Kemmerer quarries, but this side is federal and protected, and it holds the best of it: complete stingrays, birds, a horse the size of a dog, palm fronds, all from a subtropical lake that sat here for two million years. The visitor centre has spectacular material on the wall and a research quarry you can watch in summer. LOOK ONLY. Collecting anything here is a federal offence.
Fish, stingrays, birds, an entire lake · Eocene, ~52 mya
See it on the map
Other places on the map within a couple of hours.