This is a pair of nicely preserved fossil fish collected from Warfield's Quarry near Kemmerer, Wyoming. The larger of the two fish is a 5.75" long Diplomystus dentatus and the smaller one is a 2.35" Knightia eocaena. There is also a coprolite (fish poop) and larger scale present on the rock.
This specimen includes an acrylic display stand.
50 million years ago, in the Eocene these fish thrived in Fossil Lake fed by Uinta and Rocky Mtn. highlands. The anoxic conditions at the bottom of Fossil Lake slowed bacterial decomposition, prevented scavengers from disturbing corpses, and most interestingly, suffocated creatures that ventured into the oxygen-starved aquatic layer. The result is a miraculous exhibition of Eocene biota in a subtropical, aquatic community within sycamore forests teeming with creatures such as freshwater stingrays, dog-sized horses, menacing alligators, early flying bats, and one of the first primates.