Megalonyx jeffersoni, ground sloth juvenile skull, Now The West Virginia State Fossil Kentrosaurus The chalk beds of western

The chalk beds of western Kansas

grinding up the food

Perchoerus is one of the rarest of the mammal fossils found in the White River Badlands and is much rarer than the cats and nimravids from the same area

The strange-looking reconstruction was soon confirmed

or onto their own bodies

Megalonyx jeffersoni, ground sloth juvenile skull, Now The West Virginia State Fossil Kentrosaurus The chalk beds of westernPresident, Thomas Jefferson, scientifically described fossil bones given to him by saltpeter miners found in a Monroe County cave in 1797. Jefferson thought they were the claws of a giant cat. In 1799 Casper Wistar re described the bones as a new species of extinct giant ground sloth and named it in honor of President Jefferson. Only recently have the bones been Carbon 14 dated at over 38,000 year old. On March 8, 2008 Megalonyx jeffersoni became the