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Mexico and the United States
naming it for the "dental pavement" on both the upper and lower jaws
grinding up the food
The chalk beds of western Kansas
Megalonyx jeffersoni, ground sloth juvenile skull, Now The West Virginia State Fossil Kentrosaurus Mexico and the United StatesPresident, 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
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