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On December 9
Scientific Name: Archaeotherium (megachoerus) zygomaticus Location: South Dakota
Pachycephalosaurus was one of the last non-avian dinosaurs before the Cretaceous extinction event
an amphibian
The original is in the British Museum: the skull in the Medical College of Charleston
Megalonyx jeffersonii, ground sloth Arm & Hand Stegosaurus On December 9Left ulna, radius and hand of Megalonyx jeffersonii. 33 inches long with 13 inch hand width Megalonyx jeffersonii Jefferson Ground Sloth West Virginia State Fossil President, 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
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