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off the Chalumna River (now Tyolomnqa)
Marshy areas surrounded the lakes
including the advent of predators or being out-competed by the more effective Cambrian organisms
Another idea was that the shark would swim into a school of fish and fling out the jaw
Megalonyx jeffersoni, ground sloth skeleton T-Rex off the Chalumna River (nowPresident, 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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