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Jefferson National Expansion Memorial
Dred Scott Courtroom
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| |  | | Did You Know? On September 10, 1804 on Cedar Island, in South Dakota, William Clark discovered the fossilized remains of the ribs, backbone and teeth of a plesiosaur. Plesiosaurs were animals who lived at the same time as the dinosaurs, but swam rather than walking on land. Clark thought it was a giant fish bone! more... | | |
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Last Updated: December 15, 2009 at 15:20 MST |