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Lewis and Clark

In a journal entry in 1803, Lewis (of Lewis and Clark) wrote of finding a 42
foot long "perfectly petrified" vertebrae in the shale on the south side of
the Missouri river in what is now South Dakota, just north of the
Nebraska-So. Dakota border. He excavated pieces of the bone and sent them to
Thomas Jefferson.

The bedrock in that area is upper Cretaceous shale and chalk. Although Lewis
wrote that the backbone "tapered towards the tail". He thought it was a
"fish", but I'm wondering if it may have been a dinosaur or one of the
species of marine reptiles around at the time.  Any speculation on what it
may have been? Unfortunately, that's all the information he provided.