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On this day in Lewis & Clark history...

Under a gentle breeze, the Expedition makes 20 miles stopping about 6 miles before the present Snake Creek bridge crossing. Along the way, they collect fossilized bones from a plesiosaur, an aquatic dinosaur.

From the journals...

we landed and saw lying on the banks on the South side of the River, the Bones of a monstrous large Fish, the back bone of which measured, forty five feet long.

Joseph Whitehouse

Plesiosaurus dolichodeirus

Skeleten of a plesiosaurus dolichodeirus dinosaur

Photo by J. Dinkel. See more at the British Museum of Natural History.