Dinosaur Discoveries in North America

Early Dinosaur History in the United States

What early United States expedition mentioned a giant leg bone that was probably from a dinosaur?

The early United States expedition was that of army officers Meriwether Lewis (1774–1809) and William Clark (1770–1838)—the two explorers sent out by President Thomas Jefferson (1743–1826) to find a northwest passage to the Pacific Coast. In 1806 the explorers recorded finding a giant leg bone near Billings, Montana; it was almost certainly that of a dinosaur.


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