Dinosaur Discoveries in North America

Early Dinosaur History in the United States

Where was an almost complete skeleton of an Apatosaurus (formerly known as a Brontosaurus) found in the United States?

In 1909, American paleontologist Earl Douglass (1862–1931) discovered an Apatosaurus skeleton in the Carnegie Quarry (now Dinosaur National Monument) on the border between Utah and Colorado. Through 1923, further excavations in this area uncovered the largest known concentration of Jurassic period dinosaurs in the United States.


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