Colorado State University Ram Web
During the late 19th century era known as the Gilded Age, paleontologists Othniel Charles Marsh and Edward Drinker Cope engaged in a bitter competition to find and describe dinosaur fossils. In trying to outdo each other, they introduced a combined 136 new species that included such well-known genera as Stegosaurus, Triceratops, Diplodocus, Coelophysis, Apatosaurus/Brontosaurus and Allosaurus.
The latter of these was first discovered in Jurassic-aged sediments in Colorado. Countless additional samples were later recovered in Utah, particularly from deposits at the Cleveland-Lloyd Dinosaur Quarry in Emery County.
Othniel Marsh Names Allosaurus
In 1869 Ferdinand Hayden, distinguished for his leadership of several surveying expeditions through the west, acquired a bone from Middle Park, Colorado. Locals referred to the fossil as a petrified horse hoof, but eminent paleontologist Joseph Leidy identified it as a partial vertebra from a dinosaur, referring it in 1870 to the genus Poekilopleuron (spelling it as Poicilopleuron). Later that year Leidy changed his identification, attributing the specimen to a new genus that he named Antrodemus.
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