Dinosaur National Monument

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This park contains fossils of dinosaurs. The rock layer enclosing the fossils is a ancient river bed from the Jurassic Period. The dinosaurs and other ancient animals were carried by the river system which eventually entombed their remains.

Dinosaur National Monument is located on the southeast flank of the Uinta Mountains on the border between Colorado and Utah at the confluence of the Green and Yampa Rivers. Although most of the monument area is in Moffat County, Colorado, the Dinosaur Quarry is located in Utah just to the north of the town of Jensen, Utah.

The dinosaur fossil beds (bone beds) were discovered in 1909 by Earl Douglass, a paleontologist working and collecting for the Carnegie Museum of Natural History.