America's Great Outdoors
During the Jurassic period - 149 million years ago - the area of Utah and Colorado that is now Dinosaur National Monument looked much different than today. Large rivers dominated the landscape, flowing from highlands in the south towards the north. A...

During the Jurassic period - 149 million years ago - the area of Utah and Colorado that is now Dinosaur National Monument looked much different than today. Large rivers dominated the landscape, flowing from highlands in the south towards the north. A savannah environment surrounded the river courses, but instead of a grassland, these savannahs featured ferns and conifers. Living on those verdant plains, dinosaurs like apatasaurus, diplodocus and stegosaurus grazed while avoiding the predatory allosaurus. The remarkable fossils of these ancient animals gave the park its name. Photo by National Park Service.

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