Natural Features & Ecosystems
In 1915, President Woodrow Wilson established Dinosaur National Monument to preserve "an extraordinary deposit of Dinosaurian and other gigantic reptilian remains of the [Jurassic] period, which are of great interest and value …" Twenty-three years later, President Franklin Roosevelt added more than 200,000 acres to the monument to protect the river corridors and adjacent viewsheds for the major canyons of the Green and Yampa rivers.
Did You Know?
Dinosaurs became extinct 65 million years ago, but lizards are still a common sight at Dinosaur National Monument. The small, inquisitive reptiles have endured on Earth for more than 300 million years, far outlasting their giant cousins.