1.7 billion years ago, a portion of the rocks within the Rocky Mountains range were formed with Precambrian sedimentary argillite. A series of high level tectonic activity created the Rocky Mountains, after the rocks were formed. The last tetonic formation contributing to the formation of the mountains occurred 80 million years ago during the Laramide Origeny. The Rockies are part of a larger mountain system called the North American Cordillera.
Decades, after the Kansas Territory was turned into multiple states, The Rocky Mountain National Park was established by an act of Congress in 1915.
The park has the highest elevated road that exists in the continental United States.
At the eastern base of the Rocky Mountains, near Boulder, is the Estates State Park.