where do the rocky mountains end
The Rocky Mountains were initially formed from 80 million to 55 million years ago during the Laramide orogeny, in which a number of plates began to slide underneath the North American plate.lpine tundra occurs in regions above the treeline for the Rocky Mountains, which varies from 12,000 feet (3,700 m) in New Mexico to 2,500 feet (760 m) at the northern end of the Rocky Mountains (near the Yukon). The USGS defines ten forested zones in the Rocky Mountains.