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The oldest rock is Precambrian metamorphic rock that forms the core of the North American continent.There is also Precambrian sedimentary argillite, dating back to 1.7 billion years ago.Within the North American Cordillera, the Rockies are somewhat distinct from the Pacific Coast Ranges and the Cascade Range and Sierra Nevada, which all lie further to the west.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.The Great Basin and Columbia River Plateau separate these sub-ranges from distinct ranges further to the west, most prominent among which are the Sierra Nevada, Cascade Range and Coast Mountains.

", is given as, when seen from across the prairies, they looked like a rocky mass.The range's highest peak is Mount Elbert located in Colorado at 14,440 feet (4,401 m) above sea level.Mount Robson in British Columbia, at 12,972 feet (3,954 m), is the highest peak in the Canadian Rockies.Human population is not very dense in the Rocky Mountains, with an average of four people per square kilometer and few cities with over 50,000 people.However, the human population grew rapidly in the Rocky Mountain states between 19.

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The Muskwa and Hart Ranges together comprise what is known as the Northern Rockies (the Mackenzie Mountains north of the Liard River are sometimes referred to as being part of the Rocky Mountains but this is an unofficial designation).

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