The Rocky Mountains are commonly defined as stretching from the Liard River in English. The United States definition of the Mountain, however, includes the Cabinet and Salish Mountains of Idaho and Montana.
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The younger ranges of the Rocky Mountains raised during the late Cretaceous period (99 million–64 million years ago), although some portions of the southern mountains date from uplifts during the Precambrian (3,880 million–599 million years ago).
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