When was the western cordillera formed?
Answer:
65-3,980 million years old depending on where in the range you are talking about. See the detail here and at the links.
The Cordillera from Mexico northwards is also called the Western Cordillera in the United States and the Pacific Cordillera in Canada.
From north to south, this sequence of overlapping and parallel ranges begins with the Alaska Range and the Brooks Range in Alaska and run through the Yukon into British Columbia. The main belt of the Rocky Mountains along with the parallel Coast Ranges of mountains and islands continue through British Columbia and Vancouver Island. In the United States, the Cordillera branches to include the Rockies, the Sierra Nevada, and the Cascades and Coast ranges of Washington, Oregon, and California. In Mexico, the Cordillera continues through the Sierra Madre Occidental and Sierra Madre Oriental, as well as the backbone mountains of the Baja California peninsula.
The younger ranges of the Rocky Mountains uplifted during the late Cretaceous period (100 million-65 million years ago), although some portions of the southern mountains date from uplifts during the Precambrian (3,980 million-600 million years ago).
Not sure, since the Protozoic? Devonian? Depends what you mean by formed.
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