The main exposed part of the North American craton (Laurentia), which was assembled from at least five microcontinents between 1.95 and 1.85 billion years ago, is called the

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The Canadian shield is the main exposed part of the North American craton, which was formed by the collision and assembly of at least five microcontinents between 1.95 and 1.85 billion years ago. The Appalachian orogen and Cordilleran orogen are mountain ranges that formed much later, as a result of plate tectonic activity. The Colorado plateau is a large, elevated region in the southwestern United States that formed as a result of uplift and erosion.

The Main Exposed Part of the North American Craton (Laurentia)