Mountain-building activity in the present-day Rocky Mountains occurred during which phase of the Cordilleran orogeny?

Question

Quizplus · Accepted Answer

The Rocky Mountains were formed during the Laramide orogeny, which occurred from approximately 80 to 55 million years ago. This was the last major episode of mountain-building in the Cordilleran orogeny, which spanned from the late Precambrian to the Cenozoic era. The other orogenies listed (Sonoma, Nevadan, Sevier, and Franciscan) occurred during earlier phases of the Cordilleran orogeny and did not contribute significantly to the formation of the Rockies.

Mountain-Building Activity in the Present-Day Rocky Mountains Occurred During Which