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Contents of 12.9 What were the consequences of plate motion over geologic time?

• A convergent boundary along the west coast of N. America from the mid-Paleozoic to mid-Cenozoic caused faulting and folding, intrusion, and crystallization of batholiths, volcanoes, and formation of mineral deposits in the western U.S.
• Relative plate motions changed on the western U.S. boundary ~26 million years ago. Subduction continues offshore AK, WA, OR and NW CA, but transform boundaries formed elsewhere.

12.9 What were the consequences of plate motion over geologic time?