Erosion of the canyon occurred in the Cenozoic.īy the end of this chapter, students should be able to: The rocks are Permian in age, and formed in the desert conditions that dominated North America toward the end of the Paleozoic through the middle Mesozoic. Spider Rock, within Canyon de Chelly National Monument, not only has a long human history with the Diné tribe, but also has a long geologic history.
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