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Geology, • 1/2/26 1.8 Billion Years Old: Inside the Vishnu Basement Complex Previous The Strange Geologic Forces That Created the Grand Canyon Next Inside a Tube of Lava: How These Strange Caves Form You Might Also Like Inside a Tube of Lava: How These Strange Caves Form How Elevation Affects Temperature Ponderosa pines in the Coconino National Forest The Grand Canyon Tonto Group Transgressive model 1887: Life, Loss & Justice in the Old-West