Grand Canyon, Arizona Scale Model at Park Headquarters Cabins Located at South Rim View from Cabin Window On the Bright Angel Trail Trail Switchback Make Way for the Mules Park Rangers View from Bright Angel Descent Downward View of Descent Approach of Precambrian Inner Gorge • Precambrian History: • Deposition of Shale, Metamorphism to Vishnu Schist • Intrusion of Granite, Erosion of Precambrian Mountains • Deposition of Grand Canyon Series (Nonconformity) • Precambrian History: • Tilting of Grand Canyon Series, Erosion of Grand Canyon Series • Deposition of Cambrian Tonto Group (Angular Unconformity) • View of Precambrian Pink Zorester Granite • View of Precambrian Vishnu Schist from Plateau Point Paleozoic Section Precambrian • Ascending from inner gorge into the Paleozoic Section • Looking back at the Inner Gorge Trailhead • Contact between the Cambrian Tonto Group and Devonian Erosional Remnant • Contact represents a Disconformity. • What Periods of Time are Missing? Devonian Cambrian • Contact between the Cambrian and Devonian Periods Redwall Limestone • Carboniferous Redwall Limestone • Bright Angel Trail switchbacking through Redwall Limestone Permian Supai Formation • Permian Supai Formation on Carboniferous Redwall Limestone Coconino Ss and Hermit Shale Contact Permian Coconino Sandstone Formation Permian Hermit Shale Formation • The contact between the Hermit Shale and Coconino Sandstone represents a marine regression • The Coconino Sandstone was deposited in a desert environment and contains reptilian footprints • Permian Coconino Sandstone • Coconino Cross-Bedded Sandstone • Cross-Bedding • Trail View from the Coconino Formation • Kaibab represents a marine transgression • Coconino, Supai, and Redwall Limestone Formations represent a marine regression • Back to the Cabin before the Monsoon .