History In Rocks Geologists can determine parts of the Earth's history by observing the outcrops of the canyon walls.
{"Image DocumentName": "History In RocksGeologists can determine parts of the Earth\u2019s history by observing the outcrops of the canyon walls.", "Image ImageDescription": "They can do this by following the law of Superposition. The geologists have found that the older the rocks, the farther down the cliff wall they will be. The younger the rocks, the further up the cliff wall they will be\u2026..(NO SCHIST) The bottom and the oldest rock in the canyon is Vishnu Schist. Tapeats Sandstone, Bright Angel Shale, Muav Limestone were all deposited during the Cambrian Period and make up the lover walls of the GC. Geologists believe that many of the periods between the Cambrian and the Mississippian Periods were eroded and worn away. They think that the Ordovician, Silurian, and Devonian periods were times of uplift and of great erosion in the canyon. The Mississippian Period was represented by Redwall Limestone. Redwall Limestone when the GC region was submerged under a shallow sea. The Supai Formation was deposited during the Pennsylvanian Period. The Permian Period was represented by the Hermit Shale, Coconino Sandstone, the Toroweap Formation, and the Kaibab Limestone. The Rocks labeled above make up the upper layers, or the newest rocks of the canyon. Kaibab Limestone is currently the very newest and the top of the Colorado Plateau. The Colorado Plateau is a part of the Grande Canyon\u2026\u2026(you don\u2019t have to write this bullet) All of the Schist above reveals more about the geologic history of the GC region.", "Image XResolution": "37", "Image YResolution": "37", "Image ResolutionUnit": "Pixels/Centimeter", "Image Software": "SlidePlayer", "Image YCbCrPositioning": "Centered"}