Grand Canyon Supergroup
The Grand Canyon Supergroup is a Mesoproterozoic to a Neoproterozoic sequence of sedimentary strata, partially exposed in the eastern Grand Canyon of Arizona. This group comprises the Unkar Group, Nankoweap Formation, Chuar Group and the Sixtymile Formation, which overlie Vishnu Basement Rocks. Several notable landmarks of the Grand Canyon, such as the Isis Temple and Cheops Pyramid, and the Apollo Temple, are surface manifestations of the Grand Canyon Supergroup.
| Grand Canyon Supergroup | |
|---|---|
| Stratigraphic range: | |
| Type | Supergroup |
| Sub-units | 3. Chuar Group 2. Nankoweap Formation 1. Unkar Group |
| Underlies | Tonto Group, which is separated from it by the Great Unconformity |
| Overlies | Vishnu Basement Rocks |
| Thickness | 11,500 ft (3,500 m) to 13,100 ft (4,000 m) |
| Location | |
| Country | United States of America (Southwestern United States) |
| Type section | |
| Named for | Grand Canyon |
| Named by | (Walcott, 1883, 1894) |
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