File:2021 Revised USGS Geologic Stratigraphic Column of the Grand Canyon.jpg
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2021 Geologic stratigraphic column of strata exposed in and near the Grand Canyon showing newly recognized stratigraphic units, major unconformities, and changes in stratigraphic nomenclature and geochronology
Summary
editDescription2021 Revised USGS Geologic Stratigraphic Column of the Grand Canyon.jpg |
English: 2021 revision of the stratigraphic column of strata of the Grand Canyon region showing individual geologic formations and major unconformities that comprise three sets of strata; 1. Vishnu Basement Rocks, 2. Grand Canyon Supergroup, and 3. Layered Paleozoic Rocks. The major unconformities are the 1. Great Nonconformity, 2. Great Angular Unconformity, and 3. Great Unconformity. |
Date | |
Source | Karlstrom, K., L. Crossey, A. Mathis, and C. Bowman. 2021. Telling time at Grand Canyon National Park: 2020 update. Natural Resource Report NPS/GRCA/NRR—2021/2246. National Park Service, Fort Collins, Colorado. https://doi.org/10.36967/nrr-2285173. |
Author | U.S. Department of the Interior National Park Service Natural Resource Stewardship and Science Fort Collins, Colorado |
Camera location | 36° 18′ 00″ N, 112° 45′ 00″ W ![]() | View this and other nearby images on: OpenStreetMap | ![]() |
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