Image: 2021 Revised USGS Geologic Stratigraphic Column of the Grand Canyon

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Description: 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.
Title: 2021 Revised USGS Geologic Stratigraphic Column of the Grand Canyon
Credit: 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
Usage Terms: Public domain
License: Public domain
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