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  2. Geology of the Grand Canyon area - Wikipedia

    en.wikipedia.org/wiki/Geology_of_the_Grand...

    An unconformity representing 40 to 50 million years of lost geologic history marks the top of this formation. [37] The next formation in the Grand Canyon geologic column is the cliff-forming Redwall Limestone, which is 400 to 800 feet (120 to 240 m) thick (see 4b in figure 1). [38]

  3. File:2021 Revised NPS Geologic Stratigraphic Column of the ...

    en.wikipedia.org/wiki/File:2021_Revised_NPS...

    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.

  4. File:Stratigraphy of the Grand Canyon.png - Wikipedia

    en.wikipedia.org/wiki/File:Stratigraphy_of_the...

    Summary This is an Adobe Fireworks file which saves bitmaps, layers, text, and vector paths in private chunks of the PNG file. Description Stratigraphy of the Grand Canyon.png

  5. Geology of Arizona - Wikipedia

    en.wikipedia.org/wiki/Geology_of_Arizona

    The Mesoproterozoic formations in the Grand Canyon are overlain by the 850 million year old, Neoproterozoic Chuar Group and Sixtymile Formation sedimentary rocks. The Great Unconformity is a famous gap in the stratigraphic record of the Grand Canyon of 900 million years between Proterozoic granitic rocks and Cambrian marine sediments. For the ...

  6. Grand Canyon - Wikipedia

    en.wikipedia.org/wiki/Grand_Canyon

    The Grand Canyon is part of the Colorado River basin, which has developed over the past 70 million years. [7] [20] For more than 150 years, scientists have gathered data, proposed new ideas, and debated sometimes contentious theories about the geologic origins of the Grand Canyon and the Colorado River. Formation of the Grand Canyon and the ...

  7. Grand Canyon Supergroup - Wikipedia

    en.wikipedia.org/wiki/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 .

  8. Great Unconformity - Wikipedia

    en.wikipedia.org/wiki/Great_Unconformity

    Geologic stratigraphic column of strata exposed in and near the Grand Canyon. The term Great Unconformity is frequently applied to the unconformity observed by John Wesley Powell in the Grand Canyon in 1869. [1] It is an exceptional example of relatively young sedimentary rock strata overlying much older sedimentary or crystalline strata.

  9. Tonto Group - Wikipedia

    en.wikipedia.org/wiki/Tonto_Group

    A geologic cross section of the Grand Canyon. [ 5 ] The Tonto Group is a name for an assemblage of related sedimentary strata , collectively known by geologists as a Group , that comprises the basal sequence Paleozoic strata exposed in the sides of the Grand Canyon.

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