16.06.2021 | History

5 edition of Geology of the Grand Canyon found in the catalog.

Geology of the Grand Canyon

a guide and index to published graphic and tabular data (excluding paleontology)

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  • 759 Currently reading

Published by Administrator in Geological Society of America

  • United States
    • Subjects:
    • Geological Society of America

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      • Includes bibliographical references and indexes.Cross-indexed to: Geology of the Grand Canyon : an annotated bibliography.

        StatementGeological Society of America
        PublishersGeological Society of America
        LC Classifications1990
        The Physical Object
        Paginationxvi, 56 p. :
        Number of Pages80
        ID Numbers
        ISBN 100813760216
        3Microform publication ;

        nodata File Size: 2MB.

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Geology of the Grand Canyon by Geological Society of America Download PDF EPUB FB2

The Rio Grande Rift runs south to north from the state of Chihuahua, Mexico, to Leadville, Colorado. The Colorado River, then, must have been carrying eroded rock materials from the Plateau to its mouth by 5 million years ago.

If you've made changes, tell the reviewer what changes you made. Bronze markers on the trail mark your location in time. The oldest, crystalline rocks are chiseled into the craggy cliffs of the Granite Gorges.

Geologic Formations

The Grand Canyon region gently slopes southward, so water on the North Rim flows into the canyon and water on the South Rim tends to flow away. An unconformity marks the top of this formation. Supai Group was deposited in late Mississippian, through the Pennsylvanian and into the time, some 320 million to 270 million years ago.

The formation was deposited in a warm, shallow sea as the shoreline transgressed invaded and regressed retreated over the land. The Colorado River through Grand Canyon averages 300 feet 91 m across and about 40 feet 12 m deep. Basins dropped down and mountain ranges rose up between old and new north—south—trending faults. Grand Canyon and Colorado River: The Colorado River, or some ancestor to it, has carved the Grand Canyon.

Any rocks that were deposited on top of the Grand Canyon Supergroup in the Precambrian were completely removed. Geologists do not know if sediments were deposited in these periods and were later removed by erosion or if they were never deposited in the first place.

Vishnu schist as displayed on the Trail of Time.