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  2. Grand Canyon Forest Reserve - Wikipedia

    en.wikipedia.org/wiki/Grand_Canyon_Forest_Reserve

    The Grand Cañon Forest Reserve was established by the United States General Land Office in Arizona on February 20, 1893 with 1,851,250 acres (7,491.7 km 2).It was renamed Grand Canyon on August 8, 1906 and transferred to the U.S. Forest Service becoming a National Forest on March 4, 1907.

  3. Grand Canyon - Wikipedia

    en.wikipedia.org/wiki/Grand_Canyon

    The Grand Canyon [a] is a steep-sided canyon carved by the Colorado River in Arizona, United States.The Grand Canyon is 277 miles (446 km) long, up to 18 miles (29 km) wide and attains a depth of over a mile (6,093 feet or 1,857 meters).

  4. Bass Formation - Wikipedia

    en.wikipedia.org/wiki/Bass_Formation

    Dolomite and limestone dominate the Bass Formation in the central part of the Grand Canyon, while the sandstone, conglomerate, and argillite dominate the Bass Formation in the eastern part of the Grand Canyon. The Bass Formation typically becomes generally finer grained toward the top. [2] [5] [6] [7] Volcanic ash layers occur in the Bass ...

  5. Grand Canyon National Park - Wikipedia

    en.wikipedia.org/wiki/Grand_Canyon_National_Park

    Grand Canyon National Park is a national park of the United States located in northwestern Arizona, the 15th site to have been named as a national park.The park's central feature is the Grand Canyon, a gorge of the Colorado River, which is often considered one of the Wonders of the World.

  6. Cardenas Basalt - Wikipedia

    en.wikipedia.org/wiki/Cardenas_Basalt

    The Grand Canyon Supergroup, of which the Unkar Group is the lowermost part, overlies deeply eroded granites, gneisses, pegmatites, and schists that comprise Vishnu Basement Rocks. [3] [5] [6] The Cardenas Basalt has also been called the Rama Formation.

  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. Hakatai Shale - Wikipedia

    en.wikipedia.org/wiki/Hakatai_Shale

    The sills range in thickness from 23 m (75 ft) at Hance Rapids, eastern Grand Canyon, to 300 m (980 ft) in Hakatai Canyon in the Shinumo Creek area. The feeder dikes to these sills are not exposed. However, the feeder dikes for the Cardenas Basalt can be traced, discontinuously, to within a few meters of its base.

  9. 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 ...

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