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  2. Geology of the Grand Canyon area - Wikipedia

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

    The resulting Grand Canyon Supergroup of sedimentary units is composed of nine varied geologic formations that were laid down from 1.2 billion and 740 million years ago in this sea. [11] Good exposures of the supergroup can be seen in eastern Grand Canyon in the Inner Gorge and from Desert View, Lipan Point and Moran point. [12] [note 1]

  3. Tonto Group - Wikipedia

    en.wikipedia.org/wiki/Tonto_Group

    Figure 1. 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.

  4. Great Unconformity - Wikipedia

    en.wikipedia.org/wiki/Great_Unconformity

    The Great Unconformity of Powell in the Grand Canyon is a regional unconformity that separates the Tonto Group from the underlying, faulted and tilted sedimentary rocks of the Grand Canyon Supergroup and vertically foliated metamorphic and igneous rocks of the Vishnu Basement Rocks.

  5. List of Supai Group prominences in the Grand Canyon

    en.wikipedia.org/wiki/List_of_Supai_Group...

    This is a list of Supai Group prominences in the Grand Canyon. Landforms with up to 4 units of Supai Group, as prominences. The rock unit sequences are as follows: Coconino Sandstone, (prominence, Permian unit) Hermit Shale, Permian; Supai Group, (4 units, Pennsylvanian-Permian) 4 – Esplanade Sandstone, (Permian)

  6. Toroweap Formation - Wikipedia

    en.wikipedia.org/wiki/Toroweap_Formation

    The Middle Permian Toroweap Formation is a thin, darker geologic unit, between the brighter colored units of the Kaibab Limestone above, and Coconino Sandstone below. It is a prominent unit in Grand Canyon, Arizona, Southwestern United States, found through sections of the South Rim, Grand Canyon, and the North Rim, of the Kaibab Plateau; also the Kaibab's southeast extension to Cape Royal ...

  7. Man sues Grand Canyon for not letting him study its rocks - AOL

    www.aol.com/news/2017-05-19-man-sues-grand...

    A geologist is suing the landmark because park authorities wouldn’t allow him to remove a bunch of rocks from the site to aid in his research. Man sues Grand Canyon for not letting him study its ...

  8. Grand Canyon Supergroup - Wikipedia

    en.wikipedia.org/wiki/Grand_Canyon_Supergroup

    Bass Formation(finely-layered, dark slopes), sitting on top of (base units). Vishnu Basement Rocks (black stratum) within the Granite Gorge and side canyons. The Grand Canyon Supergroup is a Mesoproterozoic to a Neoproterozoic sequence of sedimentary strata, partially exposed in the eastern Grand Canyon of Arizona.

  9. Video shows Grand Canyon park visitors seek refuge in cave ...

    www.aol.com/video-shows-grand-canyon-park...

    The flash flood struck Havasu Canyon, a tributary canyon, about 30 miles west of Grand Canyon Village, Arizona just before 1:30 p.m. on Thursday, USA TODAY reported.

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