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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]
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.
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.
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)
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 ...
Grand Canyon Visitor Center on the South Rim of the Grand Canyon, and the Coconino Plateau beyond – in Grand Canyon National Park, Arizona. The Coconino Plateau is found south of the Grand Canyon and north-northwest of Flagstaff, in northern Arizona of the Southwestern United States.
Dana Butte's prominence spire is dull gray, sitting on gray debris on the platform, and is composed of weathered Supai Group Manakacha Formation, also a cliff-former rock. Dana Butte drains west into the Salt Creek (Grand Canyon) drainage, and east into the adjacent canyon of the terminus of Salt Creek.
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.