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Unkar Group
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The Unkar Group is a sequence of strata of Proterozoic age that are subdivided into five geologic formations and exposed within the Grand Canyon, Arizona, Southwestern United States. The Unkar Group i
Cardenas Basalt and Dox Formation of the Unkar Group Reddish Dox Formation below blackish Cardenas Basalt, upstream from Tanner Graben
Cardenas Basalt and Dox Formation of the Unkar Group Reddish Dox Formation below blackish Cardenas Basalt, upstream from Tanner Graben
Figure 1. A geologic cross section of the Grand Canyon.
Figure 1. A geologic cross section of the Grand Canyon.
Close-up of Apollo Temple showing angular unconformity between Tonto Group and Unkar Group
Close-up of Apollo Temple showing angular unconformity between Tonto Group and Unkar Group
Shinumo Quartzite cliffs upon colorful Hakatai Shale upon horizontal thin beddings of Bass Formation (upon Vishnu Basement Rocks of Granite Gorge) (ex
Shinumo Quartzite cliffs upon colorful Hakatai Shale upon horizontal thin beddings of Bass Formation (upon Vishnu Basement Rocks of Granite Gorge) (expandable high-resolution photo)
Great Unconformity
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The Great Unconformity is the unconformity observed by John Wesley Powell in the Grand Canyon in 1869. It is an exceptional example of relatively young sedimentary rock strata overlying much older sed
Unkar Group
…classic example of an ancient peneplain. The contact between the Tonto Group and Unkar Group is a prominent angular unconformity, which is part of the Great Unconformity. The surface of this angular unconformity truncates dipping strata comprising the folded and faulted Unkar Group. Though this surface is typically a…
Powell's Unconformity viewed from Lipan Point on the South Rim. Rocks of the Unkar Group of the Grand Canyon Supergroup are truncated at the base of t
Powell's Unconformity viewed from Lipan Point on the South Rim. Rocks of the Unkar Group of the Grand Canyon Supergroup are truncated at the base of the Tonto Group.
Powell's Unconformity seen from Hopi Point on the South Rim. Steeply foliated and veined schists of the Vishnu Basement Rocks truncated at the base of
Powell's Unconformity seen from Hopi Point on the South Rim. Steeply foliated and veined schists of the Vishnu Basement Rocks truncated at the base of the Tonto Group.
An exposure of Powell's Great Unconformity, west of Montezuma, New Mexico
An exposure of Powell's Great Unconformity, west of Montezuma, New Mexico