Nankoweap Formation
The Neoproterozoic Nankoweap Formation (pronounced Nan' coe weep), is a thin sequence of distinctive red beds that consist of reddish brown and tan sandstones and subordinate siltstones and mudrocks that unconformably overlie basaltic lava flows of the Cardenas Basalt of the Unkar Group and underlie the sedimentary strata of the Galeros Formation of the Chuar Group. The Nankoweap Formation is slightly more than 100 m in thickness. It is informally subdivided into informal lower and upper members that are separated and enclosed by unconformities. Its lower (ferruginous) member is 0 to 15 m thick. The Grand Canyon Supergroup, of which the Nankoweap Formation is part, unconformably overlies deeply eroded granites, gneisses, pegmatites, and schists that comprise Vishnu Basement Rocks.
Nankoweap Formation
The Neoproterozoic Nankoweap Formation (pronounced Nan' coe weep), is a thin sequence of distinctive red beds that consist of reddish brown and tan sandstones and subordinate siltstones and mudrocks that unconformably overlie basaltic lava flows of the Cardenas Basalt of the Unkar Group and underlie the sedimentary strata of the Galeros Formation of the Chuar Group. The Nankoweap Formation is slightly more than 100 m in thickness. It is informally subdivided into informal lower and upper members that are separated and enclosed by unconformities. Its lower (ferruginous) member is 0 to 15 m thick. The Grand Canyon Supergroup, of which the Nankoweap Formation is part, unconformably overlies deeply eroded granites, gneisses, pegmatites, and schists that comprise Vishnu Basement Rocks.
has abstract
The Neoproterozoic Nankoweap F ...... he Nankoweap – was recognized.
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Wikipage page ID
35,878,169
Wikipage revision ID
729,364,256
age
Neoproterozoic, <770 Ma
Caption
Venus Temple landform, NNW of ...... Basalt, above Dox Formation.
country
extent
Grand Canyon, Colorado River region
imagesize
namedby
Van Gundy , Van Gundy , and Maxson
namedfor
Nankoweap Canyon
period
Neoproterozoic
prilithology
sandstone, siltstone & shale
region
Arizona east Grand Canyon Lava Butte region on Colorado River, near Lipan Point
Thickness
approximate maximum
underlies
Chuar Group and, as part of the Great Unconformity, the Tapeats Sandstone
subject
comment
The Neoproterozoic Nankoweap F ...... omprise Vishnu Basement Rocks.
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label
Nankoweap Formation
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