- Usage in publication:
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- Carbon Butte Member
- Modifications:
-
- First used
- AAPG geologic province:
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- Plateau sedimentary province
Summary:
First use of the Carbon Butte Member of the Kwagunt Formation of the Chuar Group. Age is late Precambrian.
Source: GNU records (USGS DDS-6; Menlo GNULEX).
- Usage in publication:
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- Carbon Butte Member
- Modifications:
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- Revised
- Dominant lithology:
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- Sandstone
- Shale
- Mudstone
- AAPG geologic province:
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- Southern Rocky Mountain region
Summary:
Revised as lower member of Kwagunt Formation (new) of Chuar Group for Carbon Butte, west of Marble Canyon, its type section, west side of Colorado River, Coconino Co, AZ in the Southern Rocky Mountain region. Corresponds to Walcott's (1899) Division 6 and part of Division 7. Contains the only thick sandstone in the Chuar Group. Consists of red, even-grained, massive quartz sandstone with hematite pellicles which forms a prominent base and purple, gray, micaceous shale and mudstone. Purple-gray mudstone with thin siltstone lenses present to top of member. Overlies Duppa Member (new) of Galeros Formation (new) of Chuar. Underlies Awatubi Member (new) of Kwagunt. Is 251 ft thick at type, 198 ft thick in Nankoweap South Fork, and 188 ft in Kwagunt Creek. Of late Precambrian age. Geologic map.
Source: GNU records (USGS DDS-6; Denver GNULEX).
- Usage in publication:
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- Carbon Butte Member*
- Modifications:
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- Adopted
- AAPG geologic province:
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- Plateau sedimentary province
Summary:
Carbon Butte Member of the Kwagunt Formation of the Chuar Group of Ford and Breed (1973) is adopted as the Carbon Butte Member of the Kwagunt Formation of the Chuar Group of the Grand Canyon Supergroup. Age is late Precambrian.
Source: GNU records (USGS DDS-6; Menlo GNULEX).
- Usage in publication:
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- Carbon Butte Member*
- Modifications:
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- Age modified
- AAPG geologic province:
-
- Plateau sedimentary province
Summary:
Age of the Carbon Butte Member of the Kwagunt Formation is modified from late Precambrian to: Proterozoic Y.
Source: GNU records (USGS DDS-6; Menlo GNULEX).
- Usage in publication:
-
- Carbon Butte Member*
- Modifications:
-
- Age modified
- AAPG geologic province:
-
- Southern Rocky Mountain region
Summary:
Is the basal member of the Kwagunt Formation of the Chuar Group of the Grand Canyon Supergroup. Overlies Duppa Member of Galeros Formation of Chuar. Underlies Awatubi Member of Kwagunt. Is 49 m thick. Age changed form Proterozoic Y to Late Proterozoic, the age term applied to rocks younger than 900 and older than 570 Ma. Change in age designation made to Kwagunt and its Carbon Butte, Awatubi, and Walcott Members in the Southern Rocky Mountain region of northern AZ. Shown as younger than 850 Ma (est). Columnar section.
Source: GNU records (USGS DDS-6; Denver GNULEX).
For more information, please contact Nancy Stamm, Geologic Names Committee Secretary.
Asterisk (*) indicates published by U.S. Geological Survey authors.
"No current usage" (†) implies that a name has been abandoned or has fallen into disuse. Former usage and, if known, replacement name given in parentheses ( ).
Slash (/) indicates name conflicts with nomenclatural guidelines (CSN, 1933; ACSN, 1961, 1970; NACSN, 1983, 2005, 2021). May be explained within brackets ([ ]).