- Usage in publication:
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- Galeros Formation
- Modifications:
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- First used
- AAPG geologic province:
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- Plateau sedimentary province
Summary:
First use of the Galeros Formation of the Chuar Group. Consists of the (ascending) Tanner, Jupiter, Carbon Canyon, and Duppa Members. Age is late Precambrian.
Source: GNU records (USGS DDS-6; Menlo GNULEX).
- Usage in publication:
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- Galeros Formation
- Modifications:
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- Named
- Dominant lithology:
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- Limestone
- Dolomite
- Shale
- Sandstone
- Siltstone
- AAPG geologic province:
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- Southern Rocky Mountain region
Summary:
Named as the basal formation of the Chuar Group for Galeros promontory that overlooks the southern part of Chuar outcrops in Chuar and Carbon Canyons, west of the Colorado River, Coconino Co, AZ, Southern Rocky Mountain region. No type section designated. Overlies unconformably Nankoweap Group. Underlies Carbon Butte Member (new) of Kwagunt Formation (new), upper formation of Chuar Group. Is 4,272 ft thick. Divided into (ascending order): Tanner, Jupiter, Carbon Canyon, and Duppa Members, all newly named. Major lithologies of members include limestone, dolomite, shale, sandstone, and siltstone. Stromatolitic limestone occurs in the Jupiter and Carbon Canyon Members. Of late Precambrian age. [Galeros not described as a unit separate from its members.] Geologic map.
Source: GNU records (USGS DDS-6; Denver GNULEX).
- Usage in publication:
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- Galeros Formation*
- Modifications:
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- Adopted
- AAPG geologic province:
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- Plateau sedimentary province
Summary:
Galeros Formation of the Chuar Group of Ford and Breed (1973) is adopted as the Galeros 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:
-
- Galeros Formation*
- Modifications:
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- Age modified
- AAPG geologic province:
-
- Plateau sedimentary province
Summary:
Age of the Galeros Formation is modified from late Precambrian to: Proterozoic Y.
Source: GNU records (USGS DDS-6; Menlo GNULEX).
- Usage in publication:
-
- Galeros Formation*
- Modifications:
-
- Age modified
- AAPG geologic province:
-
- Southern Rocky Mountain region
Summary:
Is the basal formation of the Chuar Group of the Grand Canyon Supergroup. Unconformably overlies Nankoweap Formation. Underlies Kwagunt Formation of Chuar. Is 1,010 m thick. Age designation of Proterozoic Y changed to Late Proterozoic, the age term applied to rocks younger than 900 Ma and older than 570 Ma. Change in designation made to Galeros and its Tanner (base), Jupiter, Carbon Canyon, and Duppa Members in the Southern Rocky Mountain region of northern AZ. Span of Galeros shown as extending from 900 Ma (est) to 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 ([ ]).