- Usage in publication:
-
- Tanner Member
- Modifications:
-
- First used
- AAPG geologic province:
-
- Plateau sedimentary province
Summary:
First use of the Tanner Member of the Galeros Formation of the Chuar Group. Age is late Precambrian.
Source: GNU records (USGS DDS-6; Menlo GNULEX).
- Usage in publication:
-
- Tanner Member
- Modifications:
-
- Revised
- Dominant lithology:
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- Dolomite
- Shale
- AAPG geologic province:
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- Southern Rocky Mountain region
Summary:
Revised as the basal member of Galeros Formation (new) of Chuar Group for Tanner Rapids, west of Colorado River in Basalt Canyon (its type section), Coconino Co, AZ in the Southern Rocky Mountain region. Consists of 60 ft of cream-colored, massive, coarsely crystalline dolomite, at base, and an overlying 580 ft of blue-gray, micaceous shale. A thin (1-2 ft) fine-grained limestone separates the dolomite from the limestone. A few thin (1 in to 2 ft) scattered siltstone beds are ripple marked and mud cracked. Unconformably overlies sandstones of the Nankoweap Group. Underlies the Jupiter Member (new) of the Galeros. Upper contact placed at base of prominent stromatolitic limestone bed of Jupiter. Of late Precambrian age. Geologic map. Corresponds to Walcott's (1899) Division 1a and Division 9 and Hinds (1935) Division 1 and part of Division 2.
Source: GNU records (USGS DDS-6; Denver GNULEX).
- Usage in publication:
-
- Tanner Member*
- Modifications:
-
- Adopted
- AAPG geologic province:
-
- Plateau sedimentary province
Summary:
Tanner Member of the Galeros Formation of the Chuar Group of Ford and Breed (1973) is adopted as the Tanner Member of 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:
-
- Tanner Member*
- Modifications:
-
- Age modified
- AAPG geologic province:
-
- Plateau sedimentary province
Summary:
Age of the Tanner Member of the Galeros Formation is modified from late Precambrian to: Proterozoic Y.
Source: GNU records (USGS DDS-6; Menlo GNULEX).
- Usage in publication:
-
- Tanner Member*
- Modifications:
-
- Age modified
- AAPG geologic province:
-
- Southern Rocky Mountain region
Summary:
Is the basal member of Galeros Formation of Chuar Group of Grand Canyon Supergroup. Unconformably overlies Nankoweap Formation. Is 156 m thick. Age designation of Proterozoic Y changed to Late Proterozoic, the term applied to rocks younger than 900 Ma and older than 570 Ma. Change in age designation made to Galeros and its Tanner, Jupiter, Carbon Canyon, and Duppa Members in the Southern Rocky Mountain region of northern AZ. 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 ([ ]).