- Usage in publication:
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- Bullwagon dolomite
- Modifications:
-
- Original reference
- Dominant lithology:
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- Dolomite
- Shale
- AAPG geologic province:
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- Permian basin
Summary:
Pg. 96, 97, pl. Bullwagon dolomite of Clear Fork group. Two distinct strata separated by a shale or clay parting. Thickness 2 to 5 feet. Thins to the north until it cannot be identified with certainty 35 miles north of Texas and Pacific RR. Lies 360 to 370 feet below Merkel dolomite. [Age is Permian.]
Named from Bullwagon Creek, Taylor Co., central northern TX. [Present in section measured along Texas and Pacific RR from Abilene, Taylor Co., to Sweetwater, Nolan Co., central northern TX.]
Source: US geologic names lexicon (USGS Bull. 896, p. 292).
- Usage in publication:
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- Bullwagon dolomite
- Modifications:
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- Revised
- AAPG geologic province:
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- Bend arch
- Permian basin
Summary:
Bullwagon dolomite. Is 36 feet thick on Colorado River, where it is represented by a number of thin dolomites and blue shales. Underlies Choza formation and overlies Vale formation. Age is Permian. [Other reports give thicknesses as great as 65 feet.]
Source: US geologic names lexicon (USGS Bull. 896, p. 292).
- Usage in publication:
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- Bullwagon dolomite member
- Modifications:
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- Revised
- AAPG geologic province:
-
- Bend arch
- Permian basin
Summary:
Pg. 169, 176, 181. Bullwagon dolomite member of Vale formation of Clear Fork group. Bullwagon dolomite here treated as top member of Vale formation, the definition of Vale formation being modified to that extent. Thickness varies from 5 feet (Taylor County, Texas) to 44 feet (Tom Green County, Texas). Contains few fossils, notably ammonoids, pelecypods, gastropods. Age is Permian.
Source: Publication; US geologic names lexicon (USGS Bull. 896, p. 292).
- Usage in publication:
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- Bullwagon dolomite member*
- Modifications:
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- [Adopted]
- AAPG geologic province:
-
- Bend arch
Summary:
Pg. 66 (fig. 1). Bullwagon dolomite member of Vale formation of Clear Fork group. Rank reduced to member status. Age is Permian (Leonard).
Source: US geologic names lexicon (USGS Bull. 1200, p. 532).
- Usage in publication:
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- Bullwagon Dolomite [Member]
- Modifications:
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- Areal extent
- AAPG geologic province:
-
- Permian basin
Summary:
Area of report is north-central TX, approximately between the Brazos and Red Rivers; in this area the Choza, Vale, and Arroyo Formations of Clear Fork Group of the Colorado River Valley of TX are not distinguishable. [Author maps Clear Fork Group undivided, except for "Merkel Dolomite" and "Bullwagon Dolomite", some sandstone beds, and "Lytle Limestone". Listed in descending order: Merkel is topmost member of Choza Formation, Bullwagon is topmost member of Vale Formation, and Lytle is a middle member of Arroyo Formation, all of Clear Fork Group of the Colorado River Valley.] Bullwagon is described as "light gray to white, fine grained, thin bedded in units 1 to 2 feet thick, interbedded with red mudstone and siltstone within a zone of about 15 ft thick". Bullwagon is restricted to southern Haskell Co, TX in Permian basin. Is assigned to the Leonard Series [Early Permian]. Geologic map.
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 ([ ]).