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- Usage in publication:
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- Allen Ranch Breccia Member
- Modifications:
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- Original reference
- Dominant lithology:
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- Limestone
- AAPG geologic province:
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- Permian basin
Summary:
Pg. 40. Allen Ranch Breccia Member of Segovia Formation [of Edwards Group]. Chiefly limestone. Thickness 7 m at type locality. Overlies Burt Ranch Member; underlies "Gryphaea" bed member, both of Segovia Formation. Age is Early Cretaceous (Comanchean).
Type locality: roadcuts on U.S. Highway I-10, 1.6 km west of intersection with U.S. Highway 290, Kimble Co., TX. Named from exposures in bed of Allen Creek, on Allen Ranch, east of U.S. Highway 83, Kimble Co., TX.
Source: US geologic names lexicon (USGS Bull. 1520, p. 7).
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 ([ ]).