Usage:
Allen Ranch Breccia Member of Segovia Formation of Edwards Group (TX)
Geologic age:
late Early Cretaceous (Albian; Comanchean Provincial Epoch)
Type section, locality, area and/or origin of name:
Type locality: roadcuts on U.S. Interstate 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 (Rose, 1972).
AAPG geologic province:
Permian basin
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 ([ ]).