Usage:
Fort Terrett Formation (TX)
Fort Terrett Formation of Edwards Group (TX-recognized on eastern Edwards Plateau)
Subunits:
FORMATION STATUS: Kirschberg Evaporite Member (TX).
Geologic age:
late Early Cretaceous (Albian; Comanchean Provincial Epoch)
Type section, locality, area and/or origin of name:
Type locality: roadcuts of U.S. Highway 290 where highway rises out of valley of North Llano River, onto Edwards Plateau, 0.8 km south of Roosevelt, Kimble Co., TX. Named from Fort Terrett, 19th century army post, 13 km west (Rose, 1972).
AAPG geologic province:
Kerr basin
Llano uplift
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 ([ ]).