Usage:
Grape Creek Formation of Albany Group (TX-notably south of Wichita River)
[†?] Grape Creek Limestone Member of Clyde Formation of Wichita Group (TX*)
Subunits:
FORMATION STATUS (alphabetical) --all in TX: Millersview Limestone Member, Winkler Ford Limestone Member.
Geologic age:
early Permian (Leonardian)*
Type section, locality, area and/or origin of name:
Named from Grape Creek, Coleman Co., Colorado River region, central TX (US geologic names lexicons, USGS Bull. 896, 1200).
AAPG geologic province:
Bend arch*
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 ([ ]).