Usage:
Cotton Valley Formation (AL*,AR*,FL*,GA*,LA*,MS*,TX*)
Cotton Valley Group (AL,AR,FL,LA*,TX)
Subunits:
Bodcaw Sand (LA), Bossier Formation (AL,AR*,LA*, MS,TX*), Davis Sand (LA), Dorcheat Formation (LA), Hico Shale (LA), Knowles Limestone (AR,LA,TX), Schuler Formation (AL,AR*,LA*,MS,TX*), Shongaloo Formation (LA), Terryville Sandstone (LA,TX), and Vaughn Sand (LA)
Geologic age:
Late Jurassic to Early Cretaceous (Tithonian to Hauterivian)*
Type section, locality, area and/or origin of name:
Not designated. Named from the Cotton Valley field, Webster Parish, LA (Weeks, 1938).
Type locality: Cotton Valley field, Webster Parish, LA (Shearer, 1938).
AAPG geologic province:
Gulf Coast basin*
Mid-Gulf Coast basin*
Arkla basin*
East Texas basin*
South Georgia sedimentary province*
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 ([ ]).