Usage:
Grayson Formation of Washita Group (TX* and LA-subsurface)
Grayson Marl of Washita Group (OK,TX*)
Grayson Shale of Washita Group (AR*,TX*, and LA*-subsurface)
Grayson Shale (TX* and LA*-subsurface)
Subunits:
(alphabetical): Carpenter Limestone Member (TX*), Eagle Mountains Sandstone Member (TX*), West Prong Lentil (TX).
Geologic age:
late Early to early Late Cretaceous (Albian to Cenomanian; Comanchean Provincial Epoch)*
Type section, locality, area and/or origin of name:
Not synopsized to date.
AAPG geologic province:
Arkla basin*
East Texas basin*
Fort Worth syncline*
Ouachita folded belt*
South Oklahoma folded belt*
Strawn 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 ([ ]).