Geologic Unit: Washita

Usage:

Washita Group (AL,AR*,NM,OK*,TX*, and LA*-subsurface)
Washita Group and Fredericksburg Group, undifferentiated (MS-subsurface)

Subunits:

(alphabetical): Bennington Limestone (OK), Bokchito Formation (OK*), Buda Limestone (AR*,LA,TX*), Caddo Formation (OK), Del Rio Clay (TX*) or Del Rio Formation (TX*), Denton Clay (OK*,TX*) or Denton Formation (OK,TX), Duck Creek Formation (LA*,NM,OK*,TX*) or Duck Creek Limestone (OK*,TX*), Espy Formation (TX), Etholen Formation (TX), Fort Lancaster Formation (TX), Fort Worth Formation (LA,TX) or Fort Worth Limestone (OK*,TX*), Georgetown Limestone (AR*,LA*,OK?,TX*) or Georgetown Formation (TX*), Grayson Shale (AR*,LA*,TX*) or Grayson Marl (OK,TX*) or Grayson Marlstone (OK) or Grayson Formation (TX*), Kiamichi Formation (LA), Main Street Limestone (OK*,TX*) or Main Street Formation (LA,TX), Maness Shale (TX), Pawpaw Formation (LA,OK*,TX*), Smeltertown Formation (NM,TX), South Tyler Formation (LA), Weno Clay (OK*) or Weno Limestone (TX*) or Weno Formation (LA).

Geologic age:

Early Cretaceous*

Type section, locality, area and/or origin of name:

Named from old Fort Washita, about sec. 23, T. 5 S., R. 7 E., Bryan Co., OK (Hill, 1887).

AAPG geologic province:

Permian basin*
Gulf Coast basin*
Arkla basin*
East Texas basin*
Strawn basin*
Fort Worth syncline*
South Oklahoma folded belt*
Ouachita folded belt*
Orogrande basin