Usage:
Eagle Ford Group (TX*)
Eagle Ford Shale (OK*,TX*)
Eagle Ford Clay (LA*,OK*,TX*)
Eagle Ford Formation (OK,TX*)
Eagle Ford Formation of Tuscaloosa Group (LA)
Subunits:
GROUP STATUS (alphabetical) --all in TX: Arcadia Park Formation* or Arcadia Park Shale, Britton Clay or Britton Formation*, Chispa Summit Formation, Lake Waco Formation, South Bosque Formation or South Bosque Marl or South Bosque Shale, Tarrant Clay or Tarrant Formation*.
FORMATION STATUS (alphabetical): Arcadia Park Member (OK,TX), Bells Sandstone Member (TX*), Britton Member (TX), Kamp Ranch Limestone Member (TX), Maribel Shale Member (TX), /Pine Bluff Volcanic Zone (TX).
Geologic age:
Late Cretaceous (Cenomanian to Turonian)*
Type section, locality, area and/or origin of name:
Named from exposures at Eagle Ford, Dallas Co., northeastern TX (Hill, 1887).
AAPG geologic province:
Gulf Coast basin*
Arkla basin*
East Texas basin*
Strawn basin*
Ouachita folded belt*
Permian basin*
Fort Worth syncline*
South Oklahoma folded belt*
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 ([ ]).