- Usage in publication:
-
- Lake Crockett shale member
- Modifications:
-
- Named
- Dominant lithology:
-
- Shale
- AAPG geologic province:
-
- East Texas basin
- Ouachita folded belt
- South Oklahoma folded belt
Summary:
Named as upper member of Lake Crockett formation of the Eagle Ford group for exposures in the ravine below the spillway of Lake Crockett, Fannin Co., TX in the Ouachita tectonic belt province. Measured section described below spillway. Occurs in outcrop near Sherman, Grayson Co., TX in the South Oklahoma folded belt province and in the subsurface in the East Texas basin. Consists of soft, gray, thin-bedded to laminated, alternating sands, silts, clays, and gypsiferous shales; argillaceous beds predominant; 20-30 ft thick. Overlies Lake Crockett sand member. Underlies Ector formation. [Late Cretaceous.]
Source: GNU records (USGS DDS-6; Denver GNULEX).
- Usage in publication:
-
- Lake Crockett shale memberâ€
- Modifications:
-
- Abandoned
Summary:
Abandoned because of homonymous nomenclature unsuitable for the rock-stratigraphic character of the units as they occur in the Ouachita tectonic belt and the South Oklahoma folded belt provinces. Is replaced by the Maribel Shale Member of the Eagle Ford Formation. Assigned a late Turonian age.
Source: GNU records (USGS DDS-6; Denver GNULEX).
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 ([ ]).