- Usage in publication:
-
- Castor Creek member
- Modifications:
-
- Original reference
- Dominant lithology:
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- Silt
- Clay
- AAPG geologic province:
-
- Gulf Coast basin
Summary:
Pg. 118 (fig. 26), 164-168, 174, geol. map. Castor Creek member of Fleming formation of Grand Gulf group. Brackish-water calcareous clays and noncalcareous silts. Thickness at least 200 feet. Underlies Blounts Creek member (new); overlies Williamson Creek member (new) (all of Fleming formation). Fossils (pelecypods, ostracods, gastropods, forams). Age is Miocene.
Type section (subsurface): a composite of two water wells, in sec. 30, T. 3 N., R. 2 W., Rapides Parish, central LA; thickness abut 170 feet.
Notable exposures in southern valley wall of Castor Creek, in T. 3 and 4 N., R. 2 W., Rapides Parish, central LA.
Source: US geologic names lexicon (USGS Bull. 1200, p. 668); supplemental information from 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 ([ ]).