- Usage in publication:
-
- Chiwapa sandstone member
- Modifications:
-
- Named
- Dominant lithology:
-
- Limestone
- Sandstone
- AAPG geologic province:
-
- Black Warrior basin
- Upper Mississippi embayment
Summary:
Named as top member of Ripley formation. Named for Chiwapa Creek, Pontotoc Co., northeastern MS. Outcrops throughout Clay, Chickasaw, Union, and Tippah Cos., northern MS. Characteristically is "bored" or "horseshoe" limestone or calcareous sandstone; irregularly indurated. Thickness is approximately 80 ft. Overlies Ripley marlstone; coarseness of Chiwapa sands suggests possibility of unconformity; separated from overlying Prairie Bluff-Owl Creek by sharp contact that may represent unconformity or diastem. [Age is Late Cretaceous.]
Source: GNU records (USGS DDS-6; Reston 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 ([ ]).