USGS Visual Identifier
National Geologic Map Database logo GEOLEX database

Geologic Unit: Prairie Bluff

Prairie Bluff Chalk of Selma Group (AL*,MS*)

Cretaceous, Late*
Maastrichtian, middle*
Maastrichtian, late*
Geologic Province:
Mid-Gulf Coast basin*

Areal Extent:

Type Locality:
Prairie Bluff, Wilcox Co., central AL (Winchell, 1857).

Unit Name History:
Named Prairie Bluff limestone (Winchell, 1857).
Revised (Stephenson, 1917).
Overview (Wilmarth, 1938).
Extended into MS and assigned to Selma Group (Belt and others, 1945).
Overview (Hughes, 1958; Sohl, 1960).
AL Geol. Survey usage (Raymond and others, 1988).
Biostratigraphic dating (Wingard, 1993).
Age modified; Correlation information (Prowell, 1994).

Note: If you need more information, please contact Nancy Stamm (
Asterisks (*) indicate usage by the U.S. Geological Survey. Other usages by state geological surveys.

"No current usage" implies that a name has been abandoned or that it has fallen into disuse. Former usage and, if known, replacement name given in parentheses ().

Slashes (/) indicate unit name usage violates the 1983 North American Stratigraphic Code. This violation may be explained within brackets ([ ]).

U.S. Department of the Interior, U.S. Geological Survey, Reston, VA, USA
Database project personnel
Last modified: 15-Jan-2013