USGS Visual Identifier
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Geologic Unit: Selma

Selma Group (AL*,MS*,TN*)

Cretaceous, Late*

Geologic Province:
Mid-Gulf Coast basin*
Black Warrior basin*
Upper Mississippi embayment*
Areal Extent:

Type Locality:
Not designated. Named from Selma, Dallas Co., AL.

Mooreville Chalk/Formation (AL*,MS*), Coffee Sand (TN*,MS*), Demopolis Chalk/Formation (AL*,MS*), Ripley Formation (AL*,MS*,TN*), Prairie Bluff Chalk (AL*,MS*), Owl Creek Formation (MS*,TN*), Eutaw Formation (AL), Providence Sand (AL*), and Blufftown Formation (AL*)

Unit Name History:
Named Selma chalk (Smith and others, 1894).
Overview (Wilmarth, 1938).
Overview (Stephenson and Monroe, 1938).
Subdivided (Monroe, 1941).
Revised to group (Belt and others, 1945).
Overview in MS (Merrill and others, 1988).
Overview in AL (Raymond and others, 1988).
Overview (Russell and Keady, 1990).

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