USGS Visual Identifier
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Geologic Unit: Demopolis

Usage:
Demopolis Chalk of Selma Group (AL*,MS*)
Demopolis Formation (MS*,TN*)

Age:
Cretaceous, Late*
Gulfian*
Campanian
Maastrichtian
Geologic Province:
Black Warrior basin*
Mid-Gulf Coast basin*
Upper Mississippi embayment*

Areal Extent:
AL*
MS*
TN*


Type Locality:
Exposures at Demopolis, Marengo Co., AL (Smith, 1903; Monroe, 1941).

Subunits:
Bluffport Marl Member (AL*,MS,TN)

Unit Name History:
Named (Smith, 1903).
Abandoned (Stephenson, 1926).
Reinstated (Monroe, 1941).
Extended into MS (Bergquist, 1943).
Revised in MS (Belt and others, 1945).
Revised (Monroe, 1956).
Extended into TN (Cushing, 1962; Russell, 1965).
Overview in AL (Raymond and others, 1988).
Biostratigraphic dating (Puckett, 1994).

Note: If you need more information, please contact Nancy Stamm (nstamm@usgs.gov).
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
URL http://ngmdb.usgs.gov/ngmdb/ngm_catalog.ora.html
Database project personnel
Last modified: 15-Jan-2013