U.S. Geological Survey Home AASG Logo USGS HOME CONTACT USGS SEARCH USGS
National Geologic Map Database

Geologic Unit: Demopolis

Usage:

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


Subunits:

Bluffport Marl Member (AL*,MS,TN)


Geologic age:

Late Cretaceous (Campanian to Maastrichtian)*


Type section, locality, area and/or origin of name:

Type locality: bluff of chalk on Tombigbee River at Webb and Sons cotton warehouse in Demopolis, [near Webbs Landing, in NW/4 SW/4 sec. 24, T. 18 N., R. 2 E., Demopolis 7.5-min quadrangle], Marengo Co., western AL (Smith, 1903; Monroe, 1941).


AAPG geologic province:

Black Warrior basin*
Mid-Gulf Coast basin*
Upper Mississippi embayment*


For more information, please contact Nancy Stamm, Geologic Names Committee Secretary.

Asterisk (*) indicates usage by the U.S. Geological Survey. Other usages by state geological surveys.

"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 does not conform with nomenclatural guidelines (CSN, 1933; ACSN, 1961, 1970; NACSN, 1983, 2005). This may be explained within brackets ([ ]).