Demopolis Chalk of Selma Group (AL*,MS*)
Demopolis Formation (MS*,TN*)
Bluffport Marl Member (AL*,MS,TN)
Late Cretaceous (Campanian to Maastrichtian)*
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).
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 ([ ]).