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National Geologic Map Database

Geologic Unit: Brownstown

Usage:

Brownstown Marl (AR*,LA*,OK*)
Brownstown Marl of Austin Group (TX*)
Brownstown Formation (OK*)
Brownstown Formation of Austin Group (LA*,TX*)


Geologic age:

Late Cretaceous (early Campanian; Gulfian Provincial Epoch, Austinian Provincial Age)*


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

First described in vicinity of Brownstown, Sevier Co., AR (Hill, 1888; 1894; 1901).
"The village of Brownstown, Sevier County, Arkansas, is located on top of Brownstown marl as thus restricted by Stephenson and Dane" (see GNC remarks, Wilmarth, 1938, p. 276).


AAPG geologic province:

Ouachita folded belt*
Arkla basin*


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 ([ ]).