Usage:
Montgomery Formation (TX*)
Montgomery alloformation (informal) (LA*)
For informal usage, the rank or lithologic term should not be capitalized.
Geologic age:
Quaternary (Pleistocene)*
Type section, locality, area and/or origin of name:
Named from exposures near Montgomery, Grant Parish, central LA. Well exposed at Waddel Bluff, in sec. 8, T. 7 N., R. 4 W. (Fisk, 1938).
AAPG geologic province:
Arkla basin*
Gulf Coast basin*
For more information, please contact Nancy Stamm, Geologic Names Committee Secretary.
Asterisk (*) indicates published by U.S. Geological Survey authors.
"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 conflicts with nomenclatural guidelines (CSN, 1933; ACSN, 1961, 1970; NACSN, 1983, 2005, 2021). May be explained within brackets ([ ]).