Usage:
Augusta Group (IA)
Subunits:
(descending) --all in IA: Warsaw Formation, Keokuk Formation, Burlington Formation.
Geologic age:
Early to Middle Mississippian (Tournaisian to Visean; Osagean to Meramecian)
Type section, locality, area and/or origin of name:
Named from Augusta, Des Moines Co., IA (Keyes, 1893).
AAPG geologic province:
Iowa shelf
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 ([ ]).