Usage:
Little Cedar Formation of Cedar Valley Group (IL,IA,MN,MO)
Subunits:
(alphabetical): Bassett Member (IA,MN), Chickasaw Shale Member (IA), Eagle Center Member (IA), Hinkle Member (IA), Rapid Member (IA), Solon Member (IL,IA,MO).
Geologic age:
late Middle Devonian (Givetian)
Type section, locality, area and/or origin of name:
At Chickasaw Park quarry adjacent to Little Cedar River, southwest Chickasaw Co., IA (Witzke and others, 1988).
AAPG geologic province:
Iowa shelf
Illinois basin
Wisconsin arch
Lincoln anticline
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 ([ ]).