Usage:
Wapsipinicon Group (IL,IA,MN)
Wapsipinicon Formation (MN, and MO-subsurface)
Wapsipinicon Limestone (IL,IA)
Subunits:
GROUP STATUS (alphabetical): Bertram Formation (IA), Otis Formation (IL,IA), Pinicon Ridge Formation (IL,IA,MN,MO), Spillville Formation (IA,MN).
FORMATION STATUS (alphabetical): Coggon Member (IL,IA), Davenport Member (IL,IA), Kenwood Member (IL,IA), Otis Member (IL,IA), Spring Grove Member (IL,IA).
Geologic age:
Middle Devonian (Eifelian to early Givetian)
Type section, locality, area and/or origin of name:
Type section: Pinicon Ridge Park, in NE/4 SW/4 SE/4 sec. 28, T. 86 N., R. 6 W., Linn Co., IA (Witzke, 1988).
AAPG geologic province:
Iowa shelf
Wisconsin arch
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 ([ ]).