Usage:
Coralville Formation of Cedar Valley Group (IL,IA,MN,MO)
Coralville Limestone Member of Cedar Valley Formation (IA)
Coralville Member of Cedar Valley Limestone (IL)
Subunits:
FORMATION STATUS (alphabetical): Cou Falls Member (IL,IA,MO), Gizzard Creek Member (IA,MN,MO), Iowa City Member (IA,MN,MO).
Geologic age:
late Middle Devonian (Givetian)
Type section, locality, area and/or origin of name:
Not synopsized to date.
AAPG geologic province:
Iowa shelf
Lincoln anticline
Wisconsin arch
Illinois 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 ([ ]).