Usage:
Gizzard Creek Member of Coralville Formation of Cedar Valley Group (IA,MN,MO)
Geologic age:
late Middle Devonian (Givetian)
Type section, locality, area and/or origin of name:
Gizzard Creek quarry, in NW/4 SW/4 sec. 23, T. 95 N., R. 15 W., Floyd Co., IA (Witzke and others, 1988).
Reference sections: (surface) Tracey quarry, in N/2 SW/4 NE/4 sec. 29, T. 94 N., R. 14 W., Chickasaw Co.; and (subsurface) FM-4 core, in SW/4 NW/4 SE/4 sec. 31, T. 96 N., R. 18 W., Floyd Co., IA (Witzke and others, 1988).
AAPG geologic province:
Iowa shelf
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 ([ ]).