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National Geologic Map Database

Geologic Unit: Iowa City

Usage:

Iowa City Member of Coralville Formation of Cedar Valley Group (IA)


Geologic age:

late Middle Devonian (Givetian)


Type section, locality, area and/or origin of name:

In Hutchinson quarry, in SE/4 SE/4 NE/4 sec. 9, T. 79 N., R. 6 W., Johnson Co., IA (Witzke and others, 1988).


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 ([ ]).