Usage:
Scotch Grove Formation (IL,IA)
Subunits:
Johns Creek Quarry Member (IA,IL), Welton Member (IA,IL), Buck Creek Quarry Member (IA), Fawn Creek Member (IA), Waubeek Member (IA,IL), and Palisades-Kepler Member (IA)
Geologic age:
early Silurian
Type section, locality, area and/or origin of name:
Quarry area north of the town of Scotch Grove, in NW/4 SE/4 SE/4 and SE/4 NW/4 SE/4 sec. 7, T. 85 N., R. 2 W., Jones Co., IA (Bunker and others, 1985).
Reference section (subsurface): core from near Walford, in SE/4 SW/4 SW/4 SW/4 sec. 5, T. 81 N., R. 8 W., Johnson Co., IA (Bunker and others, 1985).
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 ([ ]).