Usage:
Cape La Croix Shale of Maquoketa Group (IL*,MO*)
Geologic age:
Ordovician, Late*
Cincinnatian*
Type section, locality, area and/or origin of name:
Type section: stream bank exposure, east fork of Cape La Croix Creek, in SW/4 SW/4 SW/4 sec. 13, T. 31 N., R. 13 E., Cape Girardeau 7.5-min quadrangle, Cape Girardeau Co., southeastern MO. Origin of name not stated by authors, but probably named from the creek (Thompson, 1991; Thompson and Tull, 1991).
Reference section: at type section of Cape Limestone, in city of Cape Girardeau, near intersection of Broadway and North Main St. (Thompson, 1991; Thompson and Tull, 1991).
AAPG geologic province:
Ozark uplift*
Upper Mississippi embayment*
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 ([ ]).