Usage:
Norwalk Member of Jordan Sandstone (WI*,MN*)
Norwalk Member of Jordan Formation (WI,IA)
Geologic age:
Late Cambrian*
Type section, locality, area and/or origin of name:
Well exposed at village of Norwalk, Monroe Co., west-central WI (Ulrich, 1924).
AAPG geologic province:
Wisconsin arch*
Iowa shelf
Sioux uplift*
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 ([ ]).