Usage:
St. Lawrence Dolomite of Trempealeau Group (IA)
St. Lawrence Formation (IA*,MN*,WI*)
St. Lawrence Member of Trempealeau Formation (IA*,MI*)
Subunits:
(ascending) Black Earth (WI*,MN*,IA) and Lodi Members (WI*,MN*,IA*)
Geologic age:
Late Cambrian*
Type section, locality, area and/or origin of name:
Named from exposures at St. Lawrence, Scott Co., southern MN (Winchell, 1874).
AAPG geologic province:
Sioux uplift*
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 ([ ]).