Usage:
Winn Formation of Saginaw Group (MI)
Subunits:
Verne Member
Geologic age:
Pennsylvanian, Early
Pennsylvanian, Middle
Type section, locality, area and/or origin of name:
Type section (subsurface): depth-interval 573 to 706 ft, McClure Oil Company No. 1-20 Paul and Karen Bigelow well, in SE/4 SE/4 NW/4 sec. 30, T. 13 N., R. 4 W., Lincoln Twp., Isabella Co., MI. Origin of name not stated by author (Vugrinovich, 1984).
AAPG geologic province:
Michigan 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 ([ ]).