Usage:
Norwood Member of Antrim Shale (MI*)
Geologic age:
early Late Devonian (Frasnian)*
Type section, locality, area and/or origin of name:
Type section: Paxton quarry, in N/2 sec. 30, T. 31 N., R. 7 E., along the south side of MI Highway 32, 14 km west of Alpena, Lachine and Lake Winyah 7.5-min quadrangles, Alpena Co., northeast MI (Gutschick and Sandberg, 1991).
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 ([ ]).