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National Geologic Map Database

Geologic Unit: Norwood

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 ([ ]).