Usage:
Antrim Shale (IL,IN*,MI*,OH,WI)
Subunits:
(alphabetical) --all in MI: /Chester black shale member (informal), Lachine Member*, Norwood Member*, Paxton Member*.
Geologic age:
Late Devonian*
Type section, locality, area and/or origin of name:
Named from Antrim Co., Lower Peninsula, MI, in which the shales are exposed (Lane, 1901).
Type locality: 1.6 km south of Norwood, along Lake Michigan (GNU records, USGS DDS-6; Reston GNULEX).
AAPG geologic province:
Michigan basin*
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 ([ ]).