Usage:
Bill's Creek Shale (MI)
Geologic age:
Late Ordovician (late Mohawkian to early Cincinnatian)
Type section, locality, area and/or origin of name:
Type locality: along Bill's Creek, 5 mi northeast of Rapid River, in sec. 7, T. 41 N., R. 20 W., and in sec. 12, T. 41 N., R. 21 W., [Rapid River 15-min quadrangle], Delta Co., northern MI (Hussey, 1926, 1952).
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 ([ ]).