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Usage:
Burnt Bluff Formation (MI*,WI*)
Burnt Bluff Group (MI,WI)
Subunits:
GROUP STATUS (alphabetical): Byron Dolomite (MI,WI) or Byron Formation (MI), Hendricks Dolomite (MI,WI) or Hendricks Formation (MI), Lime Island Dolomite (MI) or Lime Island Formation (MI).
FORMATION STATUS (alphabetical): Hendricks Member (MI,WI), Lime Island Member (MI).
Geologic age:
Silurian (Llandovery to Ludlow)*
Type section, locality, area and/or origin of name:
Named from exposures in high cliff called Burnt Bluff, on east shore of Big Bay de Noc, Delta Co., Upper Peninsula, MI (Ehlers, 1921).
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 ([ ]).