Usage:
Traverse Group (MI*)
Traverse Formation (MI)
Traverse Formation of Muscatatuck Group (IN)
Subunits:
GROUP STATUS (alphabetical) --all in MI: Alpena Limestone*, Beebe School Formation*, Bell Shale*, Charlevoix Limestone, Ferron Point Formation*, Four Mile Dam Formation*, Genshaw Formation*, Gravel Point Formation, Jordan River Formation, Koehler Limestone, Newton Creek Limestone*, Norway Point Formation*, Petosky Formation or Petosky Limestone, Potter Farm Formation, Rockport Quarry Limestone*, Silica Formation, Tenmile Creek Dolomite, Thunder Bay Limestone*.
Geologic age:
Middle Devonian*
Type section, locality, area and/or origin of name:
Exposures on Little Traverse Bay, Michigan (Winchell, 1871).
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 ([ ]).