Usage:
Bass Islands Dolomite (MI*,OH*,PA*)
Bass Islands Formation (WV)
Bass Islands Formation of Hunton Group (KY)
Bass Islands Group (OH*,PA,MI)
Subunits:
GROUP STATUS (alphabetical): Bertie Dolomite (PA), Cobleskill Limestone (PA), Greenfield Dolomite (OH*) or Greenfield Formation (OH), Put-in-Bay Dolomite (MI,OH*), Raisin River Dolomite (MI,OH*), St. Ignace Formation (MI), Tymochtee Formation (OH).
FORMATION STATUS (alphabetical): Greenfield Member (OH), Put-in-Bay Member (MI*), Raisin River Member (MI*,OH).
Geologic age:
late Silurian*
Type section, locality, area and/or origin of name:
Named from group of islands in western Lake Erie (Lane and others, 1909).
AAPG geologic province:
Michigan basin*
Appalachian 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 ([ ]).