Bass Island Dolomite

Bass Island Dolomite
State Michigan
Name Bass Island Dolomite
Geologic age Late Silurian
Lithologic constituents
Sedimentary > Carbonate > Dolostone (Bed)
Sedimentary > Clastic > Sandstone (Bed)
Sedimentary > Clastic > Mudstone > Shale (Bed)
Sedimentary > Carbonate > Limestone (Bed)
Comments Secondary unit description from USGS Geologic Names lexicon (ref. MI016): Named Bass Islands series. Unit disconformably underlies the Sylvania sandstone and overlies the Salina. The Bass Islands includes (descending) the Raisin River dolomite (200 feet), the Put-in-Bay dolomites (100 feet), Greenfield dolomite (100 feet), and the Tymochtee shales and limestones (100 feet), which may represent in part one or more members recognized elsewhere. Age is Silurian. Named from group of islands in western Lake Erie.

Milstein, Randall L. (compiler), 1987, Bedrock geology of southern Michigan: Geological Survey Division, Michigan Dept. of Natural Resources, scale 1:500,000.

USGS Geologic Names lexicon found at:

NGMDB product
Counties Monroe