Skip to main content

Bayport Limestone

Bayport Limestone
State Michigan
Name Bayport Limestone
Geologic age Mississippian
Comments Secondary unit description from USGS Geologic Names lexicon (ref. MI016): The Bayport limestone consists of sandy yellow limestones, cross-bedded white sandstone, and a little dolomite. Unit is 20 to 50+ feet thick. The Bayport is the top unit in the Grand Rapids group or series. Maximum thickness of the Bayport is about 37 m but in most places is 15 to 30 m thick. Unit is lithologically variable, but is predominantly carbonate. It also contains significant amounts of sandstone and minor quantities of shale, bedded chert, and evaporites.
Primary rock type limestone
Secondary rock type dolostone (dolomite)
Other rock types sandstone; shale; chert; evaporite
Lithologic constituents
Major
Sedimentary > Carbonate > Limestone (Bed)
Minor
Sedimentary > Clastic > Sandstone (Bed)
Sedimentary > Carbonate > Dolostone (Bed)
Incidental
Sedimentary > Clastic > Mudstone > Shale (Bed)
Sedimentary > Chemical > Evaporite (Bed)
Sedimentary > Chemical > Chert (Bed)banded chert
Map references
Milstein, Randall L. (compiler), 1987, Bedrock geology of southern Michigan: Geological Survey Division, Michigan Dept. of Natural Resources, scale= 1:500,000
Unit references
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 (GEOLEX)
Counties Barry - Eaton - Huron - Ingham - Ionia - Jackson - Kent - Lake - Missaukee - Muskegon - Newaygo - Ogemaw - Ottawa - Roscommon - Tuscola - Wexford