| State | Michigan |
|---|---|
| Name | Bayport Limestone |
| Geologic age | Mississippian |
| Lithologic constituents |
Major
Sedimentary > Carbonate > Limestone (Bed)
Minor
Sedimentary > Carbonate > Dolostone (Bed)
Sedimentary > Clastic > Sandstone (Bed)
Incidental
Sedimentary > Clastic > Mudstone > Shale (Bed)
Sedimentary > Chemical > Chert (Bed)banded chert
Sedimentary > Chemical > Evaporite (Bed)
|
| 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. |
| 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 found at: http://ngmdb.usgs.gov/Geolex/https://ngmdb.usgs.gov/Geolex/search |
| NGMDB product | |
| Counties | Barry - Calhoun - Eaton - Genesee - Huron - Ingham - Ionia - Jackson - Kent - Lake - Livingston - Missaukee - Muskegon - Newaygo - Ogemaw - Ottawa - Roscommon - Shiawassee - Tuscola - Wexford |