|Latitude & Longitude (WGS84):||42° 54' North , 85° 42' West|
|Latitude & Longitude (decimal):||42.90000,-85.70000|
|Köppen climate type:||Dfb : Warm-summer humid continental climate|
A gypsum mine owned by the Grand Rapids Gypsum Co. and located at Wyoming, near Grand Rapids.
3 valid minerals.
This geological map and associated information on rock units at or nearby to the coordinates given for this locality is based on relatively small scale geological maps provided by various national Geological Surveys. This does not necessarily represent the complete geology at this locality but it gives a background for the region in which it is found.
Click on geological units on the map for more information. Click here to view full-screen map on Macrostrat.org
252.17 - 541 Ma
|Paleozoic sedimentary rocks|
Age: Paleozoic (252.17 - 541 Ma)
Lithology: Sedimentary rocks
Reference: Chorlton, L.B. Generalized geology of the world: bedrock domains and major faults in GIS format: a small-scale world geology map with an extended geological attribute database. doi: 10.4095/223767. Geological Survey of Canada, Open File 5529. 
323.2 - 358.9 Ma
Age: Mississippian (323.2 - 358.9 Ma)
Stratigraphic Name: Michigan Formation
Comments: Secondary unit description from USGS Geologic Names lexicon (ref. MI016): Unit, which is mostly shale, is Osagean and Meramecian in age and conformably overlies the Marshall Sandstone. Underlies the Meramecian Bayport Limestone. Michigan Formation reaches its maximum thickness of 152 m in Missaukee Co. to the north of the central basin area. Thicknesses of 91 to 122 m are more typical. Although generally composed of greenish gray and dark gray shale, this formation is lithologically variable and includes discontinuous beds of sandstone, limestone, dolostone, gypsum, and anhydrite. One of these carbonate beds, called the "Brown Lime," is a 3- to 6-m thick dolostone that can be traced in the subsurface across much of the basin.
Reference: Horton, J.D., C.A. San Juan, and D.B. Stoeser. The State Geologic Map Compilation (SGMC) geodatabase of the conterminous United States. doi: 10.3133/ds1052. U.S. Geological Survey Data Series 1052.