|Geologic age||Early Silurian|
Sedimentary > Carbonate > Dolostone (Bed)
|Comments||Secondary unit description from USGS Geologic Names lexicon (ref. MI016): Named the Engadine dolomite for Engadine, Mackinac Co., northern MI. Consists of very massive, hard, very crystalline dolomite, distinctly bluish or mottled and streaked with blue. Also characterized by numerous drusy cavities more or less completely filled with crystal of dolomite or pearl spar. Thickness is 54 to 95 feet. Overlies Manistique series. The Engadine is of Silurian age. Raised the Engadine to the Engadine Group. Group includes (ascending) the Rockview Dolostone, Rapson Dolostone, and Bush Bay Dolostone. Overlies the Manistique Group and underlies the Salina Group.|
Reed, Robert C., and Daniels, Jennifer (compilers), 1987, Bedrock geology of northern Michigan: Geological Survey Division, Michigan Dept. of Natural Resources, scale 1:500,000.
USGS Geologic Names lexicon found at: http://ngmdb.usgs.gov/Geolex/
|Counties||Chippewa - Delta - Mackinac - Schoolcraft|