Detroit River Group (OHDdr;0)

State	Ohio
Name	Detroit River Group
Geologic age	Devonian
Original map label	Ddr
Primary rock type	dolostone (dolomite)
Secondary rock type	evaporite
Other rock types	sandstone
Lithologic constituents	Major Sedimentary > Carbonate > Dolostone (Bed)brown to gray; medium to thick bedded; laminated; nodules or interbeds of anhydrite and/or gypsum; basal part becomes sandy dolomite or fine-grained sandstone; as much as 170 feet thick. Minor Sedimentary > Clastic > Sandstone (Bed)basal part becomes sandy dolomite or fine-grained sandstone. Incidental Sedimentary > Chemical > Evaporite > Gypsum (Bed)nodules or interbeds of anhydrite and/or gypsum Sedimentary > Chemical > Evaporite > Anhydrite (Bed)nodules or interbeds of anhydrite and/or gypsum
Map references	Digital Ohio map from CD produced as a result of a contract between the U.S. Geological Survey and the Ohio Geological Survey. Released with permission of the Ohio Geological Survey, June 2005.
Unit references	Digital Ohio map from CD produced as a result of a contract between the U.S. Geological Survey and the Ohio Geological Survey. Released with permission of the Ohio Geological Survey, June 2005. File of unit descriptions received from Ohio Geological Survey.
Geographic coverage	Defiance - Henry - Lucas - Paulding - Putnam - Wood