|Geologic age||Early Devonian|
Sedimentary > Clastic > Sandstone (Bed)
Sedimentary > Carbonate > Dolostone (Bed)
|Comments||Secondary unit description from USGS Geologic Names lexion (ref. MI016): Unit is extremely pure glass sand, 20 or more feet thick|
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/
|Counties||Monroe - Wayne|