|Name||Cedarville, Springfield, Euphemia, and Laurel Dolomites; Massie Shale, Undivided|
Sedimentary > Carbonate > Dolostone (Bed)Cedarville: white to gray to blue gray weathers gray; abundant intercrystalline, moldic, and vuggy porosity, massive bedded, 0 to 100 feet thick; pentamerid brachiopod fossil zone near contact with Springfield. Springfield: gray to tan, mottled with brownish gray, massive bedded where unweathered and layered brick-like where weathered, 5 to 10 feet thick. Euphemia: dolomite to dolomitic limestone, gray to bluish gray, massive bedded, 5 to 15 feet thick. Massie: gray to bluish gray, minor limestone and dolomite beds, calcareous, slakes easily, planar to irregular bedding, thin to thick bedded, 0 to 10 feet thick. Laurel: gray to tan, weathers brown, argillaceous to nonargillaceous, wavy bedding, thin to medium bedded, 5 to 10 feet thick.
Sedimentary > Clastic > Mudstone > Shale (Calcareous)Massie Shale: gray to bluish gray, calcareous, slakes easily, planar to irregular bedding, thin to thick bedded, 0 to 10 feet thick.
Sedimentary > Carbonate > Limestone (Bed)Euphemia Dolomite: dolomite to dolomitic limestone, gray to bluish gray, massive bedded, 5 to 15 feet thick. Massie Shale: gray to bluish gray, minor limestone and dolomite beds, calcareous.
|Comments||Secondary unit description from USGS Lexicon website (ref. OH017) and OH008.|
Slucher, E.R., (principal compiler), Swinford, E.M., Larsen, G.E., and others, with GIS production and cartography by Powers, D.M., 2006, Bedrock geologic map of Ohio: Ohio Division of Geological Survey Map BG-1, version 6.0, scale 1:500,000.
Ausich, W.I., 1987, John Bryan State Park, Ohio; Silurian stratigraphy, IN Biggs, D.L., ed., North-central Section of the Geological Society of America, Centennial field guide: Geological Society of America, North-Central Section, The Decade of North American Geology (DNAG), Centennial Field Guide, v. 3, p. 419-422.
USGS Geologic Names lexicon found at: http://ngmdb.usgs.gov/Geolex/
|Counties||Clinton - Fayette - Greene - Highland|