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Cedarville, Springfield, and Euphemia Dolomites, Undivided

Cedarville, Springfield, and Euphemia Dolomite, Undivided - Cedarville Dolomite, white to gray to blue gray, weathers gray, abundant intercrystalline, moldic, and vuggy porosity, massive bedded, 0 to 100 feet thick. Diagnostic features include porosity, cliff-forming nature of unit, and pentameriid brachiopod fossil zone near contact with Springfield Dolomite. Springfield Dolomite, gray to tan, mottled with brownish gray, massive bedded where unweathered and layered bricklike where weathered, 5 to 10 feet thick. Euphemia Dolomite, dolomite to dolomitic limestone, gray to bluish gray, massive bedded, 5 to 15 feet thick. Diagnostic features include large, blocky bedding where weathered and cliff forming nature. Interval ranges from 10 to 125 feet in thickness. Euphemia Dolomite averages 1.6 to 2.6 m in thickness. Environment of deposition was normal marine offshore, free from clastic influence; similar to Cedarville Dolomite. Unconformably overlies Massie Shale. Correlates with Bisher Formation to the southeast. Age is Wenlockian (Ausich, 1987).
StateOhio
NameCedarville, Springfield, and Euphemia Dolomites, Undivided
Geologic ageSilurian
Original map labelSce
CommentsSecondary unit description from USGS Lexicon website (ref. OH017) and OH008.
Primary rock typedolostone (dolomite)
Secondary rock typelimestone
Other rock types
Lithologic constituents
Major
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.
Incidental
Sedimentary > Carbonate > Limestone (Bed)Euphemia Dolomite: dolomite to dolomitic limestone, gray to bluish gray, massive bedded, 5 to 15 feet thick.
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.
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 (GEOLEX)
Geographic coverageChampaign - Clark - Greene - Madison - Montgomery

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