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Peebles Dolomite, Lilley and Bisher Formations, Undivided

Peebles Dolomite, Lilley Formation, Bisher Formation, Undivided - Peebles Dolomite, bluish gray weathers light gray; planar to irregular, thick to massive bedded; 0 to 120 feet thick; vuggy to cavernous porosity; cliffs former. Lilley Formation, dolomite with minor limestone, chert, and shale; bluish gray to gray weathers reddish gray to gray; planar to irregular, thin to thick bedded; 20 to 80 feet thick; fossiliferous. Bisher Formation, dolomite with minor shale; bluish gray to gray weathers yellowish-orange; argillaceous and silty in part; planar to lenticular, thin to thick bedded; 20 to 90 feet thick; Interval ranges from 80 to 160 feet in thickness. Peebles Dolomite overlies Lilley Formation and underlies Greenfield Dolomite, Hillsboro Sandstone, or Ohio Shale in southern OH. Age is Silurian (Wenlockian and Ludlovian) (Rexroad and Kleffner, 1984). Wenlockian age of the Lilley Formation is based on 10 species of conodont fauna. The Lilley Formation, Lilley-Peebles transition unit, and the Peebles Dolomite compose the upper Niagaran sequence along the east flank of the Cincinnati arch in southern OH. The Lilley consists of two main lithologies: 1) gray to blue gray, fine-grained argillaceous, variably fossiliferous uneven- to thin-bedded dolomite with dolomitic shale partings and 2) light-gray, medium to coarse-grained fossiliferous dolomite. Thickness averages 15 m in Adams and southeastern Highland Cos. and thickens to 24 m in western and northwestern Highland Co. Eustatic sea-level fall in early to middle Wenlockian is proposed as the cause for shoaling during deposition. Underlies Peebles Dolomite and overlies Bisher Formation (Kleffner, M.A., 1990).
StateOhio
NamePeebles Dolomite, Lilley and Bisher Formations, Undivided
Geologic ageSilurian
Original map labelSpb
CommentsSecondary unit descriptions from USGS Lexicon website (OH017) and OH006, OH007.
Primary rock typedolostone (dolomite)
Secondary rock typeshale
Other rock typeslimestone; chert
Lithologic constituents
Major
Sedimentary > Carbonate > Dolostone (Bed)Peebles: bluish gray weathers light gray; planar to irregular, thick to massive bedded; 0 to 120 feet thick; vuggy to cavernous porosity; cliffs former. Lilley: dolomite; bluish gray to gray weathers reddish gray to gray; planar to irregular, thin to thick bedded; 20 to 80 feet thick; fossiliferous. Bisher Formation: dolomite; bluish gray to gray weathers yellowish-orange; argillaceous and silty in part; planar to lenticular, thin to thick bedded; 20 to 90 feet thick.
Minor
Sedimentary > Clastic > Mudstone > ShaleLilley Formation: minor shale; Bisher Formation: minor shale
Incidental
Sedimentary > Carbonate > LimestoneLilley Formation: minor limestone.
Sedimentary > Chemical > ChertLilley Formation: minor chert.
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.
Rexroad, C.B. and Kleffner, M.A., 1984, The Silurian stratigraphy of east-central Kentucky and adjacent Ohio; Field trip no.5: Geological Society of America, Southeastern Section, Guidebook for Field Trips, Joint meeting of Geological Society of America, Southeastern Section and North-Central Section, Lexington, KY, April, 1984, p. 44-65.
Kleffner, M.A., 1990, Wenlockian (Silurian) conodont biostratigraphy, depositional environments, and depositional history along the eastern flank of the Cincinnati arch in southern Ohio: Journal of Paleontology, v. 64, no. 2, p. 319-328.
USGS Geologic Names Lexicon (GEOLEX)
Geographic coverageAdams - Clinton - Fayette - Highland - Pike - Ross - Scioto

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