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Sylvan Shale + Fernvale Limestone and Viola Limestone

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ARDMORE-SHERMAN- "Sylvan," shale, dark-greenish-gray; thickness, 60 to 325 feet. "Fernvale" and "Viola," limestone, gray, fine- to coarse-grained; thickness, 350 to 900 feet. Occurs in the ARBUCKLE MTNS.
State Oklahoma
Name Sylvan Shale + Fernvale Limestone and Viola Limestone
Geologic age Late Ordovician to Middle Ordovician
Lithologic constituents
Major
Sedimentary > Clastic > Mudstone > Shale (Bed)
Sedimentary > Carbonate > Limestone (Bed)
References

Heran, W.D., Green, G. and Stoeser, D.B., 2003, A Digital Geologic Map Database of Oklahoma: USGS Open File Report 03-247, scale 1:250,000.

https://pubs.er.usgs.gov/publication/ofr03247

Hart, D.L., 1974, Reconnaissance of the water resources of the Ardmore and Sherman quadrangles, southern Oklahoma: Oklahoma Geological Survey, Hydrologic Atlas 3, scale 1:250,000, 4 sheets. (Geology on sheet 1 compiled by D.L. Hart, and R.O. Fay, in 1970.)

Cederstrand, J.R., 1996a, Digital geologic map of Ardmore-Sherman quadrangles, south-central Oklahoma: U.S. Geological Survey Open-File Report 96-370, (3 diskettes), URL address is: http://ok.water.usgs.gov/gis/geology

https://pubs.er.usgs.gov/publication/ofr96370
NGMDB product
Counties Atoka - Carter - Coal - Johnston - Love - Marshall - Murray - Pontotoc