State | Oklahoma |
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Name | Bigfork Chert |
Geologic age | Middle Ordovician |
Lithologic constituents | Major
Sedimentary > Carbonate > Limestone (Bed)
Sedimentary > Clastic > Mudstone > Shale (Bed)
Sedimentary > Chemical > Chert (Bed)
|
Comments | Unit is found in many parts of Ouachita Range. Consists of close textured, even-bedded, brittle, dark-gray chert in layers 1 to 18 inches thick. Weathered parts look like sandstone. Is about 700 ft thick. Has been mapped as novaculite but it is not novaculite. (Purdue, 1909). |
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/geologyhttps://pubs.er.usgs.gov/publication/ofr96370 Marcher, M.V. and Bergman, D.L., 1983, Reconnaissance of the water resources of the McAlester and Texarkana quadrangles, southeastern Oklahoma: Oklahoma Geological Survey, Hydrologic Atlas 9, scale 1:250,000, 4 sheets. (Geology on sheet 1 compiled by M.V. Marcher and D.L. Bergman, in 1971 and revised by R.O. Fay, in 1978.)Cederstrand, J.R., 1996h, Digital geologic map of McAlester-Texarkana quadrangles, southeastern Oklahoma: U.S. Geological Survey Open-File Report 96-377, (3 diskettes), URL address is: http://ok.water.usgs.gov/gis/geologyhttps://pubs.er.usgs.gov/publication/ofr96377 Purdue, A.H., 1909, Structure and stratigraphy of the Ouachita Ordovician area, Arkansas: Geological Society of America Bulletin, pp.556-557. |
NGMDB product | |
Counties | Atoka - Latimer - McCurtain - Pushmataha |