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Union Valley Formation

ARDMORE-SHERMAN- Limestone, gray, fine- to medium-grained, IPul, 12 to 25 feet thick; with sandstone, IPus, below, fine- to medium-grained, about 150 to 260 feet thick. Occurs in the ARBUCKLE MTNS
StateOklahoma
NameUnion Valley Formation
Geologic agePhanerozoic | Paleozoic | Carboniferous Pennsylvanian-Early
Original map labelIPul
CommentsComments: Revised as basal formation of Springer group of Morrow series of the Bendian period. Formerly called Union Valley sandstone. Is a very widespread deposit and sandstones in most areas make up ridges of moderate relief. Found in east-central OK immediately south of Choctaw fault from vicinity of Limestone Gap to AR State line. "Typical exposure" is in the Ouachita Mountains in sec 36, T1S, R12E, Atoka Co; here it consists of gray to dark-gray shale and intercalated massive and thin-bedded greenish-yellow, limonitic, fine to medium subangular sandstone. Commonly casehardened by silica. Thickness is uniform and about 360 ftat most places in the Ouachita Mountains. Includes Stapp conglomerate member (new) at base. (Harlton, 1938)
Primary rock typelimestone
Secondary rock type
Other rock types
Lithologic constituents
Major
Sedimentary > Carbonate > Limestone (Bed)
Map references
Heran, W. D., Green, G. and Stoeser, D. B., 2003, A Digital Geologic Map Database of Oklahoma: U. S. G. S. Open File Report 03-247
Unit references
Heran, W. D., Green, G. and Stoeser, D. B., 2003, A Digital Geologic Map Database of Oklahoma: U. S. G. S. Open File Report 03-247
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
Harlton, B. H., 1938, Stratigraphy of the Bendian of the Oklahoma salient of the Ouachita Mountains: Bulletin of the American Association of Petroleum Geologists, vol.22, no.7, pp.852-914
Geographic coveragePontotoc

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