Wewoka Formation

OKLAHOMA CITY- Interbedded fine- to medium-grained sandstone and calcareous shale. Thickness ranges from 400 to 750 feet. FORT SMITH- Shale, sandstone, and minor limestones ARDMORE-SHERMAN- Shale, blue-gray, sandstone, chert conglomerate, and limestone conglomerate; thickness, 400 feet.
State Oklahoma
Name Wewoka Formation
Geologic age Middle Pennsylvanian
Lithologic constituents
Major
Sedimentary > Clastic > Mudstone > Shale (Bed)
Sedimentary > Clastic > Sandstone (Bed)
Minor
Sedimentary > Clastic > Conglomerate (Bed)
Sedimentary > Carbonate > Limestone (Bed)
Comments Named from town of Wewoka, Seminole Co, OK, Arkoma basin and Chautauqua platform. Is a succession of massive, mostly friable sandstones and shales--7 alternating beds in all--from 40 to 130 ft thick; total thickness of formation 700 ft. Consists of (ascending): 1) sandstone division, which is thinner, but generally harder, than succeeding 3 sandstone divisions. At base of this division are local indurated beds of sandy chert conglomerate, which thin east and north; 2) Next is fossiliferous, friable blue clay shale 120 ft thick, ending locally in thin, white, fossiliferous limestone. 3) Succeeding sandstone member is about 110 ft thick; beds are massive and friable, breaking down into loose sand and weathering into rounded ledges. 4) Next is soft, fossiliferous blue clay shale nearly 130 ft thick; remarkable for abundant, perfectly preserved fossil shells. 5) Next is 60-ft thick sandstone bed. 6) Next is a 45-ft shale bed. 7) At top is sandstone member estimated 100 ft thick. Uppermost beds of this topmost member are shaly, and culminate in a shaly sandy limestone. (Taff, 1901).
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

Bingham, R.H. and Moore, R.L., 1975, Reconnaissance of the Water Resources of the Oklahoma City quadrangle, central Oklahoma: Oklahoma Geological Survey, Hydrologic Atlas 4, Scale 1:250,000, 4 sheets. (Geology on sheet 1 compiled by R.H. Bingham and R.O. Fay, 1973.)

Cederstrand, J.R., 1996i, Digital geologic map of Oklahoma City quadrangles, central Oklahoma: U.S. Geological Survey Open-File Report 96-378, (2 diskettes), URL address is: http://ok.water.usgs.gov/gis/geology

https://pubs.er.usgs.gov/publication/ofr96378

Marcher, M.V., 1969, Reconnaissance of the water resources of the Fort Smith quadrangle, east-central Oklahoma: Oklahoma Geological Survey, Hydrologic Atlas 1, scale 1:250,000, 4 sheets. (Geology on sheet 1 compiled by M.V. Marcher, in 1967.)

Cederstrand, J.R., 1996f, Digital geologic map of Fort Smith quadrangles, east-central Oklahoma: U.S. Geological Survey Open-File Report 96-375, (2 diskettes), URL address is: http://ok.water.usgs.gov/gis/geology

https://pubs.er.usgs.gov/publication/ofr96375

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

Taff, J.A., 1901, Description of the Colgate quadrangle [Indian Territory]: U.S. Geological Survey Geologic Atlas of the United States, Folio 74.

https://pubs.er.usgs.gov/publication/gf74

NGMDB product
Counties Carter - Hughes - Okfuskee - Okmulgee - Pontotoc - Seminole - Tulsa - Wagoner