Holdenville Formation or Holdenville Shale (OKPAh;0)

OKLAHOMA CITY- "Holdenville Shale"- Mainly clay shale with some interbedded fine-grained calcareous sandstone locally containing beds of crystalline limestone. Thickness ranges from 100 to 280 feet. FORT SMITH- "Holdenville Shale"- Shale, thin sandstone and minor limestones. ARDMORE-SHERMAN- "Holdenville Formation"- Shale, blue-gray, with light-brown sandstones and chert conglomerates and 2 prominent limestones--the upper, or "Sasakwa Limestone," white, fine-grained, 1 to 15 feet thick, 35 feet below the top, and the lower, or "Homer Limestone," dark-brown, sandy, 2 to 10 feet thick, 40 to 70 feet below the Sasakwa. Thickness, 210 to 260 feet. (Upper Franks Conglomerate)

State	Oklahoma
Name	Holdenville Formation or Holdenville Shale
Geologic age	Phanerozoic \| Paleozoic \| Carboniferous Pennsylvanian-Middle
Original map label	IPh
Comments	Comments: Probably named for Holdenville, Hughes Co, OK. Coalgate quad, OK, where unit is exposed only in small, triangular area in northwest corner of quad, in Hughes Co, Chautauqua platform, is 250 ft thick. Surface of formation becomes broader northward in the more level country about Holdenville, 3 mi north of border of quad. Composed of friable blue clay shale, with local thin beds of shelly limestone and shaly calcareous sandstone in upper part. Sandstone ledges outcrop in terraces around the slopes of the hills bordering north side of Little River. The thin limestone occurs about 35 ft below top of formation, and its outcrop is usually covered by the sandstone and conglomerate debris from the overlying [Wewoka] formation. In its usual exposure 1-2 ft only of shaly limestone may be seen. At other places a bed of shell breccia loosely cemented is found, representing the thin, hard plates of the shelly rock. The shales are rarely exposed. (Taff, 1901)
Primary rock type	shale
Secondary rock type	sandstone
Other rock types	conglomerate; limestone
Lithologic constituents	Major Sedimentary > Clastic > Conglomerate (Bed) Sedimentary > Clastic > Sandstone (Bed) Sedimentary > Clastic > Mudstone > Shale (Bed) Minor 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 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 [http://ok.water.usgs.gov/gis/geology/ftsmith.html] [http://ok.water.usgs.gov/gis/geology] 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 [http://ok.water.usgs.gov/gis/geology/ardmore.html] [http://ok.water.usgs.gov/gis/geology] Taff, J. A., 1901, Description of the Colgate quadrangle [Indian Territory]: U.S. Geological Survey Geologic Atlas of the United States, Folio 74. [http://pubs.er.usgs.gov/publication/gf74]
Geographic coverage	Creek - Hughes - Okfuskee - Okmulgee - Pontotoc - Seminole - Tulsa