Cederstrand, J.R., 1996, 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>
Cederstrand, J.R., 1996, Digital geologic map of Clinton quadrangles, west-central Oklahoma: U.S. Geological Survey Open-File Report 96-373, (2 diskettes), URL address is: <http://ok.water.usgs.gov/gis/geology>
Cederstrand, J.R., 1996, Digital geologic map of Lawton quadrangles, southwestern Oklahoma: U.S. Geological Survey Open-File Report 96-376, (3 diskettes), URL address is: <http://ok.water.usgs.gov/gis/geology>
Cederstrand, J.R., 1996, 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>
Qal, Alluvium. Stream-laid deposits of sand, silt, clay, and gravel (Carr and Bergman, 1976).
Qt, Terrace deposits. Stream-laid deposits of sand, silt, clay, gravel, and volcanic ash (Carr and Bergman, 1976).
CRETACEOUS Kd and Kk, Outliers of the Kiowa Formation (Kk), dark-gray shale with some thin beds of fossiliferous tan limestone, range in thickness from a few feet to about 20 feet. Associated in some places is a 5- to 10-foot, gray to brown, coarse-grained sandstone and conglomerate assigned to the overlying Dakota Group, (Kd) (lower sandstone part). Several hundred outliers occur (generally too small to show on map) west of U.S. Highway 183, resting on units ranging from the Rush Springs Formation to the Elk City Sandstone (Carr and Bergman, 1976).
PERMIAN Pec, Elk City Sandstone. Reddish-brown, fine-grained sandstone with minor amounts of silt and clay, weakly cemented by iron oxide, calcium carbonate, and gypsum (Carr and Bergman, 1976).
Pdy, Doxey Shale. Reddish-brown, silty shale and siltstone (Carr and Bergman, 1976).
Pcc, Cloud Chief Formation. Reddish-brown to orange-brown shale, interbedded with siltstone and sandstone in the middle part and some dolomite and much gypsum in lower part.The Moccasin Creek Gypsum Member is at the base in southern Caddo County (Carr and Bergman, 1976).
Pr, Rush Springs Formation (Whitehorse Group). Orange-brown, cross-bedded, fine-grained sandstone with some dolomite and gypsum beds. Thickness, about 300 feet, thinning northward to about 186 feet (Carr and Bergman, 1976).
Prw, Weatherford Gypsum Bed (Whitehorse Group). Contains gypsum and dolomite (Havens, 1977).
Pm, Marlow Formation (Whitehorse Group). Orange-brown, fine-grained sandstone and siltstone, about 100 to 130 feet thick, thinning northward. This formation has 2 gypsum and (or) dolomite beds in upper 20 feet--the Emanuel Bed (at top) and the Relay Creek Bed (20 feet below top). Two thin, pink shales occur; the first is 1 foot below the top (Gracemont) and the second is 55 feet above the base (unnamed) (Carr and Bergman, 1976).
Pmv, Verden Sandstone Lentil (Whitehorse Group). A coarse-grained, calcareous, fossiliferous sandstone (2 to 10 feet thick) that occurs in the middle of the Marlow, about 25 feet below the Relay Creek Bed and 85 to 95 feet above the base (Carr and Bergman, 1976).
Per, El Reno Group. Primarily evaporites and reddish-brown shale, with deltaic clastics to the southeast. Where separate formations have not been distinguished, the El Reno Group is mapped as Per; the formations listed below have been distinguished and mapped within the Clinton quadrangle (Carr and Bergman, 1976) as part of the El Reno Group.
Pdc, Dog Creek Shale (El Reno Group). Reddish-brown shale with thin beds of siltstone and dolomite. Gradational southward and eastward into the Chickasha Formation and Duncan Sandstone (Carr and Bergman, 1976).
Pb, Blaine Formation (El Reno Group). 3 to 4 gypsum and dolomite beds 100 to 200 feet thick, separated by reddish-brown shale. Gradational southward and eastward into Chickasha Formation (Carr and Bergman, 1976).
Pf, Flowerpot Formation (El Reno Group). Reddish-brown shale containing several salt and gypsum beds in the upper part. Gradational southward and eastward into the Chickasha Formation and Duncan Sandstone (Carr and Bergman, 1976).
Pc, Chickasha Formation (El Reno Group). Variegated mudstone conglomerate and red-brown to orange-brown silty shale and siltstone, with minor amounts of orange-brown fine-grained sandstone (Bingham and Moore, 1975).
Pd, Duncan Sandstone (El Reno Group). Light-gray and reddish-brown, cross-bedded, fine-grained sandstone and mudstone conglomerate with some interbedded yellowish-gray and reddish-brown shales (Carr and Bergman, 1976).
Ppo, Post Oak Conglomerate. Limestone conglomerate near limestone outcrops; contains zeolite-opal (Tepee Creek Formation) locally, near gabbro and anorthosite outcrops; arkosic gravel and cobbles near igneous outcrops. These rock types are interbedded with sand, silt, clay, and shale, as much as 500 feet thick at surface by several thousand feet thick in subsurface extending down section into Pennsylvanian rocks (Havens, 1977).
Phy, Hennessey Group. Reddish-brown to gray shale with some tan sandstones (locally unconformable on Cambrian igneous rocks (Havens, 1977).
ORDOVICIAN Ovb, Viola Limestone and Bromide Formation. Limestone, interbedded limestone and shale, and sandstone; thickness, about 900 feet, faulted in isolated areas, top eroded, base covered (Havens, 1977).
Owk, West Spring Creek Formation and Kindblade Formation (Upper part of Arbuckle Group). Dolomite, dolomitic sandstone, conglomerate, and limestone; thickness, approximately 2,000 feet (Havens, 1977).
Ocm, Cool Creek Formation and McKenzie Hill Formation (Upper part of Arbuckle Group). Limestone and conglomerate with abundant quartz sand and cherty zones; thickness, approximately 2,000 feet (Havens, 1977).
CAMBRIAN Cat and Cb, lower part of Arbuckle Group and Timbered Hills Group. Limestone, dolomite, siltstone, sandstone, conglomerate, and shale, with glauconitic and hematitic zones; thickness, 1,200 to 2,000 feet, faulted in isolated areas. Lower part of Arbuckle Group includes Signal Mountain Formation, Royer Dolomite, and Fort Sill Limestone; Timbered Hills Group includes Honey Creek Formation and Reagan Sandstone (Havens, 1977) (Carr and Bergman, 1976).
Ccr, Carlton Rhyolite Group. Rhyolite flows, tuffs, conglomerate beds, and diabase sills; thickness, 4,500 feet (Havens, 1977).
Cwg, Wichita Granite Group. Granites of various textures; thickness, 600 to 15,000 feet (Havens, 1977).