Hunton Group

ARDMORE-SHERMAN- Marlstone, shale, and limestone, buff, ranging in age from Early Silurian to Early Devonian; thickness, 100 to 700 feet, with many unconformities Occurs in the ARBUCKLE MTNS.
State Oklahoma
Name Hunton Group
Geologic age Early Devonian to Early Silurian
Lithologic constituents
Sedimentary > Carbonate > Limestone (Bed)
Sedimentary > Carbonate > Marlstone (Bed)
Sedimentary > Clastic > Mudstone > Shale (Bed)
Comments Named for village of Hunton, Johnston Co, OK in the South Oklahoma folded belt province. No type locality designated. Occurs in northwestern part of Atoka quad where it is 150 ft thick, and to west in Arbuckle uplift where it reaches 300-ft thickness. Forms sharp ridges and terraced hills. Is nearly pure limestone and limy marls. At base are variable beds of white oolite followed by bluish and cream-colored granular and fine-textured limestones and marly beds. Some beds are hard and crystalline, some composed largely of shell fragments. Near top are marly beds containing abundant fossils. Uppermost 50 ft is hard and thin-bedded, with chert concretions and fossils. (Taff, 1902). Revised as group; divided into formations (ascending): Chimneyhill Limestone, Henryhouse Shale, Haragan Shale, and Bois d'Arc Limestone (Reeds, 1911). Divided into Keel, Cochrane, and Clarita Formations of Chimneyhill Subgroup (Amsden, 1967).

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.

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:

Amsden, T.W., 1967, Chimneyhill Limestone sequence (Silurian), Hunto Oklahoma, Revised: American Association of PetroleumGeologists Bulletin, v. 51, no. 6, p. 942-945.

Reeds, C.A., 1911, The Hunton Formation of Oklahoma: American Journ. Science, 4th series, v. 32, no. 190, p. 256-268.

NGMDB product
Counties Atoka - Carter - Coal - Johnston - Love - Marshall - Murray - Pontotoc