Timbered Hills Group

ARDMORE-SHERMAN- "Honey Creek Limestone," above, is gray, fine grained; grades eastward into dolomite; thickness 90 to 250 feet. "Reagan Sandstone," at base, is brown, coarse grained; thickness, 60 to 450 feet. Occurs in the ARBUCKLE MTNS.
State Oklahoma
Name Timbered Hills Group
Geologic age Late Cambrian
Lithologic constituents
Sedimentary > Clastic > Sandstone (Bed)
Sedimentary > Carbonate > Dolostone (Bed)
Sedimentary > Carbonate > Limestone (Bed)
Comments Timbered Hills Group: Named for East and West Timbered Hills of Arbuckle Mountains, South Oklahoma folded belt province. Group consists of (ascending): Reagan sandstone, brown quartzite and arkose conglomerate and coarse sandstones becoming limy at top, 460 ft thick; and Honey Creek formation, gray, crystalline, fossiliferous limestone containing glauconite, 124 ft thick. (Decker, 1939).

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: http://ok.water.usgs.gov/gis/geology


Decker, C.E., 1939, Two Lower Paleozoic groups, Arbuckle and Wichita Mountains, Oklahoma: Geological Society of America Bulletin, vol.50, no.8, pp.1311-1322.

NGMDB product
Counties Atoka - Johnston - Murray