| State | Oklahoma |
|---|---|
| Name | Bokchito Formation |
| Geologic age | Early Cretaceous |
| Lithologic constituents |
Major
Sedimentary > Clastic > Mudstone > Claystone (Bed)
Minor
Sedimentary > Carbonate > Limestone (Bed)
Sedimentary > Clastic > Sandstone (Bed)
|
| Comments | Lowermost 90 ft is sandy clay shale with some ferruginous limestone segregations and ironstone nodules; above these are 20-30 ft of friable sandstone followed by bluish shell limestones separated by friable shales. Limestone is hard, semicrystalline, and on weathering turns yellowish brown or reddish. At top of formation are 50 ft of sandy and clay shales and, locally, friable sandstone strata; shows cross- bedding in places. Total thickness of formation is 140 ft. Ouachita Mountain uplift; S. OK folded belt province. |
| 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 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/geologyhttps://pubs.er.usgs.gov/publication/ofr96370 |
| NGMDB product | |
| Counties | Bryan - Love - Marshall |