Bokchito Formation

ARDMORE-SHERMAN- Clay, illitic, kaolinitic, with some tan limestones and sandstones. Subdivided into "Pawpaw Clay" at top, 40 to 60 feet thick; "Quarry Limestone," 13 feet thick; "Weno Clay," 100 to 135 feet thick; and basal "Denton Clay," 50 to 70 feet thick.
State Oklahoma
Name Bokchito Formation
Geologic age Early Cretaceous
Lithologic constituents
Sedimentary > Clastic > Mudstone > Claystone (Bed)
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.
NGMDB product
Counties Bryan - Love - Marshall