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Ventioner Formation

Ventioner Formation
State Texas
Name Ventioner Formation
Geologic age Phanerozoic | Paleozoic | Carboniferous Pennsylvanian [Missouri]
Comments interbedded shale, sandstone, siltstone, and limestone. Shale- gray, black, maroon weathers tan and reddish brown, silty, sandy, locally laminated, thick beds, ferruginous nodules locally common; many sandy and silty lenses and flaggy, thin beds w/ horiz. lamination, ripple cross-lamination, local load and flute casts; some small, sandy channel-fill bodies to 6 ft thick w/ woody debris; fossil beds w/ marine invertebrates uncommon, fine-grained plant debris abdt. Sandstone and shale--ss units closely spaced, sheetlike and massive beds, trough cross stratified channel-fill bodies with shale clasts and plant debris, fine to med-grained, interbedded with shale and laminated siltst., thickness 15 to 40 ft. Limestonr-- tan to yellow, fine- to med-grained, thin beds and nodular, bioclastic mostly with algae, crinoids, fusulinids, and brachipods; merges with Ranger Limestone in subsurface; thickness 10-15 ft. Thickness of Ventioner Formation (revised) 200 to 270 ft
Primary rock type fine-grained mixed clastic
Secondary rock type medium-grained mixed clastic
Other rock types limestone
Lithologic constituents
Major
Sedimentary > Clastic > Mixed-clastic > Sandstone-Mudstone (Bed)
Minor
Sedimentary > Clastic > Mixed-clastic > Siltstone-Mudstone (Bed)
Incidental
Sedimentary > Carbonate > Limestone (Bed)
Map references
Bureau of Economic Geology, 1992, Geologic Map of Texas: University of Texas at Austin, Virgil E. Barnes, project supervisor, Hartmann, B.M. and Scranton, D.F., cartography, scale 1:500,000
Unit references
Bureau of Economic Geology, 1987, Wichita Falls-Lawton Sheet, Geologic Atlas of Texas: University of Texas at Austin, Bureau of Economic Geology, scale 1:250,000.
Counties Jack - Wise