McKnight Formation

McKnight Formation
State Texas
Name McKnight Formation
Geologic age Early Cretaceous
Lithologic constituents
Sedimentary > Clastic > Mudstone > Shale > Black-shale (Bed)
Sedimentary > Carbonate > Limestone (Bed)
Unconsolidated > Marl (Bed)
Sedimentary > Chemical > Chert (Bed)
Comments Limestone and shale. Upper 55 ft, lime mudst., thin bedded, locally contains chert layers, solution zones, and collapse breccia; intermediate 25 ft argill. lime mudst., laminated, fissile, black; lower 70 ft limest. ganular, thin chert layers, abdt shell fragments and pellets, overlain by lime mudst. with solution zone and collapse breccia; total thicknes 150 ft

Bureau of Economic Geology, 1974, San Antonio Sheet, Geologic Atlas of Texas, University of Texas, Bureau of Economic Geology, scale 1:250,000.

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.

NGMDB product
Counties Kinney - Uvalde