Neylandville and Marlbrook Marls, undivided

Neylandville and Marlbrook Marls, undivided
State Texas
Name Neylandville and Marlbrook Marls, undivided
Geologic age Late Cretaceous; Gulfian Series
Lithologic constituents
Major
Sedimentary > Clastic > Mudstone > Claystone (Bed)
Comments Clay, dominantly montmorillonitic, silt-size quartz becomes more abdt upward, calcite fragments common, glauconitic, disseminated pyrite, blocky with conchoidal fracture, strikingly uniform throughout, lt. med. gray, weathers lt brown to lt. gray and becomes sl. fissile; phosphate nodules locally, marine megafossils, thickness 450-475 ft.
References

Bureau of Economic Geology, 1972, Dallas sheet, Geologic Atlas of Texas, Bureau of Economic Geology, University of Texas at Austin, 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 Ellis - Falls - Hill - Kaufman - Limestone - McLennan - Milam - Navarro - Rockwall - Travis