Skip to main content

Marlbrook Marl

Marlbrook Marl
State Texas
Name Marlbrook Marl
Geologic age Phanerozoic | Mesozoic | Cretaceous-Late [Gulfian]
Comments Clay, calcareous, variable amount of silt and glauconite, limestone bed in so. Collin Co. 10-13 inches thick, aphanitic, lt. gray, forms scarp 180 ft above base; light yell-gray, marine megafossils, thickness 300 +- ft.
Primary rock type clay or mud
Secondary rock type limestone
Other rock types
Lithologic constituents
Major
Unconsolidated > Fine-detrital > Clay (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, 1967, Sherman Sheet, Geologic Atlas of Texas: University of Texas at Austin, Bureau of Economic Geology, scale 1:250,000.
Counties Bowie - Collin - Delta - Fannin - Hunt - Lamar - Red River