|Name||Grayson Marl and Main Street Limestone, undivided|
|Geologic age||Early Late Cretaceous and Late Early Cretaceous|
Sedimentary > Carbonate > Marlstone
Sedimentary > Carbonate > Limestone
|Comments||Grayson Marl mostly marl, lt greenish-gray to med. gray, near top some thin interbeds of limest., nodular, sl. sandy, gray, fossiliferous; weathers grayish-yellow; thickness 15-60 ft. Main Street Limestone, thick ls beds, coarse grained, hard, interbedded with thin marl beds; yell-gray, white, brown; thikcness 10-20 ft.|
|Stratigraphic units||Bennington Limestone in Oklahoma|
Bureau of Economic Geology, 1967, Sherman Sheet, Geologic Atlas of Texas: University of Texas at Austin, 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.
|Counties||Bell - Bosque - Cooke - Coryell - Denton - Grayson - Hill - Johnson - McLennan - Tarrant|