Fredericksberg Group and Maxon Sandstone, undivided (TXKem;0)

State	Texas
Name	Fredericksberg Group and Maxon Sandstone, undivided
Geologic age	Phanerozoic \| Mesozoic \| Cretaceous-Early [Comanchean]
Original map label	Kem
Comments	Fredericksberg Group--Limestone,dolomite,chert, marl. Limestone nodular, aphanitic, marly, gray, yell, white, pink; dolomite, find grained, gray; chert, in thin layers and nodules; marl locally gypsiferous, gray. abundant Exogyra texana some beds made almost entirely of Gryphaea sp., exposed thickness 50 ft in Hobbs Sheet (1976). Maxon Ss fine grained, calcareous, well cemented to friable, massive to bedded; limestone nodular to bedded, hard to soft. thickness of Maxon Ss 114 ft in area of Santiago Mtns, feathers out east and south short of Big Bend Natl Park and Black Gap area.
Primary rock type	sandstone
Secondary rock type	limestone
Other rock types	dolostone (dolomite)
Lithologic constituents	Major Sedimentary > Carbonate > Marlstone (Bed) Sedimentary > Carbonate > Limestone (Bed) Minor Sedimentary > Carbonate > Dolostone (Bed) Incidental Sedimentary > Clastic > Sandstone (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, 1979, Emory Peak--Presidio Sheet, Geologic Atlas of Texas, University of Texas at Austin. Bureau of Economic Geology, 1967, Sherman Sheet, Geologic Atlas of Texas: University of Texas at Austin, Bureau of Economic Geology, scale 1:250,000.
Geographic coverage	Brewster - Pecos