Mississippi, Devonian, and Ordovician rocks, undivided (TXMDO;0)

State	Texas
Name	Mississippi, Devonian, and Ordovician rocks, undivided
Geologic age	Phanerozoic \| Paleozoic \| Ordovician Devonian Carboniferous Mississippian
Original map label	MDO
Comments	on west side of Solitario Uplift (southeast edge of Presidio Co.) includes Caballos Novaculite and Maravillas Fm.; in Tinaja Mtns (south edge of Marathon anticlinorium) includes various combinations of Caballos Novaculite, Maravillas Fm., Woods Hollow Shale, Fort Pena Fm., and upper part of Marathon Limestone.
Primary rock type	novaculite
Secondary rock type	limestone
Other rock types	chert; shale
Lithologic constituents	Major Sedimentary > Chemical > Novaculite (Bed) Minor Sedimentary > Clastic > Mudstone > Shale (Bed) Sedimentary > Carbonate > Limestone (Bed) Sedimentary > Chemical > Chert (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.
Geographic coverage	Presidio