Ordovician rocks, undivided (TXO;0)

State	Texas
Name	Ordovician rocks, undivided
Geologic age	Phanerozoic \| Paleozoic\| Ordovician
Original map label	O
Comments	includes Woods Hollow Shale, Fort Pena Formation, and upper parta of Marathon Limestone northwest side of The Solitario, east edge of Presidio County
Primary rock type	limestone
Secondary rock type	shale
Other rock types
Lithologic constituents	Major Sedimentary > Clastic > Mudstone > Shale (Bed) Sedimentary > Carbonate > Limestone (Bed) Minor Sedimentary > Clastic > Sandstone (Bed) Incidental 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	Brewster - Presidio