Gorman Formation (TXOg;0)

State	Texas
Name	Gorman Formation
Geologic age	Phanerozoic \| Paleozoic\| Ordovician-Early
Original map label	Og
Comments	Limestone and dolomite, thickly to thinly bedded, cherty; ls. chiefly in upper part, aphanitic, v. lt-gray; dolomite mostly present in lower part, microgranular to fine-grained, various shades of pink, gray, and yellowish-gray; v. sparsly fossiliferous, Archaeoscyphia structure preserved in chert nodules common in a bed near middle; thickness 425 to 490 ft where overlain by Honeycut Fm., in area of truncation completely eroded locally.
Primary rock type	limestone
Secondary rock type	dolostone (dolomite)
Other rock types
Lithologic constituents	Major Sedimentary > Carbonate > Limestone (Bed) Sedimentary > Carbonate > Dolostone (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, 1981, Llano sheet, Geologic Atlas of Texas, Bureau of Economic Geology, University of Texas at Austin, scale 1:250,000. Bureau of Economic Geology, 1976, Brownwood sheet, Geologic Atlas of Texas, Bureau of Economic Geology, University of Texas at Austin, scale 1:250,000.
Geographic coverage	Blanco - Burnet - Gillespie - Kimble - Lampasas - Llano - McCulloch - Mason - Menard - San Saba