Blanco Formation (TXPOb;0)

State	Texas
Name	Blanco Formation
Geologic age	Phanerozoic \| Cenozoic \| Tertiary \| Pliocene
Original map label	Pob
Comments	Sand, clay, limestone, gravel. Coarser with more gravel toward margin of deposit; weathers glaring white. Sand, fine to med. grained quartz, bedded to massive, light greenish gray, white, gray. Clay, silty, sandy, bentonitc, calcareous in part. Limestone, white, flaggy, thinbedded. Molluscan and vertebrate fossils. Thickness 75 ft, pinches out laterally.
Primary rock type	sand
Secondary rock type	clay or mud
Other rock types	limestone; gravel
Lithologic constituents	Major Unconsolidated > Coarse-detrital > Sand (Bed) Minor Unconsolidated > Coarse-detrital > Gravel (Bed) Sedimentary > Carbonate > Limestone (Bed) Unconsolidated > Fine-detrital > Clay (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	Izett, G.A., Wilcox, R.E., and Borchardt, G.A., 1972, Air-fall volcanic ash bed in lower Pleistocene deposits near Mount Blanco, Texas [abs.]: in Rocky Mountain Section, 25th Annual Meeting, Geological Society of America, v. 4, no. 6, p. 384. Bureau of Economic Geology, 1983, Lubbock Sheet, Geologic Atlas of Texas: University of Texas at Austin, Bureau of Economic Geology, scale 1:250,000.
Geographic coverage	Crosby - Lubbock