Blanco Formation

Blanco Formation
State Texas
Name Blanco Formation
Geologic age Pliocene
Lithologic constituents
Major
Unconsolidated > Coarse-detrital > Sand (Bed)
Minor
Unconsolidated > Coarse-detrital > Gravel (Bed)
Unconsolidated > Fine-detrital > Clay (Bed)
Sedimentary > Carbonate > Limestone (Bed)
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.
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.

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.

NGMDB product
Counties Crosby - Lubbock