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Mount Blanco
Mount Blanco is a small white hill — an erosional remnant — located on the eastern border of the Llano Estacado within Blanco Canyon in Crosby County, Texas.〔Holliday, V.T. 1988. Mt. Blanco revisited: soil-geomorphic implications for the ages of the Upper Cenozoic Blanco and Blackwater Draw Formations. Geology 16(6):505-508.〕 It is the type locality of the Blanco Formation and Blancan Fauna, which occurs throughout North America.〔Cope, E.D. 1892. A contribution to a knowledge of the fauna of the Blanco beds of Texas. Proceedings of the Academy of Natural Sciences of Philadelphia 44:226-229.〕〔Schultz, G.E. 1977. Blancan and post-Blancan faunas in the Texas Panhandle. In: Schultz, G.E. (ed), Guidebook: Field conference on late Cenozoic biostratigraphy of the Texas Panhandle and adjacent Oklahoma: West Texas State University, Kilgore Research Center, Special Publication 1, pp. 105-145.〕
==Geology==
The term "Blanco Canyon beds", later shortened to "Blanco beds", was first applied to this formation in 1890 by William F. Cummins of the Geological Survey of Texas.〔Cummins, W.F. 1890. The Permian of Texas and its overlying beds. In: Dumble, E.T. (ed), First annual report of the Geological Survey of Texas 1889, pp. 183-197.〕 The Blanco beds are considered to be of lacustrine origin – deposited in a Pleistocene lake basin set in the Ogallala formation of Pliocene age which underlies the upper surface sediments of the Llano Estacado.〔Izett, G.A., Wilcox, R.E., and Borchardt, G. 1972. Correlation of a volcanic ash bed in Pleistocene deposits near Mount Blanco, Texas, with the Guaje Pumice Bed of the Jemez Mountains, NM. Quaternary Research 2:554-578.〕 The thickness of the Blanco beds varies from around thick at the most.〔Evans, G.L. 1948. Geology of the Blanco beds of West Texas. In: Colbert, E.H. (ed), Pleistocene of the Great Plains (symposium). Geological Society of America Bulletin No. 59, pp. 617-619.〕 The formation mainly consists of light-gray fine-grained mudstone, sandstone, and some conglomerate. These light-colored sediments contrast sharply with the rust-colored sediments of the Ogallala Formation.
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