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Blackwater Draw Formation

Blackwater Draw Formation
State Texas
Name Blackwater Draw Formation
Geologic age Phanerozoic | Cenozoic | Quaternary | Pleistocene
Comments Sand, fine- to medium-grained quartz, silty, calcareous, locally clayey, caliche nodules, massive, grayish red; distinct soil profile; thickness as much as 25 ft. feathers out locally.
Primary rock type sand
Secondary rock type silt
Other rock types clay or mud
Lithologic constituents
Major
Unconsolidated > Coarse-detrital > Sand (Bed)
Minor
Unconsolidated > Fine-detrital (Bed)
Incidental
Unconsolidated > Fine-detrital > Silt (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, 1977, Clovis Sheet, Geologic Atlas of Texas, Bureau of Economic Geology, University of Texas at Austin, scale 1:250,000.
Bureau of Economic Geology, 1983, Tucumcari Sheet, Geologic Atlas of Texas, Bureau of Economic Geology, University of Texas at Austin, scale 1:250,000.
Counties Andrews - Armstrong - Bailey - Borden - Briscoe - Castro - Cochran - Crane - Crosby - Dallam - Dawson - Deaf Smith - Donley - Ector - Floyd - Gaines - Garza - Glasscock - Hale - Hansford - Hartley - Hemphill - Hockley - Howard - Lamb - Lipscomb - Lubbock - Lynn - Martin - Midland - Ochiltree - Oldham - Parmer - Potter - Randall - Roberts - Sherman - Sterling - Terry - Upton - Wheeler - Winkler - Yoakum