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Blackwater Draw Formation

Blackwater Draw Formation
StateTexas
NameBlackwater Draw Formation
Geologic agePhanerozoic | Cenozoic | Quaternary | Pleistocene
Original map labelQbd
CommentsSand, 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 typesand
Secondary rock typesilt
Other rock typesclay 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.
Geographic coverageAndrews - Armstrong - Bailey - Borden - Briscoe - Carson - Castro - Cochran - Crane - Crosby - Dallam - Dawson - Deaf Smith - Dickens - Donley - Ector - Floyd - Gaines - Garza - Glasscock - Gray - Hale - Hansford - Hartley - Hemphill - Hockley - Howard - Hutchinson - Lamb - Lipscomb - Lubbock - Lynn - Martin - Midland - Moore - Motley - Ochiltree - Oldham - Parmer - Potter - Randall - Reagan - Roberts - Sherman - Sterling - Swisher - Terry - Upton - Wheeler - Winkler - Yoakum

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URL: http://mrdata.usgs.gov/geology/state/sgmc-unit.php?unit=TXQbd;0
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