USGS - science for a changing world

Mineral Resources On-Line Spatial Data

Mundy Breccia and Castner Limestone, undivided

Mundy Breccia and Castner Limestone, undivided
StateTexas
NameMundy Breccia and Castner Limestone, undivided
Geologic agepreCambrian-Proterozoic
Original map labelpCmc
Primary rock typelimestone
Secondary rock typebasalt
Other rock typeshornfels; conglomerate; dolostone (dolomite); diabase
Lithologic constituents
Major
Sedimentary > Carbonate (Bed)Castner Limestone includes hornfels, conglomerate, dolomite, and diabase and is mostly light gray, green, and blue limestone, fine to coarse grained, lt. gray chert lenses, thin bedded, irreg. bedded in upper one-third; metamorphic minerals such as serpe
Minor
Metamorphic > Granoblastic > Hornfels (Hornfels)hornfels present in the upper third of the Castner Limestone, thus is ranked a minor part of the whole map unit (Mundy Breccia and Castner Limestone, undivided). Hornfels very fine grained, dark gray, in many thin beds, laminated and contains a few beds
Incidental
Sedimentary > Carbonate (Bed)Dolomite in the basal exposed beds of the Castner Limestone in the Franklin Mtns. The dolomite is white to light gray, one bed contains algal structures
Tectonite > CataclastiteThe Mundy Breccia randomly oriented, black basalt boulders, angular to slightly rounded, in matrix of dark gray mudstone. thickness about 90 ft, as much as 250 ft maximum.
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, 1968, Van Horn-El Paso Sheet, Geologic Atlas of Texas: Bureau of Economic Geology, The University of Texas at Austin, scale 1:250,000.
Harbour,R.L., 1960, American Association of Petroleum Geologists Bulletin v. 44, no. 11, p. 1788-1790.
Geographic coverageEl Paso

Show this information as [XML] - [JSON]

AccessibilityFOIAPrivacyPolicies and Notices

Take Pride in America logoUSA.gov logoU.S. Department of the Interior | U.S. Geological Survey
URL: http://mrdata.usgs.gov/geology/state/sgmc-unit.php?unit=TXpCAmc;0
Page Contact Information: Peter Schweitzer