Malone Formation

Malone Formation
State Texas
Name Malone Formation
Geologic age Late Jurassic
Lithologic constituents
Sedimentary > Carbonate > Limestone (Bed)
Sedimentary > Clastic > Mixed-clastic > Sandstone-mudstone (Bed)
Sedimentary > Chemical > Evaporite > Gypsum (Bed)
Comments Limestone, shale, siltstone, sandstone, gypsum and conglomerate. Upper part--mostly limestone aphanitic up to 25 ft of brownish-yell sandst. and limest at top. Lower part--complexly interfingered sandstone, siltstone, shale, limestone, and conglomerate., some impure gypsum. short-distance lateral facies changes common. Mostly sandy shale and siltstone at NW end of Malone Mtns, grades SE to mostly sandst. Jurassic ammonites. Thickness 150-1,000 + ft. Malone Mtns in Hudspeth Co. are only about 10 sq. mi in area just north of I-80 midway between El Paso and Van Horn. Only Jurassic outcrops in west Trans-Pecos. According to Albritton (1937) the Malone consists of a lower division of ls., conglo., sandst., sandy shale, and impure ls., and upper division dominantly impure ls. Max. thickness about 1,000 ft. Unconformably overlies Permian strata.

Bureau of Economic Geology, 1976, Pecos Sheet, Geologic Atlas of Texas: University of Texas at Austin, Bureau of Economic Geology, scale 1:250,000.

Albritton, C.C., Jr., 1937, Field and Laboratory, v. 5, no. 2. p. 48-50.

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 Hudspeth