Chisholm Shale

Usage of Geologic Unit Name:
Chisholm Formation (NV,UT)
Chisholm Shale (NV*,UT*)
Cambrian, Middle*
Great Basin province*
Type Locality:
Vicinity of Chisholm Mine and Half Moon Gulch, 2 to 3 mi northwest of Pioche [Pioche 7.5' quad], Lincoln Co., NV (Walcott, 1916).
Unit Name History:
Named as Chisholm Shale; Biostratigraphic dating (Walcott, 1916). Adopted (Westgate and Knopf, 1932). Revised; Redescribed as Chisholm Formation; Areal limits (Hintze, 1980).

Walcott, C.D., 1916, Cambrian geology and paleontology, III; No. 5, Cambrian trilobites: Smithsonian Miscellaneous Collections, v. 64, p. 303-456.

Westgate, L.G. and Knopf, Adolph, 1932, Geology and ore deposits of the Pioche district, Nevada: U.S. Geological Survey Professional Paper, 171, 79 p., (incl. geologic map, scale 1:62,500).

Hintze, L.F., 1980, Preliminary geologic map of the Sand Pass quadrangle, Juab and Millard Counties, Utah: U.S. Geological Survey Miscellaneous Field Studies Map, MF-1151, 1 sheet, scale 1:24,000

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Last modified:8/10/2006