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The Little Black Canyon 7.5* quadrangle is located in Malheur County, Oregon, about 50 km west of the town of Vale. Principal access is by U.S. Highway 20, north 1.6 km from Highway 20 to the town of Harper, and west and northwest from Harper following dirt roads that lead to the eastern part of the quadrangle (fig. 1). Some formations in the quadrangle were first named and described by Bowen and others (1963) and Kittleman and others (1965). A reconnaissance geologic map (scale 1:63,360) that includes the quadrangle was made by Haddock (1967) as part of a study of the Dinner Creek Welded Tuff of the Malheur Gorge area. Haddock's mapping was incorporated into a geologic map of the Owyhee region at the scale of 1:125,000 (Kittleman and others, 1967), a geologic map of eastern Oregon at the scale of 1:500,000 (Walker, 1977), and a geologic map of the State of Oregon at the scale of 1:500,000 (Walker and MacLeod, 1991). The quadrangle is included in the west half of the Boise 1° x 2° Sheet which was mapped at the scale of 1:24,000 during a cooperative program (COGEOMAP) between the U.S. Geological Survey and the Oregon Department of Geology and Mineral Industries. Geologic mapping of the Little Black Canyon quadrangle at the scale of 1:24,000 was incorporated into the geologic map of the Vale 30 x 60 minute quadrangle (Ferns and others, 1993) at the Scale of 1:100,000. The volcanic rock classification used in this report is by Le Bas and others (1986). The correlations between radiometric ages and geologic ages is by Palmer (1983).

Geologic map of the Little Black Canyon Quadrangle, Malheur County, Oregon