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The chemical composition of each rock type of the Salt Wash member of the Morrison formation in the Jo Dandy area is remarkably uniform. The chemical composition of red mudstone cannot be distinguished from the chemical composition of green mudstone except for the concentration of calcium; red mudstone samples contain about twice as much calcium as green mudstone in the area studied. Oxidized sandstone contains somewhat more aluminum, manganese, and zirconium, and about half as much calcium, strontium, and copper, as unoxidized sandstone. Sandstone of the Jo Dandy area contains less aluminum, barium, zirconium, and manganese, but more potassium, magnesium, vanadium, nickel, and cobalt than "average'' sandstone of the Salt Wash. The unusual amount of bismuth in some samples of host rock in the Jo Dandy area, and the occurrence of bismuth in samples of gypsum suggest that bismuth and probably some potassium and magnesium in rocks of the Salt Wash member were derived from the Parailox member of the Hermosa formation. The persistently high concentrations of vanadium in the host rocks of the Jo Dandy area as compared to the vanadium content of average sandstone of the Salt Wash member suggests that vanadium may be useful as a pathfindermore » element in geochemical prospecting. (auth)« less

Distribution of chemical elements in the Salt Wash member of the Morrison formation, Jo Dandy area, Montrose County, Colorado