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The rate of degradation by solution on the northeast flank of the Wind River Range is twice that on the southwest flank about 49 and 26 tons per square mile per year, respectively. Conversely, the stream runoff on the southwest flank is about 1% times that on the northeast. This seeming anomaly is due principally to the erosive nature of a girdling band of pre-Tertiary rocks exposed on the northeast flank. Five drainage basins are selected on the southwest side of the mountains and six on the northeast side as representative samples of the geologic terranes. The computed discharge-weighted concentrations of dissolved solids range from 25 to 34 parts per million on the southwest and from 37 to 276 parts per million on the northeast. Techniques used in the computations of chemical degradation rates include: adjustment of short-term flow-duration curves to a base 1914-57 period, correlation of chemical concentrations with water discharges, calculation of solute yield from flow duration curves and discharge-concentration correlations, and correction of gross yields for soluble material in precipitation. CHEMICAL DEGRADATION The term "chemical degradation" applies only to the removal of rock material by corrosion, or chemical erosion, and the subsequent transport of the dissolved products. Because of its setting and the amount of chemical, hydrologic, and geologic data available, the Wind Eiver Eange is an excellent pilot area for quantitative study of corrosion rates in different geologic and hydrologic environments. The central part of the Wind Eiver Mountains is a rugged wilderness of granitic spires and massive buttresses that were formed by prolonged erosion of the anticlinal range. The higher, or more central, part is a large plateau that bears the imprint of past and present glaciation^ Myriad sparkling lakes of glacial origin form a band astride the sometimes indistinct continental divide. On the B-l E-2 GEOCHEMISTRY OF WATER western side, where glaciers in times past have spilled off the high plateau into the valleys below, great glacier-gouged lakes protrude likes tongues from the mountain canyons. For a number of miles along the highest ridge, which reaches an altitude of 13,785 feet at the top of Gannett Peak, Dinwood, and Bull Lake Glaciers are still actively eroding their cirques. The area of exposed granitic rocks is about 125 miles long and 25 miles wide. (See fig. 1.) On the northeast side of the mountains,, erosion has stripped away the nearly horizontal Tertiary rocks,, which at one time almost covered the Paleozoic and Mesozoic rocks that dip steeply to the northeast. These latter rocks, of varying degrees of erosibility, form a broad band along the northeast side of the range. On the southwest side of the range, rocks of these ages

Chemical degradation on opposite flanks of the Wind River range, Wyoming