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acre-foot AREA OF DAKOTA Arkansas River ball on downthrown basal Glencairn sandstone Celsius Charles Canyon fault Colorado Creek Canyon Member Dakota aquifer Dakota Sandstone Dakota-Purgatoire sequence dissolved-solids concentration downthrown side Dry Creek Canyon Entrada Sandstone estimated transmissivity EXPLANATION OUTCROP AREA fault gouge FAULT—Bar and ball feet per day flow-net analysis Formation Lytle Sandstone Fountain Formation ft/mi Galbeth Creek fault Glencairn Shale Member graben ground-water flow patterns hydraulic conductivity hydraulic head inferred interformational flow KILOMETERS EXPLANATION OUTCROP leakage lithology lower sandstone unit Lytle Sandstone Member mapped area Morrison Formation northeast northwest-trending overlying Graneros Shale Pueblo Purgatoire Formation Lytle Ralston Creek Formation recharge and discharge Red Creek fault Rock Creek fault Rock Hill fault Rush fault SANDSTONE AND PURGATOIRE Scott shale layers siltstone southeast southwest specific capacities specific conductance strata stratigraphic offset study area syncline thickness U.S. Geological Survey UNDIVIDED LOWER CRETACEOUS upper sandstone unit variable Vinckier Waage water-level data water-well drillers WELL—Number