[en] Surface reconnaissance and detailed subsurface studies were done within the Pratt Quadrangle, Kansas, to evaluate uranium favorability using National Uranium Resource Evaluation criteria. These studies were designed in part to follow up previous airborne radiometric, hydrogeochemical, and stream-sediment surveys. More than 8100 well records were examined in the subsurface phase of this study. Results of these investigations indicate no environments favorable for uranium deposits within the Pratt Quadrangle. Environments considered unfavorable for uranium deposits are limestone and dolomite environments, marine black shale environments, evaporative precipitate environments, and fluvial sandstone environments. Environments considered unevaluated because of insufficient data (although some thin sections were available for study) include Precambrian plutonic, metamorphic, and sedimentary rocks