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<br />n-?l n <br />'J J -' .... <br /> <br />CONTENTS <br /> <br />Glossary----------------------------------------------------------------- <br />Abstract----------------------------------------------------------------- <br />lntroduction------------------------------------------------------------- <br />Purpose and scope--------------------------------------------------- <br />Approach------------------------------------------------------------ <br />Previous investigations--------------------------------------------- <br />Acknowledgments----------------------------------------------------- <br />Study-area description--------------------------------------------------- <br />Geography----------------------------------------------------------- <br />Physiography and drainage-------------------------------------- <br />Climate-------------------------------------------------------- <br />Geology------------------------------------------------------------- <br />Ground water------------------------------------------------------------- <br />Bedrock aquifers---------------------------------------------------- <br />Alluvial aquifers--------------------------------------------------- <br />Water-quality by aquifer-------------------------------------------- <br />Summary------------------------------------------------------------------ <br />References--------------------------------------------------------------- <br />Supplemental information------------------------------------------------- <br />Hydrogeologic data-------------------------------------------------- <br /> <br />ILLUSTRATIONS <br /> <br />[Plates are in pocket] <br /> <br />Plate 1. Map showing location of data-collection sites and other well <br />sites, lower Gunnison River basin, southwestern Colorado <br />2. Hydrogeologic map of the lower Gunnison River basin, <br />southwestern Colorado <br /> <br />Page <br />iv <br />1 <br />1 <br />1 <br />2 <br />2 <br />2 <br />4 <br />5 <br />5 <br /> <br />5 <br /> <br />5 <br />9 <br />9 <br />10 <br />11 <br />12 <br />12 <br />14 <br />15 <br /> <br />Page <br /> <br />Figure 1. Map showing location and status of Western Slope aquifer <br />studies in Colorado----------------------------------------- 3 <br />2. Diagram sbowing system of numbering well and spring sites in <br />Colorado---------------------------------------------------- 4 <br />3. Generalized geologic section---------------------------------- 7 <br /> <br />TABLES <br /> <br />Table 1. <br />2. <br /> <br />Climatological data from stations in and near the study area--- <br />Stratigraphic column, lower Gunnison River basin, southwestern <br />Colorado----------------------------------------------------- <br />Hydrogeologic data for wells----------------------------------- <br />Hydrogeologic data for springs--------------------------------- <br />Chemical analyses of water samples----------------------------- <br />Hydrogeologic data (noninventoried wells) from drillers' <br />records------------------------------------------------------ <br /> <br />3. <br />4. <br />5. <br />6. <br /> <br />iii <br /> <br />Page <br />6 <br /> <br />8 <br />15 <br />17 <br />20 <br /> <br />28 <br />