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<br />Table 1.--Climatological datal from stations in and near the study area <br /> <br />[ft=foot; in.=inch; of=degrees Fahrenheit] <br /> <br />Station location Grand De lta Cedaredge Bonham <br /> Junction Reservoir2 <br />Altitude (ft) (sea level)------------ 4,670 4,930 6,244 9,835 <br />Mean annual precipitation (in. )------ 7.95 6.9 11.5 32.0 <br />Mean annual air temperature (oF)----- 52.5 50.1 49.0 <br />Mean annllal daily maximum air <br />temperature (OF)------------------- 65.1 67.1 62.9 <br />Mean daily maximum air temperature <br />for July (OF)---------------------- 93.5 92.6 87.7 <br />Mean daily minimum air temperature <br />for January (OF)___________________ 15.5 12.2 15.6 <br />Period of record--------------------- 1951-80 1950-79 1951-80 1964-78 <br /> <br />lBased on data from the National Climatic Data Center for indicated <br />period of record. <br />2Bonham Reservoir is about 4 miles north of Eggleston Lake, which is <br />north of the study area. <br /> <br />Rock units in the study area range from Precambrian basement rocks ex- <br />posed in the Uncompahgre uplift to Quaternary alluvium in the valleys. Most <br />common rock types are sandstone, shale, alluvial sand, and gravel, with <br />igneous rock capping the top of Grand Mesa. Age, thickness, and lithology of <br />the local rock units are summarized in the stratigraphic column (table 2). A <br />hydrogeologic map of the study area with areal extent of exposed rock units is <br />shown on plate 2. <br /> <br />6 <br />