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_7_ <br />4. Groundwater <br />To date, little detailed information is available about groundwater in the <br />groundwater resources in the White River drainage basin upstream from Meeker. <br />The best general information on groundwater conditions is contained in a <br />reconnaissance report recently puhlished by Price and Arnow (1974). <br />r a. Geology. The complex hydrologic properties of rocks and geology are <br />the principal factors controlling the quantity, quality, and availability of <br />groundwater in the area. According to Tweto (1976), Cretaceous rocks comprise <br />virtually all of the Curtis Creek watershed. Characteristics of these rocks <br />study area. Only in a few scattered areas have detailed studies been made, and <br />few of these contain enough quantitative data to make an adequate assessment of <br />as described by Tweto (1976) are summarized below: <br />Iles Formation - Sandstone and shale. Trout Creek Sandstone <br />Member at top; coal beds in upper half. <br />Mancos Shale - Intertongues complexly with units of over- <br />lying Mesaverde Group or Formation; lower part consists <br />of a calcareous Niobrara equivalent and Frontier Sandstone <br />and Mowry Shale Members. <br />Williams Fork Formation - Sandstone, shale, and major coal beds. <br />b. Occurrence and Quality of Groundwater. primary recharge areas are <br />those which receive the largest amounts of precipitation. These are also the <br />major surface water source areas. Groundwater discharge areas include springs, <br />and the lowed reaches of perennial streams. The Curtis Creek watershed is an <br />important, but relatively minor recharge area. <br />• <br />