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<br />2878 <br /> <br />Wright, Shawe, and Lohman (1962, p. 2057) designated <br />member names for the Entrada in east-central utah and <br /> <br />. <br /> <br />west-central Colorado. The names Moab Member and Moab <br /> <br />Tongue are retained for the upper member; the Moab is called <br /> <br /> <br />a member in and east of Arches National Monument and is <br /> <br />called a tongue west of tllis point (Lohman, in press). The <br /> <br /> <br />middle unit is named the Slick Rock Member, and the lower <br /> <br /> <br />unit, the Dewey Bridge Member. The upper sandy member and <br /> <br /> <br />the medial silty member of this report and that of <br /> <br /> <br />Harshbarger, Repenning, and Irwin (1957) are correlative <br /> <br /> <br />with the Slick Rock Member and Dewey Bridge Member, <br /> <br /> <br />respectively. <br /> <br /> <br />Water supply.--The upper sandstone member of the <br /> <br /> <br />Entrada Sandstone will yield small (less than 10 gpm) <br /> <br />. <br /> <br />amounts of water to wells. The water-bearing properties <br /> <br /> <br />of this unit are not great because of their fine-grained <br /> <br /> <br />character. Development of supplies from the zone should <br /> <br /> <br />be attempted in places where supplies are needed in <br /> <br /> <br />addition to those obtainable from the overlying Dakota <br /> <br />and Junction Creek Sandstones. <br />The medial silty member of the Entrada is relatively <br /> <br /> <br />impermeable and acts as a confining bed. Where the <br /> <br /> <br />medial silty member is not present, the upper sandy <br /> <br /> <br />member rests on the Navajo Sandstone, or older rocks <br /> <br /> <br />where the Navajo has pinched out. Here, the upper sand- <br /> <br /> <br />stone member and the Navajo will act as one aquifer. <br /> <br />. <br /> <br />41 <br />