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<br />. <br /> <br />. <br /> <br />. <br /> <br />2B41- <br /> <br />The major factors controlling the occurrence and <br /> <br />movement of ground water are the climate and the <br /> <br />lithologic, structural, and erosional fcat-.In~s of the <br /> <br />rocks. <br /> <br />The principal occurrence of (JLound water is the <br /> <br />sandstone formations, although surficial deposits are <br /> <br />significant aquifers near the Ut~ Mountains. <br /> <br />Shale, <br /> <br />the dominant rock type, inhibits or precludes the movement <br /> <br />of (JLound water. <br /> <br />Thus, artesian conditions C!l"nerally <br /> <br />prevail in the sandstone beds confined by the shale. <br /> <br />Most or the wells yield water from artesian sand- <br /> <br />stO:1e aquifers. <br /> <br />The mLljor artesian aquifers are the <br /> <br />Dakota Sandstone, the Burro Canyon Formation, the Junction <br /> <br />Creek Sandstone, and the Entrada Sandstone. <br /> <br />As a part of tnis investigation, several stock 'dells <br /> <br />were drilled in the western part of the resE'rvation, and <br /> <br />three deep public-supply wells wer0 ~~illed at Towao,. <br /> <br />Stock wells tap,)ed the Dakota Sandstone; the deep wells <br /> <br />at 70'-oJaoc tapped the JUl"!ction Creek, Entrada, and N i:l'iajo <br /> <br />Sands tones. Pumping tests at Towaoc indicate that yields <br /> <br />of as much as 100 gallons per minute over long periods <br /> <br />are possible ":"Olm pumping the 3 wells. <br /> <br />/..~ <br />