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<br />Table J. --SUJZD8rg of the geologie formations and groups in the Upper Colorado River Basin <br />and their phgsical, hydrologic, and chemical characteristics--Continued <br /> <br />~9~J <br /> <br /> FOl1latioD Hydro- <br />Era- System Series and geo- Physical characteristics Hydrologic characteristics Chemical characteristics <br />t.he.m lo~,ic <br /> group unit! <br /> The Hesaverde Group in most The f1esaverde Group is one of the The dissolv~d-solids concentra- <br /> J places is about 1,500 to more productive aquifers in the tion of the ground water <br /> I 5;000 fee.t thick and under- basin. The fractured sandstone, ~ange& f~om ebout 300 to <br /> Hesaverde I lies the Wasatch formation or and in GOlDe cases the coals, act 2,500 mg/L but is normally <br /> ! <Il Group I fort Union Formation and over- as aquifers. Hany wells tapping less than 1,000 mg/L. <br />u " <br />H 0 (Williams lies the HaDCOS Shale. In the Hesaverde yield 200 to 300 <br />0 , '" <br />N i u Upper Fork aDd some areas the Hesaverde is galloD5 per minute, and yif."lds <br />0 < <br /><Il I .... Creta- Iles 6 overlain by the Lance Forma- of 600 to l~OOO gallons per min- <br />!i! ~ ceous Formation) tion and by the Lewis Shale, ute are possible for favorably- <br /> u <br /> , ! ~hich may be as much as 2.000 located 'Wells. Recharge occurs <br /> I i feet thick. The Mesaverde for infiltration of precipitation <br /> I Group consists of interbedded and snoWlllelt in the outcrop areas. <br /> lIlarine sbale, sandstone, and Discharge is to streams and also <br /> I coal. may occur upward to the Wasatch <br /> Formation. <br /> <br />....J <br />