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<br />28&'7 <br /> <br />System <br /> <br />I ~ <br /> <br />Quaternary <br /> <br />series <br /> <br />- - - - - - - <br /> Tertiary I <br /> I <br />- - - - - - - .. <br /> <br />Cretaceous <br /> <br />,. <br /> <br />Upper. <br />Cretaceous <br /> <br />Group <br /> <br />Mesaverde <br />Group <br /> <br />Table 2.--Generalized section of the qeoloqic formations in tne Ute Mountains Indian Reservation <br /> <br />Formation 1 <br /> <br />Alluvium <br /> <br />Talus <br />deposits <br /> <br />Pediment <br />deposits <br /> <br />'-- <br /> <br />Igneous <br />rocks <br /> <br />: Und2f f eren.-- <br />tiated Upper <br />Cretaceous <br /> <br />deposJ.ts <br /> <br />Kirtland <br />Shale <br /> <br />Fruitland <br />Formation <br /> <br />. pictured <br />Cliffs <br />Sandstone <br /> <br />Lewis <br />shale <br /> <br />Cliff House <br />Sandstone <br /> <br />Menefee <br />Formation <br /> <br />Point <br />Lookout <br /> <br />Member <br /> <br />Thickness 1 <br />(feet) <br /> <br />0-80 <br /> <br />1-40 <br /> <br />0-40 <br /> <br />1,160 <br /> <br />250 <br /> <br />230-290 <br /> <br />735-1,- 400 <br /> <br />400:l: <br /> <br />500-800 <br /> <br />300-450 <br /> <br />physical character <br /> <br />Water supply <br /> <br />Clay, silt, sand, pebbles, and cobbles. The <br />pebbles and cobbles are igneous fragments <br />derived from the intrusive rocks of the <br />Ute Mountains. These deposits occur along <br />major tributaries and include a few low <br />terrace deposits. <br /> <br />Yields small (usually less than I <br />amounts of water to wells, <br /> <br />predominately igneous pebbles, cobbles, and <br />boulders. contains some large porphyry <br />blocks up to 10 feet in diameter. <br /> <br />Yields small to large (100 gpm) <br />quantities of water to springs <br />the base of these deposits, <br /> <br />predominately pebbles, cobbles, and <br />boulders of igneous origin. In many <br />places the unit is mantled with several <br />feet o~ windblown silt and very fine sand, <br /> <br />Yields little or no water to well <br /> <br />Laccoliths, silts, dikes, and stocks <br />intruded into sedimentary rocks forming <br />the Ute Mountains. Series of porphyries <br />ranging from microgabbro through quartz, <br />monzonites. <br /> <br />Yields no water to wells. <br /> <br />Grayish-brown shale interbedded with soft <br />yellowish-gray sandstone. <br /> <br />Do, <br /> <br />~ <br /> <br />. .....r:-::-. ____.____~_... <br />011ve-9~Y and yellowtsh-gray shale and <br />yellowish-gray and fine- to coarse- <br />grained sandstone. Lenses of sandstone <br />(Farmington Sandstone Member) 330 feet <br />thick in the middle of the formation. <br />Local thin coal beds near the bas. <br />- -----._.......------~ <br /> <br />.. <br /> <br />H <br /> <br />1 <br /> <br />Sandstone units may yield very s <br />quantities of water to stock w <br /> <br />shale, brownish-gray sandstone, and coal. <br /> <br />Yields little or no water to wel <br /> <br />Light-yellow to light-gray very fine- to fine- <br />grained sandstone interbedded with gray <br />shale. <br /> <br />Dark-gray to greenish-gray shale and Bome <br />fine-grained sandston~. Contains thin <br />yellow concretionary layers. <br /> <br />Yellowish-orange massive cliff-forming fine- <br />grlll1ned ;r--' ~ sandstone and some ahaly <br />sa'ndstone beds. <br /> <br />May yield small quantities of wat <br />stock wells. <br /> <br />Yields no water to wells. <br /> <br />May yield small quantities of wat <br />stock and domestic wells. <br /> <br />Gray .to grayish-orange fine. -.to medium- <br />grained crossbedded sandstone and gray <br />to black carbonaceous shale and coal beds. <br /> <br />Yellowish-orange to white massive cliff- <br />forming fine-grained s.andstone. Lower <br />parts contain interbedded thin sandstone <br /> <br />Sandstone may yield very small qu <br />of water to stock wells. <br /> <br />May yield small quantities of wat, <br />stock wells, where the formation <br />..:I~__ .! u _ _'1 <br />