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':~-~ <br /> <br />:,n{:5 <br /> <br />.>< <br /> <br />Geohydro- <br />logic. <br />=" <br />1 <br /> <br />Geohydrolo~1c unite in the Upper <br />Oominant Approximate area <br />eal1nity Percent <br />of natural Square of upper <br />runoff miles beein. <br />Nonsll11ne 11,500 11 <br /><250 mg/l <br /> <br />~~~ <br />~~~ <br /> <br />~ ,,',:5'::"~',,< <br />>~:i/ <br />~,: .-,. :.~-~.,~ <br />'<:2,;~:{~~~ <br /> <br />~)! <br /> <br />{... ::.<>'~ <br /> <br />~~~tk <br /> <br />.... ..'<: <br />~<'.:~,~:';~-:'-} <br /> <br />~~~t:~~~~.' <br />~: <br /> <br />~:::-..;,{"~; <br /> <br />2 <br /> <br />Nonssline to <br />slightly Baline <br />251-1,000 mg/l <br /> <br />45,200 <br /> <br />3 <br /> <br />~~: <br /> <br />Slightly saline <br />to mod~etely <br />ssl1ne...= 1,001- <br />2,000 IIlSl1 <br /> <br />31,BOO <br /> <br />Moderately' <br />saline..Y to <br />highly "aline <br />>2 ,000 ~/l <br />Nonealine.: to <br />highly saline <br />(nonsaline to <br />slightly saline <br />in most places) <br /> <br />, <br /> <br />19.800 <br /> <br />5 <br /> <br />1,200 <br /> <br />~i1J(:'\ <br /> <br />" <br /> <br />L~i" <br /> <br />'.~.:..j ;~ <br />~VFtf';! <br />-?;,,:: ;.... <br /> <br />2f60 <br /> <br />F>.... <br />~..,: ': <br /> <br />"" <br /> <br /> <br />;. ::~:;<~,: <br /> <br />", <br /> <br />.... <br /> <br />. ~;~~\ ~.~- <br /> <br />~. ^.... ~'-' <br /> <br />':.,.. ,. <br />-;' ~'~".,-<: <. <br /> <br />. ' \:(J,;;J::);;;:,;:;f:i?: <br /> <br />Table F <br />Colorado River Basin Rnd dominant salinity of natural runoff from those units <br /> <br />" <br /> <br />Dominant rock type8 <br />Plutonic and lIletaJOorphic rocks of Precam <br />briar. a~e and ip;neous rocks of Tertiary <br />and Quaternary age; include granite, <br />lava flowa and related igneou8 rockB, <br />Quartzite, Rneiss. and schiBt <br />Sedimentary rocks of marine and continen- <br />tal origin; include limeatone, dolomite, <br />sandBtone, and quartzite of "61eozoic <br />sge. sandstone of Mesozoic age, and some <br />siltetone, limestone, shale, and con- <br />glomerate of "eeozoic and early Cenozoic <br />.ge <br /> <br />Sedimentary rock6 of predominantly contin- <br />ental origin; include mostly interbedded <br />sandstone, siltstone, mudstone, and shale <br />with local strata of conglomerate snd <br />limestone mostly of Cenozoic and late <br />~e80zoic age; contain considerable csr- <br />bonaceous material and evaporite deposits <br />Predominantly m.erine scdlm.entary rocke of <br />~esozoic age; include mostly shale with <br />some sand9tone, limestone, msrletone, <br />mudstone, conRlomerate, and RYPBUm <br />Unconaolidated deposits on Quaternary <br />age: include ~lscialJ alluvial, col- <br />luvial. and windblown deposits: clay, <br />sand, and gravel along most stre8D1S and <br />in glaciated mountain areRS, most Iv sand <br />and silt in other areas <br />11 I"odifjec! frOM Iorns, lIeTT1!]ree, and f'\al,.land (1':165, ta't>le 1). <br />'I r.enerallv yf.eld nonssl1ne t.o sli~htly sal "lne "later '{here elt'.'o8e~ in I,f_.~h, ....ell-'~etted /'Ireas (~ee text). <br />11 Glaciofluvial deposits and alluviuJ'l alonp: lar"'er !"lain-ete!'! stre-'\.'1\fI yielc! nonBal1ne '~ater: colluv:lum anr\ <br />units 2 to 4 (exposure9 too small to be Bhown in fi~rp 7 ) generallY are cO!'lposcd of the S~l"le roc~ !'late rial anc! <br />88 do the. re8pective unit8 which they overlie. . <br /> <br />29 <br /> <br />18 <br /> <br />Repre6entative ~eolo~lc formation~V <br />~ront Pan~e r.ranite Group (of former usa~e), Needle <br />Mountains Group (of former usage), Uinta lo4ounraln <br />Group, r.unnlson Qiver ~erles (of former usap:e), un- <br />naIlled igni!oUS rocks <br /> <br />Brazer Limestone, Hadiaon Limestone, Leadville Lime- <br />'gtone, Jefferson Limestone, Ouray Limestone, ~organ <br />Formation, ~eber Sandstone and Quartzite. Oquirrh <br />Formation, Hermosa ~ormatlon, Tensleep Sandstone, <br />Phosphoria ~or!T1ation, Cutler ~ormatlon, Park Ci~y <br />Fo~atioD, ~ico ~ormation, Glen Canyon Group, <br />Summerville Formation, Entrada ~andstone, Curtis <br />Formation, Horrison Formation, Dakota Sandstone, <br />Cedar ,",ountain Fonn.ation, Mesa lIerde Group (locslly), <br />North Horn Pormation, and Flap;staff l.imestone <br />~asatch Formation, r.reen River Formation, Uinta <br />Formation, Fort Union ~onnation, Bridger Formation, <br />Duchesne Qlver ~orm8tlon. Browns Park Pormation, "'id- <br />dIe Park Formation, S6n Jose ~omatlon, Nacimiento <br />Formation, and M~sa Verde Group (locally) <br /> <br />,",oenkopi Formation, Ch.illle Formation, Mancos Shale, <br />Tropic 5~ale, Lewis Shale, Baltter Shale. Cody Shale. <br />~teele ~hale, Kirtland ~h8le, Menefee Pormation, "'ess <br />Verde Croup (locally), and Straip;ht Cliffs Sandstone <br />Quran~o Till, ~lorid8 Gravel, Cerro Till (of former us- <br />age), and many mapped but unnamed unconsolidated <br />dep09its <br /> <br />'~~.ntjblo<ro i1eposita in ~eohydrolop:'.c <br />yield ~pter in the 9~me sslinity rBnp;e <br /> <br />113 <br />