<br />.~, :.:/,>;" ,;', '~-Z::~l~.,~.. ~/. "n ~.. ,'" . .<:-':.....,:.:'; "",
<br />~. _ ,',>'1":""''','.:..'-;'' : - :. ''''~ .... . _'.__,~ ;;.';:.,
<br />~ ::,';: ;~2~ :'~~~~;:,~,:;'::"c,'< _ -,' ,,:':':', ,"" ~',~' ': :,.',,!/y((::?~~;,
<br />-..r~~_ ~~'<-~.,;. >"'__~..,.~'-~~~/"~"":' "." _',',,! "'~','_,,'.
<br />
<br />
<br />~ ~
<br />
<br />.',;"
<br />
<br />: ~ .:-::.::'::
<br />.:: .,"':"....,~.'
<br />~~~~.: ,>.,; ~,"";
<br />:~..,>:. ':~-~
<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 />
|