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J~ 0'/ {.J /,( /' . ~ . . cf; (j;;\ ; /'oJ Jmb [/'" Y ~;;...?-:~''/ IrF'\.-//, Jm /' -<--'//) , I' W' II/"'" rr Jmb ) :(,V}?r (\: '1 /1 Kdb )Yl~;././ ,/ ou //~7....J~~wce..9-""'" .'7IiU)l"~-""-V )JmsA. -/~ Jmb-,l '--1:,-""""'" " /(~f ~h 1'Lt- \\, < ~\/IIV dJ \~\ ]:'~msf/J/K~ou~~~~._~J~:S}~~~a~}~rffM:~/'''~~''V/J(;/ ~J-(;;'V'''A'fi~~ /"",,~~~~~ _I ) \'m_- '. Jms ~..l o. Il'~rb~~ t1' ~~,@ <c!J/l~ ~fjfflY /)/ "'..1 '/,/'/ ~.. ~ ~I(I 1~ ~ / ' \ ~ o-:~('\ -H ~" ~ . ~ ~-" ~ Kdb...._ -sc- -:Tmb .1.' 50~ .--'~ '-, -7~ . /' rY' 2 ~~l ( Ii "" -~, I <~.\-.-/' - 1 R.9 W. Geology modified from Tweto, Moench, JmD~/ ~ I (\ -t. ~~ Je 0 J .J..\ ~ .I / ' ~.. fl r;// 1 ';), Jmb?l ,<:' t Kdb \ \. . and Reed, Jr,I976, Williams. 1%4, and T.50N. :\-\-/k~'-,.. kJ~1 /: J b'~~ e"'lm'/ Jms'- V(Nn; b ESA .' ;./ '/'i-}m~ :'i~ . b / . ....,?-../.T.50N. Tweto, Steven, Hail,and Moench,1976 .) ~,,: ))r='- ~r m 1 ,.d ~ ~ ;J :t )'/' II} I Kdb: ~ i/, //// . t-Je rll./R.l1 w. (J~~ _I.J~ ~ .&'Jms~ Kdb rr61 i"'Jm) 1 Jmb' ~). / ~e), J. ,)/ :'.".1.,.. 'If )'9f'/" {db) ,jf'RWC \. OJms . Je a :) /i . 7. Kdb ~/ ,/;. VV/ ~ f) , J 8 ~1f1 fj..j ~;(S -0- Kdb RWCrwe rf ~~ Je'WJ??!/ I I), .', J /J ~ ,r ~ ~J ~ Z;Y~ ~/I Jmb . 1.\ . ;~1Kdb /~~_J M ~- ~;J:;;""-l;t Je))tr / I~ ~Jj".ff /~~Ar( .1/ .J/r- 0>~!J .-' R. 16 W. (Jm)' -:: _ . '/...~Jmb . ~. .' Je W r / ?-':/ ,:..5 lJmb r;. It J' Jms ~ ~ / Iff,.J1 f/ / Jmb pjK/ tP. ,/~ r-, \ ~/\/' ~ .:fJm~ ~ ,Jf'"~\( ~ ~/~~ Jml ffJI/:r' _. ..f2l.. ,,;~/I_/ljrr;//t 1/./ ~ Kdb .~/~~ (lfflj~C .}.1;1J~ Kdb /p.,. t Jmb T K::~Yf6~e ~b '\ ~\~~s~ ~ AJ7/.JJ / \ Vj~ 0/>/;- d3 m % : l I {lKdb .' Kdb J:b'l ,';A ~mb ~ /7, Jmb Jms $'1/ A ~ RC \ ,- .:;)-:;. ..--1." ../ MOtolJ E c~ . '_I. Kdb ' ~I ':ftJ/ '~ I) ) ~mb ~}-.. Kd~"'r-~EST':d~.~. /^~ Y! If:' ~. ~., Jm/", II I, Je. :~~/"/j.j";f:Z L- - Kdb ../ j)'/{/j'1/' '7)\ / ;,~: ; V .~'t'^' /~ ,])/""lV ~~~.e\\ \\ ~h ~30:'\ ,/'. i/ 1/ I-Jm fl / (/:// 11Jmb .. /J;f'.. ~ '{mh t;:?\... '1" ,\ \ ': Jmy 'I ( 1 :::/_ /' v A .-Jmb / I") \\\ .t-"-~ Ii Jmy '\: Kdb I If Kdb /' (iI.v ~ 'f-...,~ At.. J\. V' '"\I I. / / . ,Q,Qj /. "i/ (~~~ "Ml.. \ ) IIJlSmb I" ./~,/ .<"/ j ,. ~\\ / Jmb) .. :f. /.. i,u'l;\..( . ,j, .............1 J.. .~. -!i:>,,/' // :....ei,.7<P.J~'n~ j- Jms 9205 -- Jmb'f".'..'/ '/ ~~\.I~mb r R.14~, ----..../ 1/1;:(" :~"I:::('Kdb';Y"I1;.:e '1/11 I Co/lJmbne :'. . . /.... .J T.48N.E'.Q~s .: .1, ' . - f/ / //.....jnbJ~ Jmif/T.48N. Kdb ..' ,/./ m~r~Jm V '9510/' /:,j-j-:'...)c J/I /(;,......~~^~ ~. KmA I'Jmb \ ~\ ~ //M ~,' '"")~ )~rlll: I l~ \ Kd;8f~bl T.47N\ ~'Ir- /1)T.47N. , I '/Km II . ~01 UNITED STATES DEPARTMENT OF THE INTERIOR GEOLOGICAL SURVEY 002120 Prepared in cooperation with the COLORADO DEPARTMENT OF NATURAL RESOURCES DIVISION OF WATER RESOURCES . au..&.L.. I ]111... ..,'''......, ..........._Ill!! 1111' '1IIlll'JUllIl.U t1~O( D WATER-RESOURCES INVESTIGATIONS REPORT 84-4185 PLA TE 2 DESCRIPTION OF HYDROGEOLOGIC CHARACTERISTICS UNCONSOLIDATED QUA TERNARY DEPOSITS-Reported well yields as much as 750 gallons per minute. Gravels and alluvium are the more significant aquifers and commonly are sources for springs. These are important aquifers In the lower Gunnison River basin with ;pecific'con~ ductance values for well water averaging about 1.750 microsiemens per centimeter at 250 Celsius and for most springs less than 500 microsiernens per centimeter at 250 Celsius. Most water from wells and springs is a calcium bicarbonate or calcium sulfate type Oa Alluvium Og Gravel CORRELATION OF HYDROGEOLOGIC MAP UNITS Q/ Landslide deposits and talus Cd Glacial drift I : I Q/ I } QUATERNARY } Holocene Qd [ } Pleistocene R. 15 W. Base from U.s. Geological Swvey 1:250 000 Grand Junction, Moab, Montrose, 1956 and Leadville, 1957 Unconformity I Tb I BASALT-May be an aquifer In outcrop' areas. Broken rock yields 6 to 25 U I gallons per minute ncon annity I Tu I UINTA FORMATION-No infonmation available. Not an aquifer in the study area I Tg I GREEN RIVER FORMATION-Data available for only two wells; one well yields less than 1 gallon per minute; specific-conductance values from two samples averaged about 310 microsiemens per centimeter at 250 Celsius I Tw I WASATCH FORMATION-No infonmation available. Not an aquifer in the study area ~ MESAVERDE FORMATION-Yields sufficient water for domestic wells with an average of about 10 gallons per minute. Secondary permeability in fractured coal and sandstone beds increase transmissivities. Reported transmisslvities range from 031 feet squared per day for unfractured rock to 400 feet squared per day for fractmed rock within the study area and east, above Paonia. Specific-conductance values averaged about 1.250 microsiemens per centimeter at 250 Celsius. Ground water Is a sodium bicarbonate type ~ Rollins Sandstone Member-No information available. May be permeable enough to conduct water but steep outcrops provide little recharge opportunity ~ MANCOS SHALE-Variable well yields reported from I to 20 gallons per minute. Early wells were drilled Into the formation because of the convenient locations although no new wells are being developed in this formation. Specific-conductance values in surrounding areas indicate generally unacceptable water for inigation or domestic use Unconfonmlty G } Pliocene - Unconformity - Tu TERTIARY Tg Eocene Tw - _ Paleocene Kmv KmvrJ CRETACEOUS Upper Cretaceous Km - Kdb Lower Cretaceous ~ R.13 W. Unconfonmlty Jm ,= } -'"'.., l""= Jmb Jmwe Je Unconformity Rk } "-""" }~~ RW RWC RC Unconformity o } PRECAMBRIAN R.12 W. '- 2 SCALE 1:125000 2 4 8 MILES , o 6 2 0 - - 2 4 6 8 KILOMETERS , HYDROGEOLOGIC MAP OF THE LOWER GUNNISON RIVER BASIN, SOUTHWESTERN COLORADO ~ DAKOTA SANDSTONE AND BURRO CANYON FORMATION-Wells have consistent yields between 5 and 14 gallons per minute. Valley wells have been drilled through the overlying Mancos Shale and into the Dakota Sandstone. Water is a sodium bicarbonate type with specific-con- ductance values normally less than 2,000 microsiemens per centimeter at 250 Celsius. Springs are a sodium chloride sulfate type, with most specific.conductance values less than 500 microsiemens per centimeter at 250 CelSius Unconformity I Jm I MORRISON FORMATION-Data for only one well that yields 9 gallons per minute. Specific conductance was 1,490 microsiemens per centimeter at 250 CelSius; and water is a sodium bicarbonate type. This unit is com ~ posed of the Brushy Basin and Salt Wash Members on the geologic section. Spring specific-conductance values averaged about 470 micro. siemens per centimeter at 250Celsius and water is a sodium bicarbonate type Jmb Brushy Basin Member Jms Salt Wash Member Jmwe MORRISON FORMATION, WANAKAH FORMATION, AND ENTRADA SANDSTONE-No infonmation available ~ ENTRADA SANDSTONE-Two wells yield 11 and 14 gallons per minute. SpeciFic-conductance values were 531 and 731 microsiemens per centimeter at 250 Celsius. General water type is sodium bicarbonate Unconformity IRk I KA YENT A FORMATION-Data includes only one spring with specific con, ductance of 303 microsiemens per centimeters at 250 Celsius and discharge of 0.5 gallon per minute I RWC I WINGATE SANDSTONE AND CHINLE FORMATION-No infonmation available ~ WINGATE FORMATION-Data for only two wells with yields of 11 and IS gallons per minute. Springs are a magnesium sodium bicarbonate type, with an average specific conductance of about 330 microsiemens per centimeter at 250 Celsius ~ CHINLE FORMATION-No infonmatlon available. Not considered an aquifer U f. in the study area ncon ormlty ~ PRECAMBRIAN-No infonmation available CONTACT T FAULT-Bar and ball on downthrown side --t- SYNCUNE-Showing trace of trough plane and direction of plunge A-A' TRACE OF GEOLOGIC SECTION -Section shown on figure 3