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<br />small Ifuabl'ai sySll'lll west of III\' Kaihah uplift: and anolher
<br />larger SYSll'lll to Ihl' l'asl (fi~. ()). Thl' I1ualal'ai al'l'arl'lllly flowed
<br />soulhwl'sl or l'o~.';ihJy WI'SI. The olher Sy~II'1l1 ultilllalt'ly drained
<br />toward Ihl' east or SIHlllwasl. pt'rh;)i>~ nl'ar the j'rl'Sl'nt COlll'.'!: of
<br />the I.ittle ('olmado I\in'r. ('onlinllil1~ ul'liit .,outh oi the soutlwrn
<br />bonll.r of tilt' ('olor;ttl" 1'lall';1lI in a pO,;ilin' (Ul'lhnISlt'd) a 1'1':1
<br />call1.d lilt' :\11J!..:oll"n Ili!..:hJ:lIld" (Ilar.,hbarger /'I al.. (1)57) and
<br />{'cnlral ,\rizona .\Iounlailh (:\ld~l'l' 1'/ al., I t)()7) pro\'ided irom
<br />its northern e"pnsun',; e"ll'n~i\"(, gra\"els to Ihl' soutllt'rn plateau
<br />mar~in (:\lcKl'I', 11).:;1).
<br />('han~\'~ on Ill\' pl:llt':lll in 1'lion'lh' lilll\', (:\IrKl'e // .al., 1<)()7),
<br />or lH'rhap, ill lilt' .\Iilll'l'nl' (( '\lolt,y. in :\IrKl'I', IW,,: ('ooley and
<br />:\kl'r.~, 1'1(, I: t 'o"lcy and I );I\'id.'"n. I l)(),,), eOlhisll':1 oi dl""l'ition
<br />of thl' 1'''II'n.;i\'(, I:idahochi FOrlllatioll (iig. I)) in Ihl' sOIlIIl\'astl'rn
<br />pan (R,'/,,'nnill!..: and lrll.in. I')':;~: Rl'pl'nnin,~ /'I1l/., [I)':;S), and
<br />of ill!I'.~rati"n oj lilt' I'a.,tl'l'll and 1\'l'sll'rn drainagl's oi Ihl' ('olorado
<br />I'bll'au inlo Ihl' Ihl'\lu!!h.il,,\\'in~ ('0101';1110 I~i\"l'r, '1'111' qUl'stion
<br />persisls as to lhl' course oi the Colorado Ri\"('r \\'I'St oi Ihe pbll'au.
<br />..It may han' ilowed 1I'1'.,I\\'ard, as indicaled hy (:"lensi\'l' f'lion'nl'
<br />siltstollt'~ \\'I'sl oi thl' :-;allon :-;l'a (\roodring. 19,,2: Rl'ed. )9.>3),
<br />and pl'rh;lp~ substantiall'd hy ii~h dislrihuli"ns (lIuhbs and :\Iilll'r,
<br />I')~S: :-;llIith 101)/;). or il m;l)" han. ilo\\'l'd .,oulhll'ard. in or lwar
<br />its pn'sl'nl cklllllt'l I Lucchitta, I (), 2 I, Thl'rl' i,; lill!!' doubt, h,)\\'-
<br />l'\'l'r. that lilt' rin'r iloll,'d Ihroll~h the area no\\' occupil.d by Lakl'
<br />:\Il'ad in !:itl' "Iiorl'n,' (:\lrKl'I' /'/ Il/., 1l)(,7 J, IWIII'('I'n IS and 10
<br />million )"(,;Ir~ a~o (Luerhilta. 1'1721, alld on 10 lilt' (;uli oi Cali-
<br />fornia (:\klz~l'I'. J'.)(,S).
<br />Thl' 1:lIllb iOrllling part oj thl' prest'll! (;ila Ri\l'r ~C!!ml'nt of
<br />lilt' 1'"lorad" Ri\'t'r I,a.-in. 'outh oi lilt' .\IIJ~fllloll lIi.~hbnd.;, \\'l'n~
<br />drainl'd I,y "'lllthlll'.'II'r1.I'-jlml.in!! Sln';II11., in 1'0,;I-Laramidl' limes.
<br />TIlt' \lo,~oll"ll I Ii~hl:lntl., l\'l'rl' cflnlillllOll'; Wilh a lalH I 111 a,;". in what
<br />I., no\\' ,;outl1l'1'I1 :\1'\':111:1 and l'a"tern {'aliiornia (ii.~. ()), forming
<br />during Illllrh oi tilt' l't'nllzoie a di\'idt' bl"lll'l'l'n Ihl' ('ol"r;tdo I'la-
<br />It'all and Ihl' B;hin ;lIId '1{:1I1~I' 1'l'\l\'inCl' (Cooley and I ):t\,jd~on.
<br />)l)(),l ). Soullllrl'stl'r1y dr:tin;I~I' Ihrough thl' hi.~hlands, irolll the
<br />('d~l' of Ihl' upliju'd pl;1 It-;tll , \l"a~ disrupt I'd in the :\/ion'nl' by ad-
<br />dition;" upliil of III\' hi~hland., as a unit (Lancl', Il)(,O). (;or.~l'S
<br />wl'r(' CUI in \hl' risin~ mountain.';, and draina.~l'S dl'\"l'loped trans-
<br />versI' 10 Ihe sUflt'rilllPos{'d SYSII'IllS along ZO/1<'-, of w{'akness, or
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