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<br />drainJ.ge of the }:orth Fork rJ1U1Y"l"Ls:--,n Riv"0r lies hi,,:h i~l tho '.:~untQin
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<br />rcne:cs c.t tho o2.stcm cxtrc'~i..t:r ::.f t::-:: ix',sin and ~::.t ,~:J.C\r.:!.ti:Jn3 v[1.ryine
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<br />frQ~ 9,000 to 13, aoo foot ab::..vC' sec. IGvc:l. C::-:nprisinz tho hC:J.d1':cters
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<br />arc e.~.lcst nW";1bc.:rl,: 58 tritu t::.r~.0S, ly"5.n-::; in ~ fan-shGpcd .].1'C3. -.;:hich
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<br />c-::'nvcrgcs nC8.r t1;o t.:J\-m \Jf P,:.cllia, C'JJ.0ro.d.c:. 1"r:J:-.1 t~lis P':""]_Ilt the
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<br />}.~c;rth :P':rk 110\,[s to tl"'.8 SOl1 th~'{l;s t. for 2. (i.istance 0i' c~r.pro_ti:.~~tclj~ 15
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<br />:Liles to its CJrlUUCnco T:ith t~:.e :13.in G1..Ulnis'.::~ ~ivcr 2b-:.ti..t f:JUT' !,jj_les
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<br />V/cst e,f 1,o.z8a1', Co10rado. .i..fter j':Jinins the ~.1~in Gunnis-:.:n aivc:r,
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<br />w~t8rs :::1' the NDrth F'.lrl( fl,y,,; T::cst~"ls.rcl f.)r :j::-:.-::~~ 15 ,~ilC:3 to the to','.11
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<br />..:)1 n,:'l-c.~,) C'jl:.'r:::6o l/hcl'c th8 o.'J-nr,isc;l .:md UlLC:".:.1:"')aher(;o rivers convereo.
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<br />[nch 01.' tr.':::: C\To...::2., 1,I,-j th '.,r.~ich tr.i::.; r,;n')rt i5 I~.:)nccrncd, is
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<br />cO:'.lpriscd ,,:':1' tribl tC::I7 3tr;.~~':, b,':"'.siLS 1,:hj,.ch lie :n thrj n'Jrth side (..,f
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<br />the P:Jrth Fcrk 2nd fl'~1ii .'~'..)UtlJ:N:lrd to ~!':ii1 t!!c.t ,str(~2.'":1 2hJVC the :,'.outh
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<br />uf t':;c ;-~ain Gu...'1.ni3Jn .:.:r '\.~.ich c::.pty intc tho '}unrd.s:)n belo'{[ the
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<br />.iuncturc of the :":":D.in river :lrl~l tl:J N:rth :?~'rk. The ~rinci'JD.l str02:":1S
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<br />of this S';roup 3re Lorf)ux Cr,:(.k, 2. triy,utary of the: H.::rth ~:)rk ~nd
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<br />Surf3.ce s.nd :f.'c-r1-:ccl Tcn.~,~ cr2c!,:s, b:itL tribllt~.r:/ t-=:, til':; G1.lIU1ison Riv13r.
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<br />These str,:.'::'!:'. systc~'~s t:::':;':Jth,jr '" ith nlElcr:JUS ot1:1crs h:J.ve th'3ir he.':~d-
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<br />y;a.tGrs cn C'rr.C'.nd r"csG., e hi~~ is.)l[~'ccd bc'.~jalt c8.r:~!cd .G'l.:~t\:.':,u, the up';Jcr
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<br />~ur lace i')l' \':l-"j ch lios ::,t 2f1 cl,::vc,.ticr!. ~):r 20 Ie 10,000 feet above sea
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<br />1evcl. Strc:c.-': e:r2.dicnts 21'8 hiJ:11 2cS ::~~'idenccd b~{ the ff:lct thc.'.t the
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<br />c1.ifi'crcnce in e10v~ti8n b0t1".'8en GI'and ~t;cs;:~ and th(;, \r:.ll(;~lS of the
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<br />1'-:',)rth ?or~{. 2nd 'Junnisc~n is i..CJre thar. 5,000 f(;ct. The :-'.axiT]lt:~ tribu-
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<br />t2r~! strcr:_'~ l;:-.ngth is 5J.i~htl:y -,::.1'c th:::.n 20 piles.
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<br />The 2rC.a l:.rin~~ bcb'!C8~1 t;:..e: GurrnisJn valley cmd Gr2.nd f~CSD. is
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<br />traversed by ~~GvGr.11 tribu tar;,- str,~:),-~s <:mQ is chnr.2.ct8ri zod by a
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