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<br />8 Sedimentology and Stratigraphy olthe Palisades. Lower Comanche, and Arroyo Grande.~reas of Ihe Colorado River <br /> <br />umh IhJI,,:ollld h,' d;jh:d h.' pr.:d:.tl1l tlu\ Ia] ;J(Il\ Il~. 1II ,Iddl- <br />lIOn to rll~lJ.lm ih'"J d"p'\~lh pr..:','nt at Ill\\l'r d,'\.IlllfO,1 h,' <br />prl'Jam Il'rral'': d.:rll'Il~ d':'l'rlh..:d ,'n rI\ l'r 1\'u al Pali..;tdl', <br />b~ Ikn:ford <lnll "lhl'r, I ]'N,~. I'NI>! mdll.k I fwm ,']d.:,t III <br />~,'ung,.,tJ: 11) -\llu\HJm ,)f PUl'hln-11 ;I!!,'lmap unit ';lp' l. a <br />uml 1 J III Ihld, Ihal \\ J~ mkrr.:d. ,'n Ihl' h,hl' "r Jr<.:h,I':u- <br />Illgl.::.tl anlfal'h, tl' ha\"';I prohahk ;I!!,' r;lIIg.: Illhdl'r.:\.D <br />9:'0 hl;\ D, 1O~.' I ~1I() c ~ 1 l pp..:r ll1e'<Juill' I..:rr;tn: I m;lp unll <br />'uml'). J lar,Ke-tlonllHlg \er~ Jin...I,' rin.... ';ll1J Imll.l' mudl <br />;I, ~ 11l1hi.:k Ihal ('olll;Ull' rnulllpk 1111\ "II dl'r'''lh \1 Ilhlll <br />II; radw<.:arhlln .Ig,', ;ll1d ar,'ha,'"log1"JI r"'1llillll, 'lIgge'Il'J <br />Jl'pl"Uinll III Ihh llllll 1ll'llll'l'n.\ D ] ~-l! l-t-II and -\ 11 <br />]x:<~~xJ.lhl'ugb analy,i, ,.f,lnfllll".d lo(all"n aIld .:IC\;lIIl'lI <br />lllJdl' lluring 1111~ '1Ud~ imph..., Ihallhl' I :-:~-t 110"d I 5,IJ..Hl!1l " <br />~ ]O.Ol!O 1'1' ..;. 1 "ppmg Jlld ,'Ibl'h. ~II031 al'pJr"ll1l~ n\\ <:r('J <br />ml"ll.flh("uml'ar(';1 UIL"v,('rllll"<JUll,'r...'rr;l(l'llllapull11 <br />'Iml'). tlu\ial ,('dllll...llh Illlhllllh... ...kLlll"n hUlll,.flh,' 1'1'::1 <br />tlo"J 1.J.I'l)ll In '. 1-II.Uoo It ,:I"pl'lllg ;md Hlher" '::O().'I <br />t'l;\~l'd ,mlbl' 1"(allll11 "I' drith\l",d 1in..:,: Ikrd','rJ (1'1<1.'1 <br />;llIflOlll.:d;ll1 ;(l,'''' "fA.1) I:>;.:-:-t I,' Ih.: ]'1.'\0, Illlhi, Ull11 14) <br />['rl'darn .111m illlTI I map unil 'pJa' I, ;111 ":\pI',"r... or' wdlln"'lll <br />I-~ Tlllhll'k J!lo\\<;'r .:Ie\all"lllh.ll1 '11111' hul J.h"\l'll,,' lll:-:i <br />11.1,,,1 ~al1IL h'ptlgr~pllII': p""lhltl 'llgg""I...J;1 J:l11' "I "';jrl~ <br />143(1, I" 11):'"7 ..\n addllh'IU] aUu\ la! pacbge. \\hl(h] kr- <br />.:f,lr,j (1')\).'1 11;l11ll'J Ihl' "'Iflp('d allll\ Illlll" Im;l[11111l1 ";J'I <br />Oil lhl' lla~I' III \t1ll'rheJdl11g "f allu\ lum \1 Ilh 1,'r~lll~ deri\ l'd <br />J),,\ rOnllJli,lf1 ,...diml'l1I. h pr"''''n\ 1111 ri\\.'r rlghlllllhl' "r....l <br />oulll01 \111 f1\\.'r 1...11 \Iha"'lhl' 'lud~ 1"OJ'l'd: Ihl' ,trlpl'J <br />~llIu\ IUIlI I~ Ih... 111.1""1 ,1l1d hlgh""h'k\ ~l1lOtl ;ilhlllJl IIl'P'''11 <br />r':(I'gniA'd 111 Ibl~ p.lrt of Ib..' rl\ l'r r,'rrllll'r 1),lll" "bl,lllll'd <br />fn,1l1 \.'\p,'~url" h...li('ll'd 1" hl' <':\'rrl'lall\,' IIi1h Ihl' ',a' unll <br />rang.:: frulll '::500 B I hl.\ J) .~O(l ('::5I>s 1,1 ~~:-;</ B ( III <br />uppl'r \larb]... (,ll1~"Il. I J'(-..tlIlllr ;ll1d ,'IJ1l'r,. I'N-t: 1,I,kr <br />Ih;1Il l.i(IO (l( .It (ir;lI1ill' r.lrL m...r tmk '::O'I.lkrdllrd ;l11d <br />olh...r~. .:(UH): :-:11(1 H.l hl \ f) .iO(llll t..''',l...m (,r;mJ (";lJl~ UI1. <br />Ikr.:fllrd.I'Il/.il <br />..\ brg.... f1h'r-h:hl'J ,1rrO~1l11l'I\\,'rk I "Ill' \\hP'l' PUlld. <lr <br />h;hl' k\ d. I' allh<: d",1 .llil'lI ,lllh... llI:lIn n\,'l .:h;lIln...lll1:1' <br />ITl(I,('J Ih...~... Jllu\ l;l] I,.rr.ll....~: Ih..: .Ig... ,lf Ihl' ;lrrl)~,' Inrl'l,m I, <br />unCl'nam. hUIll ;lpp...Jr, hl h;lh' hegun aft...r I '''(I. "ll 11l1..' h~I~I' <br />,If hhl,mCJI plwl,'gr:lph Jnal~ ,h h~ I kr...r.'rJ t !Wn 1 ]nl'l- <br />..;1Il11 h;l' do.'l'p"'lled ,ill('" I <J115. ,1udgl11g fr"lll ;laul pholl'gr,lph <br />l',,1l1P;lfi...lll 111...r.:\,lrJ. 1'I'J3, Ill'ref,'rd <llld ,nhl'r,. l'l'I-'1 <br />Phnh)graphl( "'\Iden(e JI'l'U"l'.1 b~ Thl'1111''''11 ;llld p,'l"l'hllll\ <br />I~OllOI ,ugg...,t, Ih;]1 in 1'1-3, a paMI;11 ;JIT\.I~" nCl\H'rl\ \I,h <br />prl"l'tlIlh;1I \1;1' h],,(k...d h~ thc 'pd;!' .d]ullut1l ;md :h~,'\.'1J!..'d <br />Jl'oli;1l1 dune, B~ ]'/'11. lh... ;lrr,,~ ,\ ,'hanlll'! hJd hrl';l(h~'d th(' <br />Junl'~ :md Jra1l1l'd Inh'lhe 11~1,'r;l,h, Ri'l'r I rbl'nlP"-lln .Ind <br />P"l<xhnik. ~lIll(IJ R"'Pl'.lll.J ,un...~ II ,'r!.. h~ P..:d..'r,,'n and <br />l1!h..:r~ I ~()lp 1 J",'u1l1l'nll'd lll(l'llllll,llhl' Jrr'-'~ ,I rda!l'J 1<1 <br />rr('~:ipllali()n """'11L' dllrln!; IIll' ~II()': 1111'11,,1"11 '(',I','n <br />:\...,'11;\11 dUlk' fl'nn, Jre pr("l'l11 IlI...r ;J \lIJ""l'r"'<lll ;lrl';( <br />ahlp Ihe llu\ IJlt...rra,....' d",,\.'nf:'.l'd b~ I krd"rd II <I')_~ I: IltJI <br />~tlld~ TllJrrl'd an arl';1 1'1 n'ppll'l' dun,. ,1\.....u11lul,1I1"1l' R('(<.'lll <br />aeli\l'dul1( IllI:,:r;\lllln I' .lpp:lrCll1 mlhl"- Jrl':L I\ilh mIlled <br />11l1lber and an hl,hlrl\.'-l'l.1 hor,(' ,!..ull h.l\ Ill!; h":l'n p.ml:dl~ <br /> <br />oun...d h~ .1,'ol1all dunn; mudl ,.1' thl' I;md ,urfal'l' Il>d;l~ i, <br />..:r;. pl"gami( :ll1d l'ul,'nl/l'd b~ gra"l". and 11 ;Jprcar, d.:tl;ucd <br />tll...rmu.::hoflhl.'\I\'111 !ng .if. <br />Thl' dU11l' tidd i, hordl'rcd allb ,'a..ll'fn IbnJ\\JrJ) <br />margin b~ pla~a J('rl"lh Ihal ..;hol\ l'\ Idl'n(( of Illl'J! ,~'dl- <br />In<:ni d...r1\ allon c reCl'l\ Illg ']'11'1.'_\1 ;hh from Ihl' rl.d Do\ <br />F,'ml;l1Il1Tl I1nllleJI:.ttel~ <lbo, 1.'1 <lnJ rl'(\;,T1l p"lldmg <ltlll Jl"l<':- <br />(:lllUll IIi!; -tl hI" dram;!g... JI\ 1.1(', Ml' l'\ Id...m \lllh1l11hc <br />pla~ J 1"1'" \to'l ,If 11' arl'a drJlIl' tlllll(' nOn II. ti.:...JlIlg Ihl' <br />1l1~11l1 arrl'~oll"'l\\"ll. .-\ 'l'e,.nd drail1;l;!l' ha~fI1l:"lk''''h \1 JI<:r <br />Ih~l1 l'\ <Jpor;I\.:' III a P'l11dlllg .lr':J \\,:,1 ,.1 Ill... 1l1all1 pla~ a <br />l'\P,Uh('. Itllnk'dl;lld~ ":;i'1 01 Ih... (kalll('r hlkllll! trail. '\llh IlO <br />llulkl10 the ri\...r...\ third. ,"ulhl'm Jr.lIl1:ll!(' 1l1'1\\ork bring, <br />nmofl l'rmn lhl' ...;hl.:m pla~a areJ tlllh<: ,mall arr,'~ n Jl'\ l'l- <br />op...J al Ihl' ('\Iren'" ,ollthl'm l'lld ,,1' lhe l'alhaJ(', arl'a. <br />Th.. rl\ er III tIn: I'JIi,;jdl" "r..:a h Hl .1/('11l' ,.1 I'l,,,\ C\P;II1- <br />'1"11 hell,,\ 1\1" Jl.hn, fall', 1\ hcrl' tl,,' n\ l'r ",,'rTIdllr Widen.. <br />1<1 morl' Ih.m 4(1U 111. III pan hl'eall'l' l,f Jr;llllagl' l,,'ntf<ll h~ <br />Ih... l'all.."J...., '('l!lll..:nl pf Ih... HUll,' Faull. :\ ~l'paralwn hilr and <br />rC;l1l.ll'hfTll'nl bar fuml III Ihl' 1"l1g, Jl;Jrr,l\\ l'dJ~ d,l\\thlrl'am <br />"rlhi~ r~lpiJ l(jr.11l1' ;md S(hlllidt. 1'1'191. \\llh a ~...(onJ 10\\- <br />cle\alil'l1 ',Ind h;lr ,,11l1"'llrnl'~ prl'~"'l1lthall~ ...pi,,,Jlrall~ <br />l'\p,,,..:d '\Ih;jl'fl<llI~ Ilig. .: I. [\Jllllllallllll "f gr,'ullll anJ ;ll'ri;d <br />I'h'}h'graplh b~ (ir;lnh and SdWllJt t l'llI'l) lia' ,hl'\\n thallhl' <br />,'\le!l1 "f ,lpel1 (11l1\ "'~l'lall'dl ,and arl';j 1m 111('~c "md h:Jr, h;h <br />!o'rl'<III~ Jl'l.'rl'J,ed rl'lall\,' hI Ih... prl.d;JlllC\fll"ur.... ReJue!ion <br />,or "1','11 "111.1 ;lre;!;l1 PJli';I,k~ h;h hl'en .111,' hOlh III a I\,,~ ,)f <br />hlgh-d.:\ Jll"n 'anJ II,rJnh anJ S,'hllllJ1. 19'1'1 I and III a ,uh- <br />,1;lnllalll1.:rl'a,... in l"l.ll'111/;lllllll b~ rip.man \eg...l;ll11'n ltigUfl' <br />..1-: "t TUrtll'l and Karphr:ll\. Ill~!I), Ik......11l ~un ('~ of J largl' <br /> <br /> <br />," ,,-"'"l!i,._ :...~ ,.a.: <br />~~ ....~...". ". <br />~... ........." <br />- , <br />. ~ <br />.; <br /> <br />;:~.... ..r <br />~ -, .. <br />-"-:., - J' <br />. .<... <br />.. ... ~ ..,"" <br />, '. <br />-- - <br />. <br />~>~"'t...,. <br />~ <br /> <br />. <br /> <br />- <br />~ ..... <br />- ... <br /> <br />'. <br /> <br />l& <br />= <br />. ....,~., <br /> <br />. <br />.~_'!'.r'':''',.:c <br />,~ .'~ <br />~...... <br /> <br />- ' <br /> <br />'" <br />-- <br /> <br />~ <br /> <br />" <br />- <br /> <br />Figure3 Aeolian dunes at Palisades (locallon shown ol1flgure 21 <br />The dune atlhe le1t side o!the phOlographlsoneo!the mOle active <br />duneSlfllhlsarea,WJlhelposed,unvegelatedtoosesandatl!screSl, <br />Allhough dune lorms are ptesenl on the !!mace surlace and reach <br />helghlsot2m(re[atrvelolhesurroundlflgletraceelevatlonLmuch <br />otlhelandscapeshowse'mlenceotdeflallon and recenllflactlv> <br />IfY Vegetation co~'er.s abundam though typically thlflltor e~ample. <br />cheat grass, shrubs. and occaSional mesquite I: cf)'ptogamic 501 tand <br />pedeslaldevelopmenlarecommon <br />