<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 />
|