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"itionlo~'!i!.,butappearstohav"d~sc.."d"dfrQman""tlr"lydifand ~.,l"dina ,u" probably du" tn " ...olutionary con ..... rK""'c. PSEUDObELODINA". 51'. A PI. 7, fl~". lla-13b; PI. 14, 14, f i[(s. 14 .l~; flit. tif ,G ETlIl~·t:TON and SCHUMACHER 1969, p. 465, pl. 1)8, fil;S. 5,9. Fig. 41; p. 1)8.1']. 68, figs. 1-4, Hg. Sc. IIERGSTROM, ~IVA and KAY 1974, 1'1. I, fig. 11. !Jescrlptio:l. TIllssp"ci"sh"sbelode1l;tornandolstodiformc on - The belod..lIHorCl" ha....... r"la,.I ....,ly short. cOClpr"ssed 'lIld sloarp-"d~ed C\lSP that is followed l'0steriorl y by a ro'o: of 10 to 1S small, sh.up. basally c,,,,fluent and l'lterally compr"ssed tl"ntlcles that sho"" .. near con_t..1nt inclination of about 20 degr...,s '0 the cusp. TI,c anterior m:lrgin of th" elernent is sharp and continuouslY cur...ed frum the basal marK,n to theti"of the cusp. Eachlat"tal farecatTlesanarrowlytOund..dcarina""loichheglnssllsh.tlyposteriorof the midline on th.. cuspand continues par~tl"l to th.. "n(eriOT ",argin down to the basal ",ar'l;n. 11,,, innH lateral ~"ce is slightly concav" with .. near plan." basal margin whereas (h" outer L,,:£ is con...ex ""It.h .1 basal l:IaTgln that fl."re" out",,,rd in the region of thecarin.1. Thcba5alcavity is trh.ngular l:\outl1n.. "'lthltsapexnear th" anterlot,.IIrgin about hatf "'''y ul'lh.. element. The O10re a5y""",trlc
- is slightly In",,,rd ddl"cc"d. Th.. anterior ,url!>ln Is contl11"o"sly curv"dfro,nr.hetlI1"fthecusplO the basal """rgln. Th"posterior.,,,rglO of the cusp Is ~lI&IHly cOllca"" and continuouS ... ttl> ttl.. k.. ~l"d COl\V"~ planar to slightly co"v.. ~ ...h"r~as tlL.. Inner later" I face and I tS basal .,argln ~r" broadly cnve> tWO ~ped"S "ere not found to b" ~r~.I.I ..e~,th"CompOSitiOnnfth.. apl'aratuSofthi" genus app"ar~ to be n./Iuced In com~arhon '"~ t\'IOre, norTllal apparatu>;~~ "f .!'i!!'.:!.!.;:'.~.
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The quehly 01 Itl,smitfohcheis heav
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FRONTISPIECE View south-west over C
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dlyislbl~ Into twO 5p~cl~5 ,assoc!n
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Page. l.ithostratigraphy CottlU Isl
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· ~----~_. Suped;l!l,ily Panderodo
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. -'~-'_-.:~~.;,.. ·, I Page Perio
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__ 14. Scanning electron .,icros"op
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Pag~ 29. ~na S~nUa (D,l\:;), B·~lO
Page 19:
I. I Acl
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underBtandlng of the gttuctur~l com
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'2.1 Collecttonof Sam.ple". The ort
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J ,- GEOLOC'CAI.SETTING Th... field
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..v"rY"herebYt"eUPI'"roroJ"vib~~lan
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hy "bout )00 "",t n3 uf t,,,,.ic la
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th~, roughly l,aralld til" oril\iru
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-16- Figure 3. View eastward of the
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4.2.2Squ!dCov.. S"nion. On th.. sou
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WJfI -,"- ~ --. ~._- ~'.':.':'::'''
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1111(11 ",~v" kln~flc ",wrllY rele~
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~. Sedillento\ngy of tn"CobbsAnlsec
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~~,.- ~.=- ~ .•.- ~_D' ~~'O ~:::'
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4.3 Sedl,.''',tology of the ColJbs
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Quarry Cove section. but contains A
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-32- ....aterneH_shorevolcanlcsands
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PALf.ONTOLOCYAND PALEOr.COLOGYOj'TH
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to b~ h.rgeLy restrlCfprl to .,qu~t
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Ii i I; America, it is not surprisi
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OfIlO!'lOSTlUTICRAPIlY OF TlIE COBB
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~------~ previously thought. The se
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7.1 Composltionand Growth. Conodont
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continuous syrr:netrlcal-asyremctrl
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1914), to a ..ell founded dl~,"{sul
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-Or FI,~ , \A,,~j "1,, ~
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Plate 16 ~I"es " part tal vle'o' of
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Ta"onoalcal clli"slflcatlon of the:
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I.'~ll{~er (19M), not"d the pr~s>
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or th" r"pon"d IIp,,cie~ of interes
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-61- chacacl",risticS, g. OlI"otod"
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,'. !J..~"J..£..1l. A-T, lh,.tacod
Page 85 and 86: ! i. · t;!:;::~~::g~~1~m::l~~:;;:i
Page 87 and 88: i. I spedes 1s very llillllhr. One
Page 89 and 90: DZIK1916,p. 435,F1g. 184-f. Descrtp
Page 91 and 92: latest Tremadocian. Previously (Lin
Page 93 and 94: , _1 _ Th"r" 1s a slngle posterior
Page 95 and 96: • Ftgllre 25. A~H. Drepanodlls sp
Page 97 and 98: ~. Connd01Hs ~f .,thh 'p"cies have
Page 99 and 100: a furrow. Asy""",nlcal fonns have a
Page 101 and 102: -83- ./ ~I~ ----- ------J~"
Page 103 and 104: tlp of th.. ~u~p. The oul'H lateral
Page 105 and 106: !.!.Fcv...££.1..!!. A, Rhodesogna
Page 107 and 108: Th" apparatus shows a simple sy=etr
Page 109 and 110: ." appa~at"s represent non-dellt.lc
Page 111 and 112: -9)- ETIII~GTO~ 1959. p. 284. p\. 3
Page 113 and 114: -95- ,\... r,~.]))'! ~! ~ ~ . ...;
Page 115 and 116: I The nearly sY1ll!lletricai gr"cli
Page 117 and 118: -99- / 4((Lf~~O~~, ~"''''{(A))~~~ "
Page 119 and 120: conodont "ith a rouod"d anterior m>
Page 121 and 122: J,I, ~~'1~~,-J;; A-f., :k", l;cl1"~
Page 123: allterlor ll'.arll.ins and deep [r[
Page 126 and 127: - •• ]...."'H ,wilr th~ "nf~rl,
Page 128 and 129: -110- ./ t~{;~l.t..· Wall1serodus
Page 130 and 131: I ,. ~s a~YL'"""trieal m"ltiCo~tale
Page 132 and 133: ....~y""""'trical blcostate drepana
Page 134 and 135: symm... try transition compf!slng f
Page 138 and 139: - allledorlyon al least OlLe of the
Page 140 and 141: I The latter [OTlIlis similar to [o
Page 142 and 143: a.e c~~uct"rh:"d by asyll\ll>Ctrlca
Page 144 and 145: Genus EOPLACOGNAfHUS HOIII
Page 146 and 147: 1. . procen develops from the cusp
Page 148 and 149: to fO TIIl the dent;c"l.oted proces
Page 150 and 151: pcri.~,eter 0' the anrerlr proce99
Page 152 and 153: ----- 1"-.-~- . ,-.,:ir4~~~.... ,.
Page 154 and 155: ut sh"llowly ncavated. The roof of
Page 156 and 157: paralleillith thelnncr-DIIrglnaLrld
Page 158 and 159: -------- a 81Ibg"n"s of Pdoniodu!I.
Page 160 and 161: -142- ~ b·J ~ ~~~~ ffi? Q ~& jJ)]
Page 162 and 163: ~.48speci_ns. Genus BALroNIOOUS LIn
Page 164 and 165: -146- setatanangleof60to!lOdegrees.
Page 166 and 167: B,t,LTONIOOOS VARIAllILIS (!!ergstr
Page 168 and 169: llgonodlnifom-prlonlodlnlfo... serl
Page 170 and 171: -152 / b~. ~~ ~ Figure 41. A-E,G,
Page 172 and 173: ·10n&,th....nt... rior ...&In of
Page 174 and 175: falOdlfortn6: l1gonodinUur1llS ~nd
Page 176 and 177: ] lINDSTIlOM 19nb. p. 109. p1. 22,
Page 178 and 179: - -160- of[h"-baSe,andfo~lhlsrea90n
Page 180 and 181: ~. HAMAR 1964, ~. 2b3, 1'1. I, OK"
Page 182 and 183: ore ouu,ard. 'I ) M.¥tedal. 18pec1
Page 184 and 185: Bassler, R.S., ln~. Classlfication
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Bryant, W.L., 1921. The Genesee con
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-170:' . H....r, C., 1964. The Kldd
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Lane, F.W., 1960. KingdOOl of the O
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Morrill, S.C., .976. A ne" Cambrian
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" SChlllldt, 11.,1933. Cephlllopode
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T>I"nhofel, IoI,H:: 1947. nw Siluri
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Wolska, t .• 1961. ~onodontY 1. O
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All sped,.."" X4~. SalOp Ie nu..ber
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I All sped;"en" X:iO. Sample numlj,
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.. All 8p~
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~._'- "'" specimens x52. Sample num
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PLATE 4
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PLATE 5
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13
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p,!ven in pa~enthes,-s. ) 2. 1'"He~
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PLATE 7
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PLATE 8
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PLATE 9
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PLATE lO
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PLATE II
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vt~~ WU~~ ~ ~ --,'• ., #:.. =' PL
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l~, lateral .... 1c.... "f ~YIf\lTl
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~"'''l' l~ numb.. ". f rofll ",h I
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PLATE 14
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1 I'" OUl"~ Ia"'~al vie... 01 hadJl
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.-.~, given in parentheses. Figur..
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PLATE 16
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~n
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, Figure A!. A limestone lense (out
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Photo..tc~ographs of so"", ()f the
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Figure B3. Sediment deposited in an
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ILLINGATE ISLANDS l USHES BIGHT . R
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FIGURE 2 CONODONT SAMPLE LOCALITIES
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OoJQrr~ Co~e S~ChO" CobbS Arm Sect,
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TABLE Ib r C;nQ~i"" frnm ·thQ C':n
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, r _. .--=- E SECTION COBBS A:~ ~E
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Pseudobelodlna n.•p. A b.lodellif
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I • 2 , I • 2 6 5 2 " .. " I I
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TABLE 10 Con'odont Snlldll~ from. t
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I-'__...,...~ I;~ DVE SECTION ~OBBS
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It,a.·~~it ombolodif ,m' Stlodtlla
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4 4 I I 12 • I 2 , I I 10 • I \
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