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'2.1 Collecttonof Sam.ple". The ortgtnal nature of the Cobbs Arm I'ormat!on llthologi"s lias be..n masked by til... prClce~~e~ of pressure solution "nd recrystallizat ton. and dlsaggregatcd by Slludan and Devunlan faultlng and foldlne. A!.
digestion re'l"lr.. d as few 3S u,n days for purer limestone and ;1" .... n~ as t~..nty days ror impure lilllesto"". The u!sult"nt residu"s ,,,ere ,-,ashed through a 200 microo ,""sh sievp,dried(lndSepar"ledl"Tetrabrometh(lne (sp, gr, 2.88). 'Jlththe conodonts sen ling Ir. the heavy f, act Inn, by one of t'JO ...,thnd~: J) >:ra v - tty sen ling, for pert"'!~ of 12 hours or ""'c.. : and 2) centrlfu~aI ~er"c- ,lllnn, for iI period of t..,"'t~ "Inut.." :tt 250 revolut Ions pec minute Most "Ample" ....rp sep"rat"d by the first mHhod, but. ht'C;1"SC of the I"purf> natur.. of ",an~ sampt..,;. so"", v.. ry \ar9,e resld""s "'.. r .. r,'- coveced, In order to spped lip "ep.nat Ion of ""ch s'lmrle~, a cent r i fll~"l _thod "as us..d, Il.c'lldue ~a" plac"d into Tetrllbromelha,,,· In four S centi- ..,f>trediamater test tubes, "hich",er.. n
Page 3 and 4: The quehly 01 Itl,smitfohcheis heav
Page 5 and 6: FRONTISPIECE View south-west over C
Page 7 and 8: dlyislbl~ Into twO 5p~cl~5 ,assoc!n
Page 9 and 10: Page. l.ithostratigraphy CottlU Isl
Page 11 and 12: · ~----~_. Suped;l!l,ily Panderodo
Page 13 and 14: . -'~-'_-.:~~.;,.. ·, I Page Perio
Page 15 and 16: __ 14. Scanning electron .,icros"op
Page 17 and 18: Pag~ 29. ~na S~nUa (D,l\:;), B·~lO
Page 19: I. I Acl
Page 22 and 23: underBtandlng of the gttuctur~l com
Page 26 and 27: J ,- GEOLOC'CAI.SETTING Th... field
Page 28 and 29: ..v"rY"herebYt"eUPI'"roroJ"vib~~lan
Page 30 and 31: hy "bout )00 "",t n3 uf t,,,,.ic la
Page 32 and 33: th~, roughly l,aralld til" oril\iru
Page 34 and 35: -16- Figure 3. View eastward of the
Page 36 and 37: 4.2.2Squ!dCov.. S"nion. On th.. sou
Page 38 and 39: WJfI -,"- ~ --. ~._- ~'.':.':'::'''
Page 40 and 41: 1111(11 ",~v" kln~flc ",wrllY rele~
Page 42 and 43: ~. Sedillento\ngy of tn"CobbsAnlsec
Page 44 and 45: ~~,.- ~.=- ~ .•.- ~_D' ~~'O ~:::'
Page 46 and 47: 4.3 Sedl,.''',tology of the ColJbs
Page 48 and 49: Quarry Cove section. but contains A
Page 50 and 51: -32- ....aterneH_shorevolcanlcsands
Page 52 and 53: PALf.ONTOLOCYAND PALEOr.COLOGYOj'TH
Page 54 and 55: to b~ h.rgeLy restrlCfprl to .,qu~t
Page 56 and 57: Ii i I; America, it is not surprisi
Page 60 and 61: OfIlO!'lOSTlUTICRAPIlY OF TlIE COBB
Page 62 and 63: ~------~ previously thought. The se
Page 64 and 65: 7.1 Composltionand Growth. Conodont
Page 66 and 67: continuous syrr:netrlcal-asyremctrl
Page 68 and 69: 1914), to a ..ell founded dl~,"{sul
Page 70 and 71: -Or FI,~ , \A,,~j "1,, ~
Page 72 and 73: Plate 16 ~I"es " part tal vle'o' of
Page 74 and 75:
Ta"onoalcal clli"slflcatlon of the:
Page 76 and 77:
I.'~ll{~er (19M), not"d the pr~s>
Page 78:
or th" r"pon"d IIp,,cie~ of interes
Page 81 and 82:
-61- chacacl",risticS, g. OlI"otod"
Page 83 and 84:
,'. !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 136 and 137:
"itionlo~'!i!.,butappearstohav"d~sc
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
Page 186 and 187:
Bryant, W.L., 1921. The Genesee con
Page 188 and 189:
-170:' . H....r, C., 1964. The Kldd
Page 190 and 191:
Lane, F.W., 1960. KingdOOl of the O
Page 192 and 193:
Morrill, S.C., .976. A ne" Cambrian
Page 194 and 195:
" SChlllldt, 11.,1933. Cephlllopode
Page 196 and 197:
T>I"nhofel, IoI,H:: 1947. nw Siluri
Page 198 and 199:
Wolska, t .• 1961. ~onodontY 1. O
Page 200 and 201:
All sped,.."" X4~. SalOp Ie nu..ber
Page 202 and 203:
I All sped;"en" X:iO. Sample numlj,
Page 204 and 205:
.. All 8p~
Page 206 and 207:
~._'- "'" specimens x52. Sample num
Page 208 and 209:
PLATE 4
Page 210 and 211:
PLATE 5
Page 212 and 213:
13
Page 214 and 215:
p,!ven in pa~enthes,-s. ) 2. 1'"He~
Page 216 and 217:
PLATE 7
Page 218 and 219:
PLATE 8
Page 220 and 221:
PLATE 9
Page 222 and 223:
PLATE lO
Page 224 and 225:
PLATE II
Page 226 and 227:
vt~~ WU~~ ~ ~ --,'• ., #:.. =' PL
Page 228 and 229:
l~, lateral .... 1c.... "f ~YIf\lTl
Page 230 and 231:
~"'''l' l~ numb.. ". f rofll ",h I
Page 232 and 233:
PLATE 14
Page 234 and 235:
1 I'" OUl"~ Ia"'~al vie... 01 hadJl
Page 236 and 237:
.-.~, given in parentheses. Figur..
Page 238 and 239:
PLATE 16
Page 240 and 241:
~n
Page 242 and 243:
, Figure A!. A limestone lense (out
Page 244 and 245:
Photo..tc~ographs of so"", ()f the
Page 246 and 247:
Figure B3. Sediment deposited in an
Page 250 and 251:
ILLINGATE ISLANDS l USHES BIGHT . R
Page 252 and 253:
FIGURE 2 CONODONT SAMPLE LOCALITIES
Page 254 and 255:
OoJQrr~ Co~e S~ChO" CobbS Arm Sect,
Page 256 and 257:
TABLE Ib r C;nQ~i"" frnm ·thQ C':n
Page 258 and 259:
, r _. .--=- E SECTION COBBS A:~ ~E
Page 260 and 261:
Pseudobelodlna n.•p. A b.lodellif
Page 262 and 263:
I • 2 , I • 2 6 5 2 " .. " I I
Page 264 and 265:
TABLE 10 Con'odont Snlldll~ from. t
Page 266 and 267:
I-'__...,...~ I;~ DVE SECTION ~OBBS
Page 268 and 269:
It,a.·~~it ombolodif ,m' Stlodtlla
Page 270 and 271:
4 4 I I 12 • I 2 , I I 10 • I \
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