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4.3 Sedl,.''',tology of the ColJbs ArtllForaat10n. The Middle Ordovidan volcanism 1n the Cobbs P,.en area is thOu&:t to have been very actIve bec"-""" the volcanics of tho: sUllmIerford Grnu;> an, dOlJinated by basic flows "od sublOuine pillo,,", basahs ",Ilh only minor IncerV.y"ted tuffs and agglomerate" (Harris, 196b). 1I0wever, In the , Squid Cove-Tilt Cov; aTea (f~g. 2), t"" voleanle gtratlgraphy of the Summerford Croup
secllon. fo~ example, Is underhln by ",assi\/e volCllnl" ftnd co..p~ls"s a lo,,'erunlt of carbonate gratnstones rich In volcanic deHitus th..t appear to grade upward into w.. ckeston"~ dcl> 1n volcanic detdt"s. Thes" arc in I"rn succeeded by a " .. rles of aH"rnatlng ",udstones or "ackestones and grainstone", all of w!ltch ~te composed of rehtlvely ~ure limestoneS. pr".""'ahlythepurercarbonates..di....."t"aCCur:lulated.far .. noughoc"..,,,,,,rd to ucap.. the Influx of volcanic detdtus fro", the e"",rgent volcanic arc. 'l1,ev.. rtlcalchanges, in the s"dl ....nt characteristics of the Quarry Cove section. are cnnstderedtobe the result of transgression of theltlddle Ordovlc1an sea onlO the arc volcanics. This Is possIbly the "e.ult of arc &ubstdence fo11o"I"1\ a ridge-trench IntHa"tlon (Kidd, De""yandNelson, 1(77). Thetransgr"sslonsuperimposedocean"ard facies over lOCIr .. landward facle" In acc"rdan~e with Io'al ther', La" (Walther, 1894). upper t"'othlrdsof lhe section (Fig. \4), ..aybe lorlICati"eofa.'ltpsun comlitlon of transgression,.!.:.!. a sea level rise would ,,;ouae a shore""rd shift of" sr
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 24 and 25: '2.1 Collecttonof Sam.ple". The ort
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 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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