DavidRoyHunter.pdf
DavidRoyHunter.pdf DavidRoyHunter.pdf
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
secllon. fo~ example, Is underhln by ",assi\/e volCllnl" ftnd co..p~ls"s a<br />
lo,,'erunlt of carbonate gratnstones rich In volcanic deHitus th..t appear<br />
to grade upward into w.. ckeston"~ dcl> 1n volcanic detdt"s. Thes" arc in<br />
I"rn succeeded by a " .. rles of aH"rnatlng ",udstones or "ackestones and<br />
grainstone", all of w!ltch ~te composed of rehtlvely ~ure limestoneS.<br />
pr".""'ahlythepurercarbonates..di....."t"aCCur:lulated.far .. noughoc"..,,,,,,rd<br />
to ucap.. the Influx of volcanic detdtus fro", the e"",rgent volcanic arc.<br />
'l1,ev.. rtlcalchanges, in the s"dl ....nt characteristics of the<br />
Quarry Cove section. are cnnstderedtobe the result of transgression of<br />
theltlddle Ordovlc1an sea onlO the arc volcanics. This Is possIbly the<br />
"e.ult of arc &ubstdence fo11o"I"1\ a ridge-trench IntHa"tlon (Kidd,<br />
De""yandNelson, 1(77). Thetransgr"sslonsuperimposedocean"ard facies<br />
over lOCIr .. landward facle" In acc"rdan~e with Io'al ther', La" (Walther,<br />
1894).<br />
upper t"'othlrdsof lhe section (Fig. \4), ..aybe lorlICati"eofa.'ltpsun<br />
comlitlon of transgression,.!.:.!. a sea level rise would ,,;ouae a<br />
shore""rd shift of" sr
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