DavidRoyHunter.pdf
DavidRoyHunter.pdf DavidRoyHunter.pdf
DiSC"!5iOn'I.Formspe"iUCOnSideredbelOngingtotheg"nus~ o\'!Itndus.havebeenreported frllllstrata rangIng in age through DlOllt of the Ordnvic\.an in both the Midcontinent and No(th AthntiC Provinces (Bra"s01\andMehl, 1'133, 1'J3t.;Rhdes. i'J53; Lindsrrn... l'J55a.lo;ebers, 1966). \.indstrom(1971),hUdiffe...ntiacedthet""species~ dito,...,.of D. foneps havealov and long bas," "ith a amaH "ndulation of the abofO degreeS. This spedes is recovered from Middle and upper Ordovician nrata (\lebers, 1966; ll1ik, 1976). The ..icrostructure of this species show. little "hite rarter it allY ac all (Barne~·!!..:....!!' 1973). The o\.stod1!otll nf orepanoisrodus n·; 51'. A has a 10"1'. s.tnighr cusp and relatively 1_ .~d short base. "hili' an antero-basal angle of 60 to 80 degrees ......terlo..ly tlle e1e....nt is so"",..hat pointed. E"cepr tnr the· nistOdifoffl"S, the appantu"e. nf these four
i. I spedes 1s very llillllhr. One vonden whether the slight morphological dlff"n'nce" of the oistodifonD.ll alone 15 enough to diffe"rentiat" on the species level. V"n Wamel (1974) questions. Lindstrom'. (1971) diffenntlat1onofD.·forcep.. and~andc1ai_thatanyauhdiviSl0n of Dtepanoisrodus .....uld be poa"ibhonly on rh.. basis of blo~trtc data and.eartUiesl_thad". Sonethe.less. the ohtodHorllS of the Cobbs Arm Fonnatlon specI",. of Drepslloinodus arC rather unlfot1ll'in lh;ir characteristics and are d18- tinct f"OlloistoditonllS of the othn three speths mentioned. Considering also the relative ase ranges of th..c" lhr"e species it see:asal'propriate to, at leut tentativel)', place thl! Cobba Arm Formation ,,~du of ~ ~asanewspecies. Description. This difficult apparatus ot simple cone
- Page 36 and 37: 4.2.2Squ!dCov.. S"nion. On th.. sou
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- Page 42 and 43: ~. Sedillento\ngy of tn"CobbsAnlsec
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- Page 60 and 61: OfIlO!'lOSTlUTICRAPIlY OF TlIE COBB
- Page 62 and 63: ~------~ previously thought. The se
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- Page 66 and 67: continuous syrr:netrlcal-asyremctrl
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- Page 74 and 75: Ta"onoalcal clli"slflcatlon of the:
- Page 76 and 77: I.'~ll{~er (19M), not"d the pr~s>
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- 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
i.<br />
I<br />
spedes 1s very llillllhr. One vonden whether the slight morphological dlff"n'nce"<br />
of the oistodifonD.ll alone 15 enough to diffe"rentiat" on the<br />
species level. V"n Wamel (1974) questions. Lindstrom'. (1971) diffenntlat1onofD.·forcep..<br />
and~andc1ai_thatanyauhdiviSl0n<br />
of Dtepanoisrodus .....uld be poa"ibhonly on rh.. basis of blo~trtc data<br />
and.eartUiesl_thad".<br />
Sonethe.less. the ohtodHorllS of the Cobbs Arm Fonnatlon specI",.<br />
of Drepslloinodus arC rather unlfot1ll'in lh;ir characteristics and are d18-<br />
tinct f"OlloistoditonllS of the othn three speths mentioned. Considering<br />
also the relative ase ranges of th..c" lhr"e species it see:asal'propriate<br />
to, at leut tentativel)', place thl! Cobba Arm Formation ,,~du of ~<br />
~asanewspecies.<br />
Description.<br />
This difficult apparatus ot simple cone
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