12. shore laboratory report on cenozoic …y. takayanagi, m. oda table 1 distribution of cenozoic...

12. SHORE LABORATORY REPORT ON CENOZOIC PLANKTONIC FORAMINIFER A: LEG 33

Yokichi Takayanagi and Motoyoshi Oda, Institute of Geology and Paleontology,Tohoku University, Sendai, Japan

INTRODUCTION

Calcareous sediments from Sites 315, 316, 317, and318 were examined in order to determine the strati-graphic distribution of Cenozoic planktonic foramini-fers in cores recovered on Leg 33 of the Deep Sea Drill-ing Project. These sites are south of the HawaiianIslands: Sites 315 and 316 located along the LineIslands, Site 317 on the Manihiki Plateau, and Site 318in an elongate perched basin on the Tuamotu Ridge.

The samples, with a dry weight of 2 to 5 g werewashed on a 200-mesh sieve (opening: 0.074 mm) forforaminiferal study. All species encountered in the re-spective samples are shown in Tables 1 to 5, with indi-cations of their relative abundances. The abundance ofeach species is shown by a letter symbol as follows:

Relative Abundance Percent

P (Very rare)R (Rare)C (Common)A (Abundant)VA (Very abundant)

<22-44-16

16-32>32

The number of specimens generally exceeds far morethan 400 in each count. However, in the case of samplespoor in foraminifers (less than 200 specimens) onlypresence is indicated by the symbol " + " .

LIST OF SPECIESAbundant well-preserved planktonic foraminifers,

ranging in age from Eocene to Pleistocene occur in theexamined cores. As far as classification of the Cenozoicforms is concerned, a noteworthy contribution hasrecently been made by Fleisher (1974). His classificationfor foraminiferal genera differs somewhat from those ofprevious workers, but is thus adopted in this report withsome reservations for future work. In order to avoid tax-onomic confusion, the full species name, author, anddate of original publication are listed below, with an in-dication of the genus in which the species was originallyplaced.Acarinina boudreauxi Fleisher, 1974Acarinina broedermanni (Cushman and Bermudez, 1949)(ex Globorotalia)Acarinina mckannai (White, 1928) (ex Globigerinà)Acarinina mattseensis alticonica Fleisher, 1974Acarinina planodorsalis Fleisher, 1974Acarinina pseudotopilensis Subbotina, 1953Acarinina punctocarinata Fleisher, 1974Acarinina rotundimarginata Subbotina, 1953

Acarinina soldadoensis (Bronnimann, 1952) (ex Globi-gerinà)Acarinina spinuloinflata (Bandy, 1949) (ex Globigerinà)Biorbulina bilobata (d'Orbigny, 1846) (ex Globigerinà)Candeina nitida d'Orbigny, 1839Cassigerinella chipolensis (Cushman and Ponton, 1932)(ex Cassidulina)Catapsydrax africanus (Blow and Banner, 1962) (exGlobigerinita)Catapsydrax dissimilis ciporensis (Blow and Banner,1962) (ex Globigerinita)Catapsydrax dissimilis dissimilis (Cushman and Ber-mudez, 1937) (ex Globigerinà)Catapsydrax globiformis (Blow and Banner, 1962) (exGlobigerinita)Catapsydrax howei (Blow and Banner, 1962) (exGlobigerinita)Catapsydrax martini martini (Blow and Banner, 1962)(ex Globigerinita)Catapsydrax martini scandretti (Blow and Banner, 1962)(ex Globigerinita)Catapsydrax penis (Todd, 1957) (ex Globigerinita)Catapsydrax riveroae (Bermudez, 1961) (ex Globi-gerinita))Catapsydrax stainforthi Bolli, Loeblich, and Tappan,1957Catapsydrax unicavus primitivus (Blow and Banner,1962) (ex Globigerinita)Catapsydrax unicavus unicavus Bolli, Loeblich, and Tap-pan, 1957"Catapsydrax" echinatus Bolli, 1957Chiloguembelina cubensis (Palmer, 1934) (ex Guem-beliná)Globanomalina pseudoscitula (Glaessner, 1937) (exGloborotalia)Globigerinà angulisuturalis Bolli, 1957Globigerinà apertura Cushman, 1918Globigerinà bulloides d'Orbigny, 1826Globigerinà calida Paker, 1962Globigerinà decoraperta Takayanagi and Saito, 1962Globigerinà digitata Brady, 1879Globigerinà druryi Akers, 1955Globigerinà falconensis Blow, 1959Globigerinà nepenthes Todd, 1957Globigerinà officinalis Subbotina, 1953Globigerinà ouachitaensis ciperoensis Bolli, 1957Globigerinà ouachitaensis gnaucki Blow and Banner,1962Globigerinà ouachitaensis ouachitaensis Howe andWallace, 1932Globigerinà parabulloides Blow, 1959Globigerinà praebulloides leroyi Blow and Banner, 1962Globigerinà praebulloides occlusa Blow and Banner, 1962

451

Y. TAKAYANAGI, M. ODA

TABLE 1Distribution of Cenozoic Planktonic Foraminifers, Hole 315A

TABLE 2Distribution of Cenozoic Planktonic Foraminifers, Site 316

Age

Zone

^ ^ - ^ ^ Sample^ ^ ^ ^ ^ (Interval in cm)

Species ^ " ^ - ^ ^

Biorbulina bilobataCatapsydrax dissimüis ciperoensisC. dissimüis dissimilisC. unicarvus unicarvusGlobigerina angustiumbilicata

G. decorapertaG. druryiG. falconensisG. nepenthesG. ouachitaensis ciperoensis

G. parabulloidesG. praebulloides leroyiG. praebulloides praebulloidesG. woodiGlobigerinatella insueta

Globigerinella siphonifera siphoniferaGlobigerinita glutinataG. uvulaGlobigerinoides bolliiG. extremus

G. gomitulusG. obliquusG. quadrilobatus immaturusG. quadrilobatus primordiusG. quadrilobatus sacculifer

G. quadrilobatus trilobusG. subquadratusGloboquadrina altispira altispiraG. altispira globosaG. deshicens advena

G. dehiscens dehiscensG. dehiscens praedehiscensG. galavisiG. tripartita tripartitaG. venezuelana

Globorotalia acostaensisG. birnageaeG. continuosaG. cultrataG. fohsifohsi

G. fohsi lobataG. kugleriG. lenguaensisG. merotumidaG. miozea cibaoensis

G. obesaG. opima nanaG. opima opimaG. peripheroacutaG. peripheroronda

G. prasaepisG. pseudokugleriG. siakensisG. cf. siakensisG. tumida plesiotumida

Globorotaloides hexagonusG. suteriG. valiabilisOrbulina suturalisO. universa

Pulleniatina primalisSphaeroidinellopsis seminulina seminulinaS. subdehiscensSubbotina gortanii gortaniiTenuitella clemenciaeT. praestainforthi

Late Miocene

N.1

7

1-1,

97-9

9

1-5,

80-

82

3-1,

84-8

6

3-3,

60-

62

3-5,

32-3

4

P P P

C C C R

PR P C P

P PC C C C V

P CP

P P

PP P P

P P

C C P P

R P R P

C C R P CC P CC R R P

P

P P C C R

C P A C C

P C C C P

C P RP

P

P R C C

P

PP

P P R P P

R P PR C P C PP A C C R

Mid.Mio.

N.1

3?

N.1

2

Early Miocene

N.8

?

N.6

N.4

4-1,

102

-104

4-3,

77-

79

5-1,

116

-118

6-1,

84-

86

6-3,

103

-105

R

P

P

RP

C C R + AP + C

PR

R P

C P P +P P

C A P + C

CR

PP C R + C

VA C CP

R

PP.

P

R

R P

CP +

V A C + AC C P + A

+

R R +R P

a

P.21

7-1,

118

-120

8-1,

106-

108

8-3,

31-3

3

9-2,

12

-14

PP P PR P RR R A V

A R P

RC P

V C CC P

P

cP

P PC P C

C V A

Pc

R

RP C C

C C R VR

C P R RP

P

PP

P C R

Age

Zone

^ ^ ^ _ Sample^ ~ ^ ^ ^ (Interval in cm)

Species ^ ^ \ ^ ^

Acarinina soldadoensisGlobanomalina pseudoscitulaGlobigerina bulloidesG. calidaG. decoraperta

G. falconensisG. nepenthesG. rubescensG. woodiGlobigerinella siphonifera siphonifera

Globigerinita glutinataG. uvulaGlobigerinoides bolliiG. conglobatusG. elongatus

G. extremusG. gomitulusG. quadrilobatus immaturusG. quadrilobatus sacculiferG. quadrilobatus trilobus

G. ruber"Globigerinoides" tenellusGloboquadrina altispira altispiraG. conglomerataG. pseudofoliata

G. venezuelanaGloborotalia acostaensisG. cultrataG. dutertreiG. imitata

G. kugleriG. mayeriG. siakensisG. tosaensisG. truncatulinoides

G. tumida tumidaG. ungulataGloborotaloides hexagonusOrbulina suturalis0. universa

Pulleniatina obliquiloculataSphaeroidinella dehiscensSphaeroidinellopsis seminulina seminulinaS. subdehiscensTenuitella minutissimaTurborotalita humilis

Pleist.

N.2

2

e j a • b• [

]«-!?,°"\ z ;OH

1-1,

70-

721-

3, 1

30-1

321-

5,90

-92

2-1,

130

-132

3-1,

138

-140

PP R

C P R +

P P +

R C R +

A P C +P

P PP

P

R R +R C R +P R

C R +

PC C P

R PC A V

PP C C

A C CRP P

P +P P +

A A CP R

P

c ! d

* ;

4-1,

87-

899-

1, 1

20-1

2210

-1,

83-8

512

-2,4

8-50

14-1

, 11

8-12

0

+

+

+

+

+

+

+ +

16-1

,70-

7217

-1,

128-

130

Oligocene.

Early Miocene.

Oligocene.cEarly Eocene.dPaleocene?.

Globigerina praebulloides praebulloides Blow, 1959Globigerina praedigitata Parker, 1967Globigerina rubescens Hofker, 1956Globigerina woodi Jenkins, 1960Globigerinatella insueta Cushman and Stainforth, 1945Globigerinatheka index index (Finlay, 1939) (ex Globi-gerinoides)

452

CENOZOIC PLANKTONIC FORAMINIFERA

TABLE 3Distribution of Cenozoic Planktonic Foraminifers, Hole 317

TABLE 3 - Continued

Age

Zone

^ \ ^ Sample^ ^ ^ (Interval in cm)

Species ^ \ ^ ^

Biorbulina bilobataCandeina nitidaCatapsydrax dissimilis ciperoensisC. dissimilis dissimilisC. unicavus unicavus

Globigerina angustiumbilicataG. bulloidesG. calidaG. falconensisG. praebulloides leroyi

G. praebulloides occlusaG. rubescensG. woodiGlobigerinella siphonifera involutaG. siphonifera siphonifera

Globigerinita glutinataG. iotaG. uvulaGlobigerinoides conglobatusG. elongatus

G. quadrilobatus altiaperturusG. quadrilobatus immaturusG. quadrilobatus primordiusG. quadrilobatus sacculiferG. quadrilobatus trilobus

G. ruber"Globigerinoides" tenellusGloboquadrina altispira altispiraG. conglomerataG. dehiscens dehiscens

G. dehiscens praedehiscensG. pseudofoliataGloborotalia crassaformisG. cultrataG. dutertrei

G. kugleriG. obesaG. peripherorondaG. siakensisG. tosaensis

G. truncatulinoidesG. tumida tumidaG. ungulataGloborotaloides hexagonusG. suteri

Pleistocene

N.2

2

Early

Miocene

Z Z

1-1,

70-

721-

3, 7

0-72

1-4,

70-

721-

5, 7

0-72

2-1,

80-8

2P PP

P

cP P

R P PP P

P

P A A A

C R R P

C V A V VP PP P P P AC R C P

P R P

PA P P P P

C P R P PR R R

C A A AP R P R

PP

P

RP PP P

CP P

P

RP

PR R P

PP

P

N.4

2-3,

110

-112

2-5,

70-

72

P

P

A V

P

CP

A C

A C

CR

RP

P P

AP PP

P

Age

Zone

^ - ^ Sample^ \ ^ (Interval in cm)

Species ^ v .

Orbulina suturalisO. universaPulleniatina obliquiloculataSphaeroidinella dehiscensSubbotina gortanii gortanii

Tenuitella anfractaT. clemenciaeT. minutissimaTurborotalita humilisT. praepumilio

Pleistocene

N.2

2

EarlyMiocene

Z Z

1-1,

70-

721-

3, 7

0-72

14,

70-7

21-

5, 7

0-72

2-1,

80-8

2

PC R C PR PP R

P P

P PP

N.4

2-3,

110

-112

2-5,

70-

72

P

PP

Globigerinatheka index tropicalis (Blow and Banner,1962) (ex Globigerapsis)Globigerinatheka mexicana barri Brönnimann, 1952Globigerinatheka mexicana kugleri (Bolli, Loeblich, andTappan, 1957) (ex Globigerapsis)Globigerinatheka mexicana mexicana (Cushman, 1925)(ex Globigerina)Globigerinatheka semiinvoluta (Keijzer, 1945) (ex Globi-gerinoides)Globigerinatheka senni (Beckmann, 1953) (ex Sphaer-oidinella)Globigerinatheka subconglobata curryi Proto Decimaand Bolli, 1970Globigerinatheka subconglobata luterbacheri Bolli, 1972Globigerinatheka subconglobata subconglobata (Chali-lov, 1958) (ex Globigerinoides)Globigerinella siphonifera involuta (Cushman, 1917) (exGlobigerina)Globigerinella siphonifera siphonifera (d'Orbigny, 1839)(ex Globigerina)Globigerinita glutinata Egger, 1893) (ex Globigerina)Globigerinita iota Parker, 1962Globigerinita uvula (Ehrenberg, 1861) (ex Pylodexia)Globigerinoides bollii Blow, 1959Globigerinoides conglobatus (Brady, 1879) (ex Globi-gerina)Globigerinoides elongatus (d'Orbigny, 1926) (ex Globi-gerina)Globigerinoides extremus Bolli and Bermudez, 1965Globigerinoides gomitulus (Seguenza, 1880) (ex Globi-gerina)Globigerinoides obliquus Bolli, 1957Globigerinoides quadrilobatus altiaperturus Bolli, 1957Globigerinoides quadrilobatus fistulosus (Schubert, 1910)(ex Globigerina)Globigerinoides quadrilobatus immaturus LeRoy, 1939

453


TABLE 4Distribution of Cenozoic Planktonic Foraminifers, Hole 317B

Age Pleistocene i Pliocene Late Miocene 1 Middle Miocene

Zonec<•> < s

Sample(Interval in cm)

Species

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(N Tj• M <t-H - i <N <N

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<N <N <N <N ©© © © © -H"T1 T4 T1 V ©© © © © ©O © © © .-H

(S N •<t fS

© ©© ©

Acarinina boudreauxiA. broedermanniA. mattseensis alticonicaA. punctocarinataA. rotundimarginata

A. spimdoinflataBiorbulina büobataCandeina nitidaCassigerinella chipolensisCatapsydrax africanus

P P P P P R C P PP P

C. dissimilis ciperoensisC. dissimilis dissimilisC. globiformisC. howeiC. martini martini

C. martini scandrettiC. perusC. riveroaeC. stainforthiC. unicavus primitivus

C. unicavus unicavus"Catapsydrax " echinatusChiloguembelina cubensisGlobigerina angulisuturalisG. angustiumbilicata

G. aperturaG. bulloidesG. calidaG. decorapertaG. digitata

P PR P

P P P PR C P

P

P RC R A A P A C V

P P P

C C C V C

P P

V C A A C

G. druryiG. falconensisG. nepenthesG. officinalisG. ouachitaensis ciperoensis

P P P PR R P P C R R

P P PP P C R R R P P R P

C C C A P

P P

G. ouachitaensis gnauckiG. ouachitanensis ouachitaensisG. parabulloidesG. praebulloides leroyiG. praebulloides occlusa

G. praebulloides praebulloidesG. praedigitataG. rubescensG. woodiGlobigerinatheka index index

P PA C A P

G. index tropicalisG. mexicana barriG. mexicana kugleri

454


TABLE 4 - Continued

Early Miocene Oligocene Late Eocene Mid. Eocene

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T } • <N <N •<fr <N

<N <N CO<N <N <N

<N Tj•

lA «A<N <N

<N <N

VO f••-<N <N

<N •^• <N -rf <N

ó ó H Λ r)CO CO CO CO CO

•< • < N Tj• < N TJ•

<N co co Tt r fCO CO CO CO CO CO CO CO CO CO

<N • • <N

oó oo ONCO CO CO

<N ^

o o

P P P C P A P P P P P P P P PR C

V V V

P P

A C

PP P P P P P P P

R P PP R P

P PP P P P P P

V PP

PPP P

RP P

P R

P R C C C C P

PP P P

P P C R P R R C P R R

R C C C C C C A P A

P P P P P

R C A V V

P C R P C

V V V V C

R C C C R

VP Cc c

R R R

A C V V

R R

V V C

C C P P

P P

VP P R P C C

P R

R C R p Pp p p

A R PP P

P P C P C R P PP P

R A C P P P P

P C R R C P P

A C P P R P_JL

P R P R RR C

P PA R

455


TABLE 4 - Continued

Age

Zone

^ ^ ^ Sample^ ^ - ^ ^ (Interval in cm)

Species ^ ^ v .

G. mexicana mexicanaG. semiinvoluta

G. senniG. subconglobata luterbacheriG. subconglobata subconglobataGlobigerinella siphonifera siphoniferaGlobigerinita glutinata

G. iotaG. uvulaGlobigerinoides bolliiG. conglobatusG. elongatus

G. extermusG. obliquusG. quadrilobatus altiaperturusG. quadrilobatus fistulosusG. quadrilobatus immaturus

G. quadrilobatus primordiusG. quadrilobatus sacculiferG. quadrilobatus trilobusG. niberG. sicanus

G. subquadratus"Globigerinoides" tenellusGlobigerinatella insuetaGloboquadrina altipsira alitspiraG. altispira globosa

G. binaiensisG. conglomerataG. dehiscens advenaG. dehiscens dehiscensG. dehiscens praedehiscens

G. galavisiG. larmeui larmeuiG. larmeui obesaG. pseudofoliataG. psuedovenezuelana

G. selliiG. tripartita tapuriensisG. tripartita tripartitaG. venezuelanaGloborotalia ampliapertura

G. cerroazulensis pomeroliG. crassaformisG. cultrataG. dutertreiG. fohsi lobata

i

Pleistocene j Pliocene

(N H <^01 rN -H

Z Z 2

1-1, 100-102

1-2, 100-102

1-4, 100-102

2-2, 100-102

2-4, 100-102

R R C CA A A C

PR P

C C R C CR C R C C

C CR

C PC R C C

P C R A PP P PA A A A V

R P

P

P P

PP P

P P

3-2, 100-102

3-4, 100-102

4-2, 100-102

4-4, 101-103

5-2, 100-102

P P R R RA C C C A

P P P

R R R R PP R

C R C C CR R C C C

CR C A C C

C A C A CR C C R CC C

R C R P RR P

P P R R

P P P

00

z

Late Miocene ! Middle Miocenei

Z Z

5-4, 100-102

6-2, 100-102

6-4, 100-102

7-2, 100-102

7-4, 100-102

C R C P PC R C C A

PP

R R P R PP

C C C CC C C C C

A A A A R

A A C C CC C C C R

R C R PR C

P

P P

P P P

8-2, 100-102

8-4, 100-102

9-2, 100-102

9-4, 100-102

10-2, 100-102

P PA C A A A

P P R CP

P

C C C C CC R C R C

C C C R C

R C C C AC R C R R

R C C P CP P P P

P R RP P P

P P P

P P

>o •<t

z z

10-4, 100-102

11-2, 100-102

12-2, 100-102

12-4, 100-102

13-2, 100-102

P P PV A A A C

P R R A

CC C C C R

R C C C A

R C C C PP C P R C

P

R P R P RP P R

P PP R

P

P P P

P P P

z z

13-4, 100-102

14-2, 100-102

16-2, 100-102

16-4, 97-99

18-2,114-116

C A C C C

R R R R

C R C C

V V A A R

A C C A CP R C R C

P

C R A

PC R R R C

P

P P P PR R C

P P

P P P R R

P

P P

456


TABLE 4 - Continued

Early Miocene

002 z

^o2>oZ

18-4, 100-102

19-2, 100-102

19-4, 100-102

20-2, 102-102

20-4, 100-102

C A A V V

P P A C V

P P P

P A C P

C C C R RC C C C C

P P P

C P R

R PV C C R PC P P

R R

PC P C R

P P

P P P P

z

N N N NH O O O O

"71 ó © © óON O O O O

N * N <t NN (N M W 4<N CM CN <N ( N

c c c c

C C C R R

P C

P P RP PP

P

P P

P P C

P RP P

Oligocene

cù

<N <N <N CS (N

o o o o oó © © © ©o o o o oT J < S •>tf• CS <N

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C R C P P

P P C

P

R

P

R R PR P R

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fS N M N MO O O O O

6 6 0 6 6O O O O O

TJ• < N •<a• C N rj•

r•• oó oó σs σ\N N N N N

P

R

P

P P

P P

P P C P C

o

αi

(S IΛ N N NO O O O O

ò r O 0 OO O O O O

N ^• (S i• N

ó ó Λ <Sco ci ro c~> ro

P

C C C R R

C

(‰

N N N N nO O O O O

© © © © 0© o o © ©Tj• (N •<t <N •&

<s co m TJ• •<*CO CO CO CO CO

R

P

P

C R P

C R

R R PR

P R C

P P P

00

PL|

Late Eocene

αi αi αi

N N N N N© © O © ©

© © 0 © ©© © © © ©

M ^• N ^ Nv> >/l \O *<O t~CO CO CO CO CO

PC V

P

P R

P R R

p -

P R P

P

Mid. Eocene

CO

(N <N <N (S (N© © © © O

© © © © ©© © © © ©

•<tf <N TJ- <N r j-

r oò do σ\ σ\CO CO CO CO CO

P PV

R C C C PR

P P R

R

PP

C

P

P

P

P

P P R C

R P C

P P P

P P C C

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to ©© ©

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P R

P P

P

C R

457


TABLE 4 - Continued

Age

Zone

^ ^ v . Sample^ ^ - ^ ^ (Interval in cm)

Species ^ ^ \ ^

G. humerosaG. inflataG. kugleriG. margaritaeG. mendacis

G. miozea cibaoensisG. obesaG. opima nanaG. opima opimaG. peripheroronda

G. praemenardii archeomenardiiG. prasaepisG. pseudokugleriG. scitulaG. sjakensis

G. cf. siakensisG. tumida plesiotumidaG. tumida tumidaG. ungulataGloborotaloides hexagonus

G. suteriG. variabilisHantkenina alabamensisMorozovella aragonensis caucasicaM. coronata

M. lehneriOrbulina suturalisO. universaPseudohastigerina micraPulleniatina obliquiloculata

P. primalisP. spectabilisSphaeroidinella dehiscensSphaeroidinellopsis seminulina kochiS. seminulina seminulina

S. subdehiscensSubbotina angioporoidesS. gortanii gortaniiS. gortanii praeturrilinaS. linaperta

Tenuitella clemenciaeT. gemmaT. praestainforthiTruncorotaloides pseudodubiusT. topilensis

Turborotalita humilisT. pumilioZeauvigerina zealandica

rPleistocene i Pliocene

N.22

N.21

N.19

1-1, 100-102

1-2, 100-102

1-4, 100-102

2-2, 100-102

2-4, 100-102

P

P P P PP

R P R C C

P P P R

P P P C C

P PP

3-2, 100-102

3-4, 100-102

4-2, 100-102

4-4, 101-103

5-2, 100-102

P P

P P

P

P R R P PPP

P P PR C C R P

P P P

P P P P

R C R PP R P PP P C P C

P P P

P

00

Z

1Late Miocene Middle Miocene

i

N.17

N.16

N.15

N.14

5-4, 100-102

6-2, 100-102

6-4, 100-102

7-2, 100-102

7-4, 100-102

P

P

P

PP R P

P P P PC C R C C

P P P PP PPP P PR C R C P

P P P P

P

8-2, 100-102

8-4, 100-102

9-2, 100-102

9-4, 100-102

10-2, 100-102

R

P

P P

RC A C C C

P

P RR C C P C

C R R R P

10-4, 100-102

11-2, 100-102

12-2,100-102

12-4, 100-102

13-2, 100-102

C

P PP R R P

P P RR C P C P

P P P R

N.13

N.12

13-4, 100-102

14-2, 100-102

16-2, 100-102

16-4, 97-99

18-2, 114-116

R C P

R

P

CC

P P P PP R R

PR R P

P

458


TABLE 4 - Continued

Early Miocene Oligocene Late Eocene Mid. Eocene

ó òo o

r- oo <×> o\ σ\s s N a

<N rl-

ro en

A V A C V V V V R

P P P P P P PP P P P

C VP P P P

C PP C R

R P

C A

C

C PP

C C R R C C A C A C C C

P P A R P

R C CP

R R R P R C C C P P C C A C R P P P PP

P P C C A

PC CC C

C A

P R P P C P

P C PP P P

C P C C RP P C R PP P

P

PP P P

P PP R P C P R C

C RA C V V V V A V R C

P P RC C A P

A CA A

P AC C

R P

459


TABLE 5Distribution of Cenozoic Planktonic Foraminifers, Site 318

Age

Zone

^ ^ ^ ^ Sample^^>v_ (Interval in cm)

Species ^^~~^^

Acarinina boudreauxiA. makannaiA. mattseensis alticonicaA. planodorsalisA. pseudotopilensis

A. punctocarinataA. soldadoβnsisA. spinuloinflataBiorbulina bilobataCandeina nitida

Catapsydrax africanusC. dissimilis ciperoensisC. dissimilis dissimilisC. penisC. unicavus primitivus

C. unicavus unicavusChiloguembelina cubensisGlobigerina angustiumbilicataG. aperturaG. bulloides

G. calidaG. decorapβrtaG. falconensisG. nepenthesG. officinalis

G. ouachitaensis ciperoensisG. parabulloidesG. praebulloides leroyiG. praebulloides occlusaG. praebulloides praebulloides

G. rubescensG. woodiGlobigerinatheka index indexG. mexicana barriG. mexicana kugleri

G. mexicana mexicanaG. senniG. subconglobata curryiGlobigerinella siphonifera siphoniferaGlobigerinita glutinata

G. uvulaGlobigerinoides bolliiG. conglobatusG. elongatusG. extremus

G. gomitulusG. obliquusG. quadrilobatus altiaperturusG. quadrilobatus flstulosusG. quadrilobatus immaturus

G. quadrilobatus primordiusG. quadrilobatus sacculiferG. quadrilobatus trilobusG. ruberG. subquadratus

Globoquadrina altispira altispiraG. altispira globosaG. binaiensisG. dehiscens advenaG. deshicens dehiscens

Pliocene

N.21

N.19

N.18

1-2,100-102

1-4, 100-102

2-2, 140-142

4-1, 100-102

4-4, 100-102

P PP P

P P

P C P P PA P C A C

P P PR P

R

C C C R CC R C A R

CPP C C P PR C C

P C C

R P P C C

P CC A C C C

P C C C AC C P C CA A A

P P P P

P

1

Late Mio.|Mid. Mio.

N.17

N.16

5-2, 100-102

5-4,100-102

6-2, 100-102

6-4, 100-102

7-2, 100-102

R R PP

P

P P C P

PP C C A A

P P R PP R P C C

R R P PR C C A A

P R RP P

P P

A C C C P

PC C C C A

C A C R C

C A C R CC C C R C

P

R P C C RP

R P R P PP P

N.15

N.14

N.9?

Early Miocene

Z

7-4, 100-102

8-2,100-102

9-2, 95-97

10-2, 108-110

10-4, 100-102

P R

P C +RP P

PP

C C

P

C C

PR C + V A

R C C

A CP C

C A C C

C A + A A

A C + C R

CP

P PP + RC + P C

N.4

Oligocene a

P.22?

P.20?

P. 19?

P.15?

11-2,97-99

11-4, 100-102

12-2, 104-106

14-1,99-101

14-3, 100-102

P PP P

+

P P +

c c c c

V +

C V V

c +P R C P

A A

++

C P

C P

P P R

Mid. Eocene r

P.14?

P.13?

15-2, 120-122

16-2, 53-55

17-2, 100-102

20-2, 100-102

20-4,91-93

+

+

ft. ft. ft.

ft. O

H

PA CC

ft. <

+

+

++

21-2, 100-102

22-2, 93-95

224, 144-146

23-2, 106-108

24-2, 102-104

+ +

+ ++

+

+

+

+

+

OH' P.10?

Early Eoc.

1 °"

24-4, 81-83

25-2, 104-106

26-2, 80-82

26-4, 81-83

29-2, 80-82

+

++

+

+

+

30-2, 12-14

31-2,48-50

+

+

460


TABLE 5 - Continued

Age

Zone

N . Sample""~•ss. (Interval in cm)

Species ^ ^ ^ ^ ^

G. deshicens praedehiscensG. larmeui obesaG. pseudofoliataG. pseudovenezuelanaG. sellii

G. tripartita tripartitaG. venezuelanaGloborotalia acostaensisG. ampliaperturaG. cerroazulensis pomeroli

G. crassaformisG. cultrataG. humerosaG. kugleriG. mendacis

G. miozea cibaoensisG. obesaG. prasaepisG. pseudoampliaperturaG. scitula

G. cf. siakensisG. tumida plesiotumidaG. tumida tumidaG. ungulataGloborolotaloides hexagonus

G. suteriHantkenina sp.Morozovella aragonensis aragonenesisM. aragonensis caucasicaM. coronata

M. formosaM. lehneriM. cf. perclareOrbulina suturalis0. universa

Pseudohastigerina microPulleniatina obliquiloculataP. primalisP. spectabilisSphaeroidinella dehiscens

Sphaeroidinellopsis seminulina kochiS. seminulina seminulinaS. subdehiscensSubbotina angioporoidesS. boweri

S. gortanii gortaniiS. gortanii praeturrilinaS. linapertaS. winkleriTenuitella gemma

T. praestainforthiTruncorotaloides cf. cóllacteusT. topilensis

Pliocene

N.21

N.19

N.18

1-2, 100-102

14,100-102

2-2, 140-142

4-1, 100-102

44, 100-102

P

P

P PP P R

P P P

P C P RP

P

PC C C C

P PP PP P

P C

PP P CR P P

Late Mio.

N.17

N.16

5-2, 100-102

54,100-102

6-2,100-102

64, 100-102

7-2, 100-102

P

PP P

C P P P

P P P

P

•o is

13

13

C C C R P

C P

PC P C R PR P P P P

Mid. Mio.

N.15

N.14

N.9?

Early Miocene

N.5

74, 100-102

8-2, 100-102

9-2, 95-97

10-2,108-110

104,100-102

P R

P P

P

P P

+ c

PA P +

PP C +R P

N.4

Oligocene

P.22?

P.20?

P.19?

11-2,97-99

114,100-102

12-2, 104-106

14-1, 99-101

14-3, 100-102

P

R P R P +P

V A AC P

R

R

P P

P

a

cu

Mid. Eocene

α. cu i

15-2, 120-122

16-2, 53-55

17-2, 100-102

20-2, 100-102

204,91-93

RR

R P +

R

R RP C

P P

+

R

C +

P P

PC P

21-2,100-102

22-2, 93-95

224, 144-146

23-2,106-108

24-2, 102-104

+

+ I

cu2αi

' Early Eoc.

244,81-83

25-2, 104-106

26-2, 80-82

264, 81-83

29-2, 80-82

+

+

30-2,12-14

31-2,48-50

Late Eocene.

461


Globigerinoides quadrilobatus primordius Blow andBanner, 1962Globigerinoides quadrilobatus sacculifer (Brady, 1877)(ex Globigerina)Globigerinoides quadrilobatus trilobus (Reuss, 1850) (exGlobigerina)Globigerinoides ruber (d'Orbigny, 1839) (ex Globigerina)Globigerinoides sicanus de Stefani, 1952Globigerinoides subquadratus Brönnimann, 1954"Globigerinoides" tenellus Parker, 1958Globoquadrina altispira altispira (Cushman and Jarvis,1936) (ex Globigerina)Globoquadrina altispira globosa Bolli, 1957Globoquadrina binaiensis (Koch, 1935) (ex Globigerina)Globoquadrina conglomerata (Schwager, 1866) (exGlobigerina)Globoquadrina dehiscens advena Bermudez, 1959Globoquadrina dehiscens dehiscens (Chapman, Parr, andCollins, 1938) (ex Globorotalia)Globoquadrina dehiscens praedehiscens Blow and Ban-ner, 1962Globoquadrina galavisi (Bermudez, 1961) (ex Globi-gerina)Globoquadrina larmeui larmeui Akers, 1955Globoquadrina larmeui obesa Akers, 1955Globoquadrina pseudofoliata Parker, 1967Globoquadrina pseudovenezuelana (Blow and Banner,1962) (ex Globigerina)Globoquadrina sellii Borsetti, 1959Globoquadrina tripartita tapuriensis (Blow and Banner,1962) (ex Globigerina)Globoquadrina tripartita tripartita (Koch, 1926) (exGlobigerina)Globoquadrina venezuelana (Hedberg, 1937) (ex Globi-gerina)Globorotalia acostaensis Blow, 1959Globorotalia ampliapertura (Bolli, 1957) (ex Globigerina)Globorotalia birnageae Blow, 1959Globorotalia cerroazulensis pomeroli Toumarkine andBolli, 1970Globorotalia continuosa Blow, 1959Globorotalia crassaformis (Galloway and Wissler, 1927)(ex Globigerina)Globorotalia cultrata (d'Orbigny, 1826) (ex Rotalia)Globorotalia dutertrei (d'Orbigny, 1839) (ex Globigerina)Globorotalia fohsi fohsi Cushman and Ellisor, 1939Globorotalia fohsi lobata Bermudez, 1949Globorotalia humerosa Takayanagi and Saito, 1962Globorotalia inflata (d'Orbigny, 1839) (ex Globigerina)Globorotalia imitata Subbotina, 1953Globorotalia kugleri Bolli, 1957Globorotalia lenguaensis Bolli, 1957Globorotalia margaritae Bolli and Bermudez, 1965Globorotalia mendacis Blow, 1969Globorotalia merotumida Blow and Banner, 1965Globorotalia miozea cibaoensis Bermudez, 1949Globorotalia obesa Bolli, 1957Globorotalia opima nana Bolli, 1957Globorotalia opima opima Bolli, 1957Globorotalia peripheroacuta Blow and Banner, 1966Globorotalia peripheroronda Blow and Banner, 1966Globorotalia praemenardii archeomenardii Bolli, 1957

Globorotalia prasaepis (Blow, 1969) (ex Globigerina)Globorotalia pseudoampliapertura (Blow and Banner,1962) (ex Globigerina)Globorotalia pseudokugleri Blow, 1969Globorotalia scitula (Brady, 1882) (ex Pulvinulina)Globorotalia siakensis LeRoy, 1939Globorotalia tosaensis Takayanagi and Saito, 1962Globorotalia truncatulinoides (d'Orbigny, 1839) (exIRotalia)Globorotalia tumida plesiotumida Blow and Banner, 1965Globorotalia tumida tumida (Brady, 1377) (ex Pul-vinulina)Globorotalia ungulata Bermudez, 1961Globorotaloides hexagonus (Natland, 1839) (ex Globi-gerina)Globorotaloides suteri Bolli, 1957Globorotaloides variabilis Bolli, 1957Hantkenina alabamensis Cushman, 1925Morozovella aragonensis aragonensis (Nuttall, 1930) (exGloborotalia)Morozovella aragonensis caucasica (Glaessner, 1937) (exGloborotalia)Morozovella coronata Blow (MS: after Fleisher, 1974)Morozovella formosa formosa Bolli, 1957) (ex Globo-rotalia)Morozovella lehneri (Cushman and Jarvis, 1929) (exGloborotalia)Morozovella cf. perclara (Loeblich and Tappan, 1957)(ex Globorotalia)Orbulina suturalis Brönnimann, 1951Orbulina universa d'Orbigny, 1839Pseudohastigerina micra (Cole, 1927) (ex Nonion)Pulleniatina obliquiloculata (Parker and Jones, 1865) (exPullenia)Pulleniatina primalis Banner and Blow, 1967Pulleniatina spectabilis Parker, 1965Sphaeroidinella dehiscens Parker and Jones, 1865) (exSphaeroidiná)Sphaeroidinellopsis seminulina kochi (Caudri, 1934) (exGlobigerina)Sphaeroidinellopsis seminulina seminulina (Schwager,1866) (ex Globigerina)Sphaeroidinellopsis subdehiscens (Blow, 1959) (exSphaeroidinella)Subbotina angiporoides (Hornibrook, 1965) (ex Globi-gerina)Subbotina boweri (Bolli, 1957) (ex Globigerina)Subbotina gortanii gortanii (Borsetti, 1959) (ex Catapsy-drax)Subbotina gortanii praeturritilina (Blow and Banner,1962) (ex Globigerina)Subbotina linaperta (Finlay, 1939) (ex Globigerina)Subbotina winkleri (Bermudez, 1961) (ex Globigerina)Tenuitella anfracta (Parker, 1967) (ex Globorotalia)Tenuitella clemenciae (Bermudez, 1961) (ex Turbo-rotalia)Tenuitella gemma (Jenkins, 1966) (ex Globorotalia)Tenuitella praestainfohsi (Blow, 1969) (ex Globigerinita)Truncorotaloides pseudodubius (Bandy, 1949) (ex Globi-gerinoides)Truncorotaloides topilensis (Cushman, 1925) (ex Globi-gerina)

462


Age

Pleistocene

Pliocene

Miocene

<v<o

1

Middle

arly

UJ

Oligccene

α>

cen

oUJ

Late

<D

-α-αs:

>>

UJ

Paleocene

Planktonic

Foraminiferal Zones

N22

N21

N19 (N20)

N18

N17

N16

N15

N14

N13

N12

Ni l

N10

N9

N8

N7

N6

N5

N4

P22

P21

P20

P19

P18

P17

P16

P15

P14

P13

P12

Pll

P10

P9

P8

P7

P6

P5

P4

P3

P2

PI

Holes

315A

D1-3

π 5?

CD 6

D6-8

D 9

316

D i

] 37-4?

0 97-10?

D12?

317

D i

i

2

317B

—1

—

1-14

D "

i—

18-20

22-38

π 39-40

318

Dl-2—

1—

4-8

π 9 ?

1 10-12

Dl4

] 157-16?

LZ1 17?

] 207-22?

] 247-25?

726729730

D31

Figure 1. Cenozoic sediments cored on Leg 33. Only foraminifer-b earing cores are shown in the figure. Cores arerepresented by numbered rectangles; cores for which ages are indeterminable are not accompanied by rectangles.

463


Truncorotaloides cf. collacteus (Finlay, 1939) (ex Globo-rotaliá)Turborotalita humilis (Brady, 1884) (ex Truncatulina)Turborotalita pumilio (Parker, 1962) (ex Globorotalia)Zeauvigerina zealandica Finlay, 1939

RESULTS

Site 315 (lat 04°10.26'N, long 158°31.54'W, depth 4162m)

Only cores 1 to 9 from Hole 315A were examined.Traces of dissolution are more or less observed in allsamples, but none is strongly affected. In the samplefrom Section 1 of Core 6 the number of specimens ismeager due to difficulty in the maceration procedure. Astratigraphic break is suggested between Sections 1 and3 of Core 6. The uppermost occurrence of Globorotaliakugleri is marked in Section 3, while Section 1 is char-acterized by the lowermost occurrence of Globorotaliaperipheroronda and Sphaeroidinellopsis seminulinaseminulina. This break may include Zone N.5. Exceptfor Core 9, for which an Oligocene age is suggested, thestratigraphic sequence of Cores 1 through 8 representsthe Miocene (Zones N.4 to N.17).

Site 316 (lat 00°05.44'N, long 157°07.71'W, depth 4464m)

Twelve samples were examined from Cores 1 through17 at Site 316. A well-preserved assemblage of Pleisto-cene age (Zone N.22) occurs in Core 1. Heavy dissolu-tion characterizes the rest of the cores and a number ofspecies in these cores are judged to have been brought inthrough downhole contamination. The presence ofGloborotalia kugleri in Cores 3 and 4 suggests that theybelong in Zones P.22 to N.4. The Oligocene/Mioceneboundary is tentatively drawn between Cores 3 and 4.The very poor state of preservation in Cores 9 to 17makes age assignment very difficult. DiagnosticPaleogene species (Acarinina soldadoensis,Globanomalina pseudoscetula, and Globorotalia imitatá)are found in association with several Neogene forms inCore 10, but G. imitata is the only Paleogene form in theunderlying Core 12. Although the Paleocene/Eoceneboundary is provisionally placed between these levels,further investigation is needed for precise age deter-mination.

Site 317 (lat ll°00.09'S, long 162°15.78'W, depth 2625m)

Samples were examined from Holes 317 and 317B.Cores 1 and 2 of Hole 317 are assigned to the Pleistoceneand lower Miocene, respectively, Cores 1 through 40represent almost continuous coring in Hole 317B, andthey encompass a fairly complete sequence from thePleistocene to the middle Eocene. In comparison withcores from other sites of Leg 33, preservation ofspecimens is exceptionally good. Dissolution is not aspronounced, even in Eocene assemblages (Cores 32 to40). A trace of contamination is obvious at some levelswithin the Paleogene.

Core 1 of Hole 317 and Cores 1 and 2 (only the upperpart) of Hole 317B contain Pleistocene assemblage(Zone N.22). Because of the absence of Globorotalia

truncatulinoides, the Pliocene/Pleistocene (ZoneN.21/N.22) boundary is not clearly specified. However,an approximate boundary is estimated between Sections2 and 4 of Core 2, based on the lowermost occurrence of"Globigerinoides''' tenellus and the uppermost occur-rence of Globigerinoides quadrilobatus fistulosus near theN.21/N.22 boundary. The N.18/N.19 boundary, de-fined by the first occurrence of Sphaeroidinella de-hiscens lies between Cores 5 and 6. The Miocene/Plio-cene boundary is here placed at the level of the first oc-currence of Globorotalia tumida tumida (base of ZoneN.I8), although opinion on this placement is divided.Regarding this boundary, Berggren (1973) considersthat the extinction level of Globoquadrina dehiscens,together with G. tumida tumida appearance datum, is areliable indicator. In the present sequence, however, adistinct gap is recognized between these two datums; G.tumida tumida appears first in Core 6, while the last oc-currence of G. dehiscens is recorded in Core 8.

Cores 7 to 10 are referable to Zones N.I6 and N.17based on the initial appearance of Globigerinoides ex-tremus in Core 10 and those of Pulleniatina primalis andGloborotalia tumida plesiotumida in Core 8. The first oc-currence of Globigerina nepenthes may suggest that Core14 belongs in Zone N.14. Cores 11 through 14 are thusreferable to Zones N. 14 and N.I5. Core 16 is assigned toZones N.12 and N.13 on the basis of the limited oc-currence of Globorotalia fohsi lobata. The concurrenceof Globigerinoides sicanus and Globigerinatella insuetaand the absence of the orbulines in Cores 18 and 19 in-dicate that they represent Zone N.8. The boundarybetween the lower and middle Miocene is drawn at thetop of this zone. The N.6/N.7 boundary, which is in-dicated by the extinction of Catapsydrax unicavus un-icavus and C. dissimilis dissimilis, lies within Core 20.Although samples are not available to differentiateZones N.5 and N.6 in the cores from Site 317, theN.4/N.5 boundary is easily recognized as the level of thelast occurrence of Globorotalia kugleri, both in Holes317 (within Core 2) and 317B (between Cores 20 and22).

The Oligocene/Miocene (Zones P.22/N.4) boundaryis located between Cores 24 and 25, based upon the in-itial appearance of Globigerinoides quadrilobatus primor-dius. The Oligocene is represented by Cores 25 through35, and the Oligocene foraminiferal zones, P. 18 to P.22,are clearly defined in the present section. Cores 25through 28 are assigned to Zone P.22, the base of whichis placed just above the extinction level of Globorotaliaopima opima. Globorotalia galavisi and Globorotaliaprasaepis disappear within the lower part of this inter-val, and Globorotalia kugleri appears first in the upperpart. Cores 29 and 30 are referred to Zone P.21, basedon the co-occurrence of Globorotalia opima opima andGlobigerina angulisuturalis. The P.20/P.21 boundary ishere placed between the horizon of the first occurrenceof G. angulisuturalis and that of the last occurrence ofGloborotalia ampliapertura, which marks the top ofZone P.20. Catapsydrax unicavus unicavus, shown byBlow (1969) to make its initial appearance at theP.19/P.20 boundary, occurs in Core 32. Core 31 and theupper part of Core 32 (Section 2) are referred to ZoneP.20., and contain a characteristic fauna consisting of

464


species such as Cassigerinella chipolensis, Catapsydraxdissimilis ciperoensis, C. penis, C. unicavus unicavus,Globigerina angustiumbilicata, G. officinalis, Globo-quadrina galavisi, G. sellii, G. tripartita tripartita, Globo-rotalia ampliapertura, G. prasaepis, Globorotaloidessuteri, and Subbotina gortanii gortanii. The initialappearance of Globoquadrina sellii within the range of G.tripartita tapuriensis in Core 34 (though neither speciesis common) indicates that Cores 32 (only the lowerpart—Section 4) to 34 represent Zone P. 19. Globo-quadrina pseudovenezuelana, Pseudohastigerina micra,and Subbotina angiporoides have their uppermost occur-rences within these cores.

The Eocene/Oligocene (P.17/P.18) boundary isdrawn between Cores 35 and 37. Although the first oc-currence of Subbotina gortanii gortanii, which is sup-posed to occur at the P.16/P.17 boundary, is observed atthe same horizon, the presence of Cassigerinellachipolensis suggests that Core 35 is referable to ZoneP. 18. Section 2 of Core 36 represents probably ZoneP. 17, as indicated by the presence of Globigerinapraebulloides leroyi and the absence of a number ofspecies which characterizes the fauna of the underlyingZone P. 16. The interval of Section 4 of Core 36 throughCore 38 is assigned to Zones P. 15 and P. 16, based on theco-occurrence of Catapsydrax africanus, several speciesof Globigerinatheka, and Subbotina angiporoides. A largeamount of faunal contamination was noted in Section 2of Core 38, where numerous specimens of the Neogenespecies are found. The same type of downhole con-tamination was also observed in Core 29, Section 4, andCore 33, Section 2, although here it is less distinct. Cores9 and 40 are judged to belong to Zone P. 13 because ofthe co-occurrence of Globigerinatheka mexicana kugleri,Morozovella lehneri, and Truncorotaloides topilensis, andthe absence of Globoquadrina tripartita tripartita. Accor-dingly, a stratigraphic break equivalent to Zone P. 14 isestimated to occur between Cores 38 and 39, where themiddle/upper Eocene boundary is placed.

Site 318 (lat 14°49.63'S, long 146°51.51'W, depth 2659m)

Cores 1 through 31 represent discontinuous coring atSite 318, and include the sequence from lower Eocene toPliocene. Well-preserved upper Neogene assemblagesare present in Cores 1 to 8, but moderate dissolution isobvious in Oligocene to middle Miocene assemblages ofCores 9 to 16. Strong dissolution has affected theEocene assemblages of Cores 17 through 31, and insome cases foraminifers have been completely removed.

The Pliocene is represented by Cores 1 to 5, and theMiocene/Pliocene (N.17/N.18) boundary is placedbetween Cores 5 and 6 on the basis of the initialappearance of Globorotalia tumida tumida. No zonalsubdivision was possible for the Pliocene sectionbecause of lack of sufficient zonal indexes. Core 7 isplaced within Zone N.I7, based on the presence ofGloborotalia tumida plesiotumida in the lower section.

The boundary between Zones N.15/N.16 is drawnbetween Sections 2 and 4 of Core 7 based on the first oc-currence of Globigerinoides extremus in Section 2. Thepresence of Globigerina nepenthes may indicate thatCore 8 is referable to Zone N.I4. A poorly preservedassemblage is found in Core 9, and is questionably re-ferred to Zone N.9. The concurrence of Globigerinoidesquadrilobatus altiaperturus and Globoquadrina binaiensisin Core 10 indicates placement in Zone N.5.

The Oligocene/Miocene (P.22/N.4) boundary isplaced within Core 14, because the initial appearance ofGlobigerinoides quadrilobatus primordius is recorded inSection 1 of the core. Cores 11 through 14 (the upperpart only), referred to Zone N.4, include Globorotaliakugleri and G. mendacis in addition to the above-mentioned species. The Oligocene is represented byCores 14 (Section 3) through 16. Although somereworked fossils are contained in the assemblage, thelower part of Core 14 may belong to Zone P.22. Core 15is assigned to Zone P.20 on the basis of the co-occurrence of Catapsydrax unicavus primitivus and Cunicavus unicavus. Core 16 is provisionally assigned toZone P. 19, although all that can be said is that the coreis not younger than this zone.

The Eocene/Oligocene boundary is tentatively drawnbetween Cores 16 and 17. As already stated, age assign-ment is extremely difficult for the Eocene section at Site318 because of the strong effects of calcite dissolution.Moreover, many samples include reworked specimens.For these reasons, only a tentative age determination ismade based on the following criteria. Core 17 may beplaced within Zone P. 15, as suggested by the presence ofCatapsydrax africanus and Globigerinatheka mexicanamexicana. Although Core 20 is very poor in foram-inifera, it is referred to Zone P. 14, based on the assump-tion that Globigerinatheka senni and Morozovella lehnerimake their last occurrence at this level. In a similar way,Cores 21 and 22 (Section 2) are referred to Zone P. 13,based on the assumed uppermost occurrence of Globi-gerinatheka mexicana kugleri and Truncorotaloidestopilensis. The co-occurrence of A carinina soldadoensisand Morozovella formosa indicates that Core 31 isreferable to Zone P.7.

REFERENCESBerggren, W.A., 1973. The Pliocene time scale: calibration of

planktonic foraminiferal and calcareous nannoplanktonzones: Nature, v. 243, p. 391-397.

Blow, W.H., 1969. Late middle Eocene to Recent planktonicforaminiferal biostratigraphy: In Brönnimann, P. andRenz, H.H. (Eds), Plankt. Microfossils, Int. Conf. 1st,Pros.: Leiden (Brill), v. 1, p. 199-422.

Fleisher, R.L., 1974. Cenozoic planktonic foraminifera andbiostratigraphy, Arabian Sea Deep Sea EHlling Project,Leg 23. In Whitmarsh, R.B., Weser, O.E., Ross, D.A., etal., Initial Reports of the Deep Sea Drilling Project,Volume 23: Washington (U.S. Printing Office), p. 1001-1072.

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12. shore laboratory report on cenozoic …y. takayanagi, m. oda table 1 distribution of cenozoic...

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