'x

,

On the Paleo-ecological Investigation of the Fossil

Foraminiferal Fauna in the Miyazaki Group

' W. ith Degcription of New Species •. ' By Shigeo MURATA* (received' on 20 Nov. 1950)

Abstract :

In the HyUga Plain, Miyazaki Prefecture, there are the Miyazaki Group with

' various kindS of rock-facies, the lithological conditiQn of which has been made clear

. by the investigation of Mr. T. Sudd. The writer has tried to makeapalqo-ecological

analysis of the fossil foraminiferal fauna of the Miyazaki Group, to compare it with

the lithological conditiQn. As the result it became clear that the climatic condition

of the upper Miocene Miyazaki Group had been warmer than that of the Pliocene,

at least, in the Miyazaki Plain, and that the Plain had to be divided into two areas.

It must be noted that the genus Corclammiua has the ecological condition of the open

. sea only.

t INTRODUCTION

There are well developed formations with various kinds of rock-facies in the Hyaga Plain,

and its lithological condition has been made clear by the investigation of Mr. Sud6. Fortunately,

' many kinds 6f the fossil foraminiferal fauna, which varies considerably with rock-facies, are

included in edch formation. It is a well known fact that th.e kind of the recent foraminiferal

fauna indicates the ecological condition. Therefore, it is possible to decide the paleo-ecological

condition of these fossil foraminiferal fauna by comparing them with the well-known Iithological

condition of the Miyazaki Group. Should we be able to determine the paleo-ecological conditions

of the'fossil foraminiferal fauna, it would be applied to the determination 'of the geological

environment and ,stratigraphic correlation etc. of an unknown formation including these fauna. ' , The author has selected the Miyazaki Group as the favourable formations for this purpose,

then collected the fossil foraminiferal fauna during the years 1948-49; after that these fauna

were analysed paleo-ecologically, to compare them with the geological environment etc.

. As to the principle and the method used in this investigation, the author wishes to refer to ,

the paper by Mrs. U.Kitazaki and her collaborators.(') .

FOSSIL FORAMINIFERAL FAUNA OBTAINED IN THE MIYAZAKI GROUP y tt . The geology of the Hyaga Plain in Miyazaki Prefecture has been studied carefully by Mr.

T. Sud6C2) who has divided the Miyazaki Group Qf this district into the following four forma-

tions. (in descending order) : ' • . ' • " ' ' '

* Geological Department, KyashU Institute of Technology '

J 92

TaEVeia.b.ee.250UP [sadowara formation

' unconformity ? . ' ,. Kiyotake formationMiyazaki Group . Kuraoka formation (Miocene) '' Tsuma formation ,

-xwwA unconformitY Mesozoic (?)

According to the bad exposure, this•area is not always suitable, at any place, for odr ,

sampling, so the following routes shown in Fig. 1, were selected as the standard five sections.

And 112 samples were taken out of these sections indicated by letters ""a", ,"eb", ""c", "ed",

'

- sug,yaius:{:.llfi.!liliilllliilee".ol}-Årfiak4ii -

1 S- O. //tr.(;l;kVNNveiZi,"Z"is-Jutzft O`"Q'S..o..t.:./S;e"""b"o

MESOZ OIc ? •(ts"S Åq" / 1

/ z "x s{ s ,/GRililtiSi)Iliiup

( i Nxv!StEs.c t?g'{3Lk'N illflllllli -

N.... G XR-xyOesnU R kitagata

Yuifuooklhasht• ,V'NO I D,vtyAIAkt CtTy=

51 - LEGEND t u. .v{gv Å~

" ' kv/t!' NNÅrxXx ; SN.i} Il=I.loNt loko.

,

' Fig 1. Map showing the distribution of formations and

sampling sections. ' ' ' ' ' ' As a result of the micropaleontological investigation made by the authQr, following two

biozones were recognized in each section. (Se.e. Table ,1,2,3,4,and 5) ,

' ""a", the section along Uchinohae, Kurokita, Kiyotake, and Hong6. , -

Zonule 1 2

Assemblage'Rotaliaorabei-Eponiaescf..

praecLnctus

SigmoiZimaschZumbergeri--Uvigerinasubperegrina

Formationincluded KamihokitaandTsuma KuraokaandKiyotake

Characteristicforms

RotaZiaorabei,Eponi(lescf•Eipruecinctus,RectoboZivina'asanoi

SigmoiZinaschlunebergeriUvigerinasubperegrina--MartinottielgacÅícommunts

Population rich

"" b", the section along Yusumokihashi, Kuranaga, Tsubone, Ukida, and Kitagata.

Zonule

Assemblage

Formation included

Characteristic forms

Population

RotaZia }tabeL- RectobolwLna . asanoL

---- -- ---• - i - -m "r -- deE

Kamihokita "

MartLnottLelZa cf. cornnzums- Sigmoilina schlunzbergeri

IRotaZia yabei, Rectoboliviua asanoi

EponL'des cf. praecinctus., Textularia

'taLwanensls

rich

Tsuma, Kuraoka, and Kiyotake

MartinottieZZa cf. communis

Sigmoilina schlumbergeri

'Uvigerind subperegrina

rich

.

"" c" , the section along Hokkedake, Nagata, and Kiwaki. .

Zonule 1 2-.-.- TT....-

AssemblageNRotaZiatosaensis-RectoboZivina.asanoL --t

Sigmoilinaschlumbergeri

Formationincluded KamihokitaandTsuma' KuraokaandKiyotake•

CharacteristicRotaliatosaensis,RectoboZiviuaasamoi,SchenkieZlavictoriensisRotaliaorabei,Eponidescf.pruecinctus'

SignzoiZinaschZurnbergeri

Martinottiellacf.communis

Population riche

"ed", the section along Sugiy'asu, Tsuma, and Okadome.

Zonule 1 2

Martinottiellabraaoranatarakiensis' SigmoiZinaschlumbergeri

Formationincluded

Kamihokita Tsuma

'Characteristic

fotmMartimottiellabraaptanatarukiensis Sigmoilinaschlumbergeri'

Population 'rare rare

"" e", the section along Kawabaru and Takajo'. ' 'Zonule-

tt..ttttt

1

Assemblage Vaginulznatakaoensis-Martinottiellabraayanatarukiensis.

SigmoilinaschZumbergeri-Robulusca' Zcar

Formatiohin61uded KamihokitaJ

t-

Characteristic

forms

LVaginuZinatakaoensisMartinottiellabredyauatarukiensis

RobulusZimboszas

Sigmoiliuaschlumbergeri

Robuluscalcar''

Population rare rare

The important fossil foraminiferal fauna from each section in the' Miyazaki Group are shown.

'

PALEO-ECOLOGICAL CONSIDERATION OF THESE FOSSIL •

FORAMINIFERAL FAUNA

According to Mr. T. SudVo, there are two basins with different geological environments, and

these are separated byabank locating to the north of the section ""c". The one in the

northern-area has a geological environment of an inland sea type, shoWing an interesting

contrast with an open sea type in the southern area. This classification is also supported

by the undermentioned characteristics of the fossil foraminiferal fauna in this area. Namely,

these fossil foraminiferal fauna evidently indicate that there hre two dimensional changes ef the

geological environment in the Miyazaki Groupr In the southern area including the section ""a",

""b", and ""c", the peZagic and benthonic form are very common; and the benthonic form is

abundant in the shallow water type and rare in deep water type. Then it will be seen that

the fauna in this area belong to the littoral and neritic forms. On the contrary, the northern

area including the section C"d" and C"e" is very rare in the pelagic form and also in the

individual number of the benthonic form, which contains few arenaceous forms. Comparing the

. above distribution with that of the recent age, the author have concluded that, in the geological

age of the Miyazaki Group, this area had been an inland sea.

As has already been reported by the author,(3) the age of the Miyazaki Group, on the whole,

must be the upper Miocene.. In that report the age was determined by,the fossil foraminiferal

fauna including great deal of characteristic spec'ies of the Miocene ip Japan, i. e. Cptclammina

cf. canceZlata, C. incisa, Bigenerina nodosaria, B. reophacLfornzis, Pseudogauaryina ishikiensis,

Martinottiella cf. comneunis, Gtiesella schenki, SchenkielZa victoriensis, A]lonion pompi'lioides, Rectobo-

i Zivina asanoi,• Uvigerina subperegTina, Eponiaes cf. praecinctus, and HanzawaL'a tagaensis and,

several kinds of species in the Pliocen3 with few individual numbers, 'i. e. 'CZavuZina orabei

akiensis, Robulus costata nzulticostata, R. costata subdecorata, agemonedosaria sagamiensis,

Hanzawia nipponica, and Rotalia yabei. Furthermore, these fauna include the rnore predominarit

of individuals and species of the family Lagenidae, which are closely related to the living and

95

fossil species ar6und the Philippines and the Malay Islands,(4) showing a much similarity to

that of the South Sea Islands than that in the Pliocene Takanabe Group.(5) E,specially, in the

northern area, the proportion of the specific and individual numbers of the family Lageniaue

is more predominant than other families. . Therefore, it is true that the ""CassiauZina Province of the Pacific type" whicln Dr. Asano(6)

recognized only in the younger age than the Pliocene, was also recognized in the upper Miocene

Miyazaki Group. And this fact leads us to the conclusion that the climate in the Miocene

had beeh warmer than that in the Pliocene as far as in the Miyagaki area is concerned. Such

climatic condition will also be supported by the discovery of the following tropical or subtropical

species from the northem area with 'inland sea characteristics. The species are RobuZus costata

multicostata, R. costata subaecorata, R. aepressus, R. papiZZosa, PZanuZaria boso, and P..7'aponica.

It is very interesting that the genus CorcZammina, the characteristic genus of the Japanese -

Miocene, was not discovered in the northern area with an environment of the inland sea.

Conventionally, the genus CorcZammina were discovered from the marine facies of the Miocene,

Oliogocene, and Eocene in the Japanese Tertiary, in any area.C?) By these facts, the author

wants to show that the genus Corclamneina had an ecological condition to live only in the open

sea. After the investigation of the geological environment by means of the foraminiferal fauna,

the author discovered an example of so-called ""One Cycle of Sedimentation", in the southern

area of the Miyazaki Group. The author wishes to refer to another paper(8) by the author,

in which the detailed descriptions are given. And after the lithological investigation, it became

clear that rock-facies in the s6uthern area, became more muddy as we go to the north..

1. According to Norton, R. D.,(9) the ecological condition of the foramiriiferal fauna is affected

by the temperature, depth, sanility, and bottom matter in the water; but in the southem area,

the temperature, dePth, and sanility are supposed to be almost constant in the horizontal

direction. To know the paleo-ecolbgical condition of the foraminiferal fauna, the bottom matter

which has various characteristics in the s6uthern area should only be taken into consideration.

' In this area, therefore, these species such as MartinottielZa cf. communis, Rectoboliviua asanoi,

Clvigeriua subperegrina, Eponides cf. praecinctus, and Rotalia orabel would have a more sandy

facies habitat than these of Sigmoilina schZumbergeri and RotaZza tosaensis. .(See Table 1, 2,

'and 3) . ' '

CONCLUSION

As a result of the correlation of the fossil foraminiferal fauna to the geological environment

• of the Miyazaki Group, following facts are recognized: ' ' 1. ,The climatic condition of the upper Miocene Miyazaki Group will have been, on the

whole, wa.rmer than that bf the PIiocene, at least, in the HyUga Plain. And the HyUga Plain

is divided into two, the one .locating in the northern area with an inland sea type, and the

other in the southern area.having an open sea type with the littoral and neritie characteristics,

in which an example of so-called C"One Cycle of Sedimentation" was discovered.

'

c

i 96

2. In these foraminifeal fauna,. the species flourishing luxuriantly in the sandy facies are

following forms:

Martinottiella cÅí conemunis (d'Orbigny)

Rectobolzvina asanoz n. sp.

Uvigerzna smbperegrina Cushman and Kleinpell

Eponiaes cf. praecinctus (Karrer)

Rotalia yabei (Ishizaki)

Op the contrary, the following forms are in the muddy facies. .

, Sigmoiliua schZumbergeri Silvestri ' Rotalia tosaensis (Ishizaki) ny 3. It is very interesting that the genus Corclammina has the ecological.condition to live only

' in the open sea.

.

DESCRIPTION OF NEW SPECIES

Textularia oratsushiroerisis n. sp.

pl. 1, Text-figs. Ia, b. '. Test compressed, elongate, about twice as long as broad, tapering, periphery lobulated;

slightly inflated; suture depressed, often indistinct; wall very coarsely arenaceous, roughly

finished; aperture elongate at base of inner border of chamber. Length about 1 mm.

Holotype.-loc. no. MM-207; Iwasaka, Yatsushiro-mura, Higashimorogata-gun, Miyazaki

Prefecture. Lat. 320 2' 13" N., Long. 1310 17' 34" E. Kamihokita formation, Miocene.

' Occurrence. - Rare at the type locality.

Remarks. -- This form is easily distinguishable from any other species by a very coarsely

arenaceous test and the apertural view.

Rectobolivina asanoi n. sp.

pl. 1, Text-fig`s. 2a, b. •

Test elongate, compressed, straight or very straightly curved, elliptical in end view, chambers •

of the uniserial portion broader than high; surface marked by several rather widely separated,

well-developed costae, each extending nearly the length of the test, not affected by the sutures;

aperture typically with a short tubular neck and well-developed flaring lip. Length about .O.8 mm.

Holotype. --- loc. no. MM-210; Iwasaka, Yatsushiro-mura, Higashimorogata-gun, Miyazaki

Prefecture. Lat. 32 el' 45" N., Long. 1310 16' 7" E. Kamihokita formation, Miocene.

Occurrence. --- Very common in the Kamihokita formation. • ' ' Anoinaliua asamoi n. sp. . , tt pl. 1, Text-figs. 3a,b.

Test nearly symmetrical, umbilical region concave on both sides{ suture not at all depressed, '

about 9 to 12 chambers in the Iast formed volutions, periphery rounded; wal1 coarsely perfmmte;

aperture at the middle of the base of the peiiphery of the chamber. Diameter about O.5 mm.

97

' . ' Holotype.-loc. no. MM-245; 500m Southeast . . • of Fumoto, Mukasa-muar, Higashimorogata-gun, .,' .}g NIX.3SIijÅr Åqig:iz SÅr' Miyazaki Prefecture• Kuraoka formation, Miocene.

, . Ia, ": 2a .3a Occurrence• --- Rare in the Miyazaki Group. - Remarks. '- This form is easily distinguishable

CEkijiil' . !ruot:resa.ny other species by the character of the

• EXPLANATION OF PLATE I. ' ' Figs. Ia,b -- Textularia yatsushiroensis n. sp. X40 .Plate 1 Figs. 2a,b. - RectoboZivina asanoi n• sp• X 45

Figs. 3a,b. -- AnoinaZina asanoi n. sp. X 40

.

The author wishes to express his cordial thanks to Dr.. K. Asano, Assistant Professor of

the T6hoku University and Dr. T. Oinomikado, Chief Geologist of the Teikoku Oil Co., for

their kind advices and comments, and to Dr. T. Matsumoto and Ass. Prof. R. Toriyama in '

the KyashU University for their kind suggestions.

The expense for this study was defrayed by the scientific research fund granted to the author

from the Department of Education. ' Sigeo Murata

Kyttsha lnstitute of Technology. -20th, November, ].950.

REFERENCES

1. Kitazaki, U., Maruhashi, M., and Husezima, R. (1949) : Studies on the Foraminiferal

Fauna from the Boring Cores near Kasiwazaki Oil-Field, Niigata-Ken, Jap. Journ. Ceol. Geogr..

Vol. 21, Nos, 1--4, pp. 135--153.

2. Sud6, T. (1950): A Geo-historical Study of the Neogene Tertiary in the South-East

of Kyushu, Joum. (eol. Soc. Japan, Vol. 56, No, 656. p. 300.

tt 3. Murata, S. (1950) : On the Fossil Foraminiferal Fauna in the Miyazaki Group, Mineralogor ' and (leoZogy, (not yet published)

4. Cushman, J. A. (1921):•Foraminifera of the Philippine and Ajacent Seas, U. S. IVat. t Mus., Bull. 100, Vol. 4.

Yabe, H. and Asano, K. (1937) : Contributions to the Paleontology of the Tertiary Forma-

" tions of West Java. Part 1, Minute Foraminifera from the Neogene of the West Java, &i. Rep.,

T6hoha Inzp. Univ., Skindai, Japan, 2nd Sti}., Vol, 19, No. 1.

Asano, K. (1942): On Some Species of the Family AToaosariiaae found in the Tertiary

Formations of the Philippine Islands, Journ. Gleol. Soc. Japan, Vol. 49, No. 586, pp. 288--294.

' ' '

5. 0inomikado, T. (1941) : Pliocene Foraminifera from the K6-.onzi Formation in the

Takanabe Group, Journ. Gleol. Soc. Japan,, Vol. 48, No, 578, pp. 516-519.

6. Asano, K. (1937): On the Japanese Species of Cassiduliua, Jap. Joum. GleoZ. Gleogt.,

Vol. 16, Nos. 2---3, pp. I43---153. - 7. Asano, K. (1949) : On the•' Miocene Forms of CorcZamnziua from Japanese Oil-Field,

/ Journ. Geol. Soc. Japan, Vol. 55, •No. 640, pp.1-4• ' Murata, S. (1950) : On thg Discovery of the genus Corclanzmina from the Paleogene Tertiary

of Amakusa, Kyushu, Science, Vol. 20, No. 3, pp. 138---139.

' 8. Murata, S,' (1950): Ibid.

9. Norton, R. D. (1930): Ecologic Relations bf Some Foraminifera, Bull. Scn'pps. Inst.

0ceanogr. Vol. 2, No, 9. .

e

.

.

-

't

. --. j ' '

t- ' ' ' x .

'

tt t tt ' ' '. Table-1. Range Chart of Foraminifers from the Section ""a" ' . ' in the Miyazaki Group. .

t

Species .Formation •,•

Rotalia yabei (Ishizaki) "

Rectobolivina asanoi n. sp.

-tEponides cf. praecinctus (Karrer)

Hanzawaia japonica Asano .Nonion pompilioides (Fichtel & Moll)

Anomalina asanoi n. sp.

Robulus calcar (Linne)

'Rotalia takanabensis (Ishizaki) .

Vaginulina legumen elegans d'Orbigny

Schenkiella victoriensis (Cushman)

Rotalia tosaensis (Ishizaki) '

Boiivinita qnadrilatera (Schwager) "

. tfRobulus cf. iotus (Cushman)t

R. submamilligerus (Cushman)

SLI,g!ugl!iug-Ssl!}!!gubergg!joilinaschlumbergeriSilvestri

Pseudogaudryina ishl'kiensiis Asano

Cyclammina incisa (Stache)

l• ,.Uvigerina subperegrina Cushman & ,Kleinpell

'G6esella- schenki Asano " 'Martinottiella cf. communis (d'Orbigny)

Haplophragmoides sp. ,

• Cyclammina' cÅí cancellata Brady

Vaginulina takaoensis Ishizaki

Bulimina marginata d'Orbigny• .

' ttt 'Nonion japonicum Asano

Bigenerina reophaciformis Ishizaki

Pelagic

Kamihokita Tsuma Kuraoka

ee

-- ee"

e--- '

e e eD t--p

tt

-- e-v e

Kiyotake

t

-e'

'

'

e"e

.

e

-- -e

et.

e

1 tt , t• e. 1OO

' i Table 2. Range Chart of Foraminifers from 'the Section t"b" •

' in the Miyazaki Group. Formation

Species . • . /'Rotalia yabei (Ishizaki)

Rectobolivina asanoi n. sp.

Eponides cf. praecinctus (Karrer)

Textularia taiwanensis Nakamura

Hanzawaia ta aensis Asano

Textularia agglutinans d'Orbigny

Clavulina yabei akiensis Asano

Textularia hosonoi Ishizaki

Robulus limbosus (Reuss)

Rotalia tosaensis (Ishizaki)

Martinottiella cf. communis (d'Orbigny)

G6esella Schenki Asano

Sigmoilina schlumbergeri Silvestri

Uvigerina subperegrina Cushman & Kleinpell

Haplophragmoides sp.

Anomalina asanoi n. sp.

Cyclammina cÅí cancellata Brady

C. incisa (Stache)LagenonQdosaria scalaris (Batsch)

Vaginulina takaoensis Ishizaki

Rotalia takanabensis (Ishizaki)

Schenkiella victoriensis' (Cushman)

Pelagic

Kamihokita Tsuma Kuraoka Kiyotake

e-eee

e-

ev e-ee

-t) -e -- -p

--b --P - -

qp eeO

-eee

.

e-

e-e-

glp -1-eee- e- ee e--

-d -) -

- - - -- -nyp -

---pe

.

/

L

.

e

'

c

-l

t

'' 101

' 'Table 3. Range Chart of Foraminifers from the Section ""c"

in the Miyazaki Group.

Formation Kamihokita Tsuma KuraQkaKiyotake

e----)-

--m---eJ-p-eqee'

'

Schenkiellavictoriensis(Cushman)

Bolivinitaquadriliatera(Schwager).

Robuluslimbosus(Reuss) '-pe--

Rotaliatakanabensis (Ishizaki)

MartinottiellabradyanatarukiensisAsano

'HanzawaianipponicaAsano

NonionjaponicumAsano

PseudogaudryinaishikiensisAsano

'SigmoilinaSilvestri

-.-schlumbergeri

Rotaliayabei(Ishizaki)'LEponidescf.praecinctus(Karrer)

e-e

-epeqpL.

'Quinqueloculinalamarckianad`Orbigny

e-e

/ts

tt

Textulariayatsushiroensisn.sp.

--)-elP

'

Martinottiellacf.communis(d'Orbigny)

Cyclamminacf.cancellataBrady

DentalinasolutaReuss

Buliminamar'd'Orbignyglnata

ic

-ep-eM-m---t--"---e

Pelag'

..H

t tt l tt / t tt ' ' /t ' ' ' . -i : ... ' .t t ' tt j - ..x. ! . nyA ' / /ttt

Teble 4. Range Chart Qf Foram.inifers from the Section ""d" •

's . ,, , in the Miyazaki Group. s

' ' FormationSpecies

Rotalia yabei (Ishizaki) "'Robulus ealcar (Linne) .

Martinottiella bradyana tarukiensis' Asano

Dentalina communis d'Orbigny

Robulus costata multicostata (Cushman)

R. costata subdecorata (Cushman)

R. depressus Asano

N'onion j ' m Asano

Eponides cÅí g-ram.ecinctus (Karrer)

Vaginulina takaoensis Ishizaki

Lagenonodosaria scalaris (Batsch)

Sigrnoilina schlumbergeri Silvestri

Rotalia takanabensis (Ishiz'aki)

Quingueloculina vulgaris d' Orbigny

Rotalia tosaensis (Ishizaki)

Pseudogaudrina ishikiensis Asano

Pelagic -

Karpihokita . . Tsuma

-ee

e- -tp --- -- en, e

e tee e- -- --- -j -- e-D -,e

-'-- - t-e e--- -- e--

'-t-)- --- - -) --- d-- --- -

-eee-e -- -- --p ----

1os

Table 5. Range Chart of Foraminifers from the Section ""e"

in the Miyazaki Gr6up.

'

'' , . FormationSpecies • . '

Martinottiella bradyana tarukiensis Asano

Sigmoilina schlumbergeri Silvestri

Vagin,ulina takaoensis Ishizaki

Robulus limbosus (Reuss)

R. calcar (Linne)

R. 'depressus Asano

Nonion japonicum Asano

Hanzawaia tagaensis Asano . 'Uvigerina subperegrina Cushman & Kleinpell

Bulimina 'marginata d'Orbigny

''

'Gaudryinella japonica Asano

Rotalia takanabensis (Ishizaki) .

Pelagic -

Kamihokita. '-

.et .Tsuma

.

e-ee

eg e-e

-),

d-P -.e - --e

.

.

'

-

'N

.

--

(t

104

Table 6. Important Fossil Foraminiferai Fauna from Each Section

in the Miyazaki Group.

SectionSpecies a b c d e

CyclamminacÅícancellataBrady

C.incisa(Stache)Haplophragmoidessp.

Textulariaagglutinansd'Orbigny

T.hosoRoilshizakiT.taiwanensislshizakiT.yatsushiroensisn.sp..

Bigenerinanodosariad'OrbignyB.reophaciformislshizaki'

PseudogL{gt!flt!xldnaishikiensisAsano

GaudryinellajaponicaAsano

ClavulinayabeiakiensisIshizaki

MartinottiellabradyanatarukiensisAsano

M.cf.communis(d'Orbigny)G6esellaschenkiAsano'Schenkiellavictoriensis(Cushman)

Quinqueloculinavulgarisd'Orbigny

Sk,gmoilinaschlum-bme!g/g!,l'i.Silvgstri

Robuluscalcar(Linne)

R.costatamulticostata(Cushman)R.costatasubdecorata(Cushman)R.depressusAsanoR.cf.iotus(Cushman)-R.'limbosus(Pteuss)

R.papillosa(Fichtel&Moll)PIanulariabosoAsano

P.japonica(Asano)Dentalinaso!utaReuss

Lagenonodosari.asagamiensisAsano

NopionjaponicumAsano

N.pompilioides(Fichtel&Moll)Bolivinitaguadrilatera(Schwager)

Buliminamarginatad'Orbigny

Rectobolivina,asanoin.sp.Uvigerinasubpe.hregrinaCushman&Kleinpell.Gyroidinaoi•:')ic'ularisd'Orbigny

Eponidescf.praecinctus(Karrer)-RotaliatakancgJl•)ensis(Ishizaki)

R.tosaen.gis(Ishizaki)R.yabeiÅqIshizaki)Anomalinaasqnoin.sp.

HanzawaianiT,)penicaAsanoHtagaensisAsano-nvt.t.tPelagic

-)ÅrÅqilÅrÅqÅ~Å~X'Å~)ÅrÅq•Å~Å~Å~Å~XÅ~Å~Å~Å~Å~Å~