a 1t"-I;-±~~~ ­~*·ic.t
Transactions and Proceedingsof tbePalaeontological Society of Japan
IIg *1] 15 ~~ 18 iJJr.

19 40

No. 18(itl!. ~~*I~t$ 47 ~ 1it 560-563 9!1l' tt.lillj)[Rep~inted from Jour. Ge;;i. Soc. J apan, Vol. 47. ·Nos. 560-563.]

Palaeontological Societyof J apan

;J(

CONTENTS'* Transactions
105. Takumi NAGAO, An OcculTence of Pn,est'J"iftptvchus? ill the Upper Jurassic ofJ apan (Published l\[ay 20) . .. . . . .. .. .. .. . .... .. .......... . .... .... .... ... ;.c.... ....
*~'1LI::f$106.

v = 7 mEE Praestl'iaptychus G~ I~) (5 fj 20 EHiit~) .. .. .......... :Ii:

If!,

'Pj

33
36

Manziro NAKAMURA, An Interesting P ecten hom the Nanakita B eds, Nenosiroisimura, Miyagi-gun, Miyagi-ken (Published June 20) . ...... .... .. . ....... . . . . . . ... ..
-g~~;tit) B;Q"t4"ili:f~ -I::~t.lIllEi'ilIiO)~)!..:V.Jt1t;Q"0) 1 Wr:tmf'Ci',XIt'L O~~) <;6 fj

37

20 E~~) .. . .

.. .. .. .. .. .. .. .. . . .. .. . . .. .. .. .. .. .. . . .. .. .. .. .. .. .. . .. . .. .. . . .. .. .. .. .. 'f' *I' ;!it

* RII 38

107. Kotora M. HATA! lmd ManziI'D NAKMlIUM, On Some Fossils fl'om the Hukau.r a
Beds Nisi-Tugaru District, Aomori Prefecture, Northeast Hon. ·yG (Publi shed July20) . ...... . . . . . . .... .. . . .. .. . . ... . . . . . . . . . .... . ..... ... . .... . .... . ... ...... .. .. . ... . .

39llfillfJltH§iiIt;Ii!il!llIIr?f<tiIi/l)}ilt1t;Q" 2,3 i'C;\iK It' L (mi ~) ( 7 fj 20 E ~~) . . ;l!I)

42,n I j , JJ?. 9=' ;ji ;!it * R~

108. JB.rBlF.Elmlli:~O)~=~:f=i:rLili'MtiEi F::::tt-C (8 ~ 20 E! g:~O .. .............. :k. ~1AlJrH;!i! lI1ll
Tuneteru OlN01!IKADO, Tertiary Foraminifera from the Amaze Oil Field (ResuDle)(Published August 20)· ..... ... . . . . .. . . . ... . .... . ..... . . '.' . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

=109. ~~",*rfc:~Ji!.~nt-.: 2 ~1\1i1tiEiyc:;ilt-c (8 ~ 20 B ~3'O .... · .. .. .. ·: .... · t1i ::It ~Fuyuji TAKAl, On Two Teeth of El ephants foun d in Niigata Prefecture (Resume)(Published August 20)·· . . .. ... . " . .. ..... " " " " ... . " " ' .... . " " : .. .... . " . ... ... . . .

.~~Proceedings· . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

43
49
51

54

55

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R eprinted from J our. ·Geol. Soc . J " l"'ll, Vol. XLVII, No . ~6q , i\Iny 20th, ]910

105.

An Occurrence of Praestriaptychus? in tlze
Upper Jurassic of Japan
By

Takumi NAGAO(Read February 18tll, 1939; r eceived April 5th, 1940)

Aptychi seem to be extr mely rare in the Japanese Jurassic, Co?'naptych'l.ts
na,qatoensis NAGAO l ) from the L ias of the province of Nagato being the unique exampl e hitherto recorded. R ecently Prof. H . YABE of the I n stitute of Geology andPalaeontology, TO.hoku I mperial Univer ,'ity, kindly submitted for determination to
the writer an aptychus obtained from the Upper Jurassic rock s in the souther npart of the Kitakami Mountainland in . Northern Honsyu. The specimen is, asde 'cribed b low, represented by a ca, t of a two-valvcd operculum with the ornamentat.ion of either outer or inner surface impressed on the matrix. The parent ammonite is unknown at ' present. I n the district where this operculum has 'beenobtained, the Upper J'u rassic rocksZ) composed mainly of dark coloured hard slaty
shale alternated with , andstone are developed. On t he label sent to the writer
together with the specimen is recorded that it had been found at a locality with,separately, a specimen of Pe?'isphinctes (A'l.tlacosphinctes?) sp. No ammonite of othergenera is yet reported to occur in thi, complex, it will be ver y natural to sUppo 'et hat this oper culum belongs to some form of this genus.

Pmest?'iaptych'l.ts ? sp.
"

Type specimen: A cast impressed on dark coloured slaty shale.
Locality and horizon : Tomari, Ohara-mura, Ozika-gun, Miyagi Prefecture ; 3)'Ozumi bed,4l
A ptychus c~mposed . of two valves joined along the ' straight harmonic margin,.height smaller than twice t he maximum breadth; valve semi-oval hl outli~e with
1) T. NAGAO : Comaptyclms from th e JUr assic of Japan, Proc. Imp. Acad., VII, no. 10, 1932, P.
511, text-figs. 1- 3. This for m has b een considered by Prof. TRAUTH as a vari ety of C: stenohythensis
TRAUTH. (F. TRAUTH: Di e zweivalirge.n Apty ch en des Lias, Part I, 1935, PI. VI, fig. 17; Pt. II, 1936,
pooH. P l. II, fig. 1.).
2) T . TAKAFfASI: On th e Mesozoic P lant·bearing Depos its of Ozika Peninsula, Miyagi Pl:efecture,. .J ubilee Publ. Comm. Prof. H. YABE, Six t ieth Birtl1d. Vol. II (in Preparation).

3) '&:!rkWl:!£j:Jlll:!IlfI:;i()JjftHs
4)

IJ,fJ(/ITf
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216

Takumi NAGAO

the maximum breadth near the apex, and thence gradually narrowing .tol'lrard theexternal end. Lateral margin arcuate, passing gradually into the external one andabruptly, over the narrowly rounded umbonal angle, into the nearly straight andrather long iliternal margin which form s an obtuse angle with the symphysial
margin; outer margin incomplete but apparently very short and convex.
Outer surface of the specimen very weak ly convex both from the inner margin. to the outer and from the lateral mat-gin to the symphysial, ornamented withcrowded, round-topped, nither broad, more or less elevated concentric ribs (or fold s}
parallel with the margins, .and concave interspaces in alternation; the ribs moreelevated and narrower on the earlier stage, becoming broader, lower and more
cro'wded toward the margins where the inter space' are narrower than the ribs themselves. Close-set, very fine concentric striations (growth-lilles) cover the ribs andinterspaces.. Adsymphysial area not well defined, k eel not well developed.
Measurements of left valve, as preserved.
Maximum h eight . '.. . .. . . ...... ca. 34 mm.
Length of harmonic line " .... ca. 27 mm.
Maximum breadth ..... .. ..... ca. 19 mm .
In the present specimen the impression of both valves is represented, but the-34 -

An Occllrn'nce of Pmestl'iaptychus? in the Upper Jurassic of J apan

.

217

.

out line of one of th e valves is much obliterated o'wing to secOJidary deformation .
T he opposite valve itself has been subjected to some tor sion, so as to be lengthened
a little along the line connecting t he umbilical angle with the ter m inal one. The
original contour of th e left valve may have been sligh tly m ore broadly semi-oval
wit h th e lateral margin m ore broadly convex.
In the present sta te of preservation, especia lly since the outer mou ld on whichth exter nal ornamentation may IJave been clearly im pressed was not collected, it isvory difficult to determine wh ther the concentric or namentation sh own on th e
convex .'urfaee of th o specimen belongs to the internal or concave surface of t hevalves or the external or convex one. Until this is . ettled th e features of th e
oper culum under consideration can not be r econstru cted wit h certainty to place
thi Spl imen safely u nder any of the determined types or forms.
The calcareous layer does not remain in the specimen, but th e valves are pr esumably very thin; from this feature together e with tho ch aracteristic concen tric
ornamentation, a lth ough it is not deter mined whether the latter is the ex ter nal or
int rnal, the present operculum most pi"obably belong.· to.' St?'iaptyclms in t he broad
se'nse1l as defined by Pr of. F. TRAu'I.'H, which includes Pmest?'iaptych~6s,2l Gmnulaptycht6S3 ) and S t1'iaptychus (s. str .).4l These th ree "subtypes " have m any featuresin common , especially a thin calcareous layer and concentric ribs or folds.
Some fhisp hinctes. have been determined with some certainty to' bear Gmnulaptyc h~6S . This type of oper cula, with its range from Dogger to MaIm , ~s characterisedin having the inner concave surface concentr ically scu lptllTed . and the outer convex surface or nam ented rather irregu lar ly with granules or stock s.
I n t he present specimen no -trace of granular or namentation is preserved . If
the pr served or namentation is derived from the convex surface of the origrnaL
aptychus, then this oper cu lu m can not be a Gmn16aptychus, while if th e ornamen tation i. ' attributable to the concave surface of th e valve, t hat is to say the specimen
at h and is the inner mould, thi s oper culum may belong to any of the three" subtypes " cited above. Thus oper culum may be G'r ant6l aptych~6s which has been
known to belong to some for m ' of Pe?'i sp hinctes as above mention ed.
On the other hand, from the presumable th in test of th e valves, it seems
advisable to consider the present specimen as represen ting the exter nal ornamentation t hat is t h e ex ternal "cast " impressed on the inter nal " mould," a ver ycommon case of many thin-texted specimens of Perisphin ctes met with in this district and other parts of Japan. H ence, it is not deniabl that we are treating an
oper cu lum of. Pmest?'iaptycht6S. T his type of opercu lum remained long unknown
from th e Upper Jurassic and it was though t that in t he history of S t?"iaptychus(s. lat. ) a greeat g~p had intervened between the, Dogger from which imperfectly
k nown FTaest?'iaptycht6s are met with and the Upper Cretaceous dominated by
1)
2)
3)
4)

F. T R AU T H : Aptychenstudien V, 1930, Die Ap tycb eu des Dogger, p . 379. 'F . TRAU TH: Ibid., p, 378.
F. TRAU TH : Ibid., p. 387.
F . T R AU TH : Aptych = tw.lien II, 1928, Die Aptychen d el' Ob rkreide, p. 134,
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•

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218

Takumi NAGAO

St1"i.aptyc h~Ls (S. str.) .

Lately T RAUTHl ) demonstrated that Praestriaptych i occurred in the Upper
Jurassic. From the Upper Jurassic of vVuttenburg is k nown a P?"a est?'iaptyc h~Ls
which was fou nd in a sh ell of Pe1'isphinctes and TRAUTH named it P1'aest1'ip tyc h~Ls
jmasi TRAUTH. The oper c:ulum from Japan seems to be akin to this form of P'i'CLest1'iaptychus, especially to th e specimen illustrated by TRAUTH in pI. X , fig . 5,2).although a more precise comparison is prevented owing to the very im perfect stateof the Japanese fossil.
. At the end the writer wishes to express his t hanks to P rof. YABE for th o loan-of the present specimen.

*~fl::l -"- 7 *B/N K f'J: aptychus ri;fl.l!<\:) -C ~ (/~ Comaptychus nagato~'1ls'is NAGAO (:6[: 1'97 1 7;;<. INffO ;;j, ?;Ob;!1- -C C'.;) ~ l'Cif.\l ~·tJ: 11'0 A,1E!lJl:[:ltW**'ff!1~1~0)1ajJ~f~gK J: ~ ~G.J:: p.};j'l\{I .J:: 1\'{I::l -"- 7 IN1tWrjlt I±\ 0)

aptychus a:~

L-~1;:o L;!1-a:JlEL-1dtll. "t"f'J: PM·isph·inctes ( Aulacosphinctes?) "p. ;;j,:(!f-M~~ ;!1-1;:0)#"t", 'Ift-C L 0) apt,yebus't L 0)Wi'lcl)7 "Y'E:J- 1 I, 0) t cl) c ~""-~o ;;j~~* a:;f:iT ~ i TRAUTH 0) St1'iaptychus (s. 1.) "t"ih-::::>-C, ~7i'O:§t"t"ih{,1tX;!1-W.J::cl)L. Cf'J:~!lf1"t"ih{,;;j' .

Ch-anulaptychus c\t'~J: ~ t~b Pm eiltr'iaptyclm~ "t"t,J.II';;j>c.I!'-"s, oPraeilt1'iaptychus ('l r:p{;-[l::l "- 7 J: ~ .J::1\'-[1 E! 1iHBK ~ ~ :6[:Jl1J flfJ ;;j> b f'J:'Ift*li'riiKr,n;!1- -C C'.;) tJ: "/;>-::::>1;: 0\",0>U/kj![ TRAUTH f'J:.J::'ff!I::I "'-7 J: ~ jlt I±l T{,~19]a:tlil:: , if.'fK W littenburg.J::{;-[I::I,,-7!0- J: ~ f'J: Pe1'isplvin-ctes 0) mt if· K A. -::::> -C C'.;) {'17tl a: ih if -C J;; ~ 0 C:;!1- vl P raeBt'r iaptychus ,jmas·i TRAUTH

c -fr;-.f:, ~ ;!1- tc ;;j{, ;;J>4flil\'icl) t

0) f'J: Z ;!1-l'dliJl.1tl L- -C C'.;) ~ 0\

1) F. TRAUTH:

Ap t ychenstlld ien V, 1930, Di e Ap tycben (les Dogger. p. 379.
2) F. TRAU1'H: Die P raestrinp tyehi und Granul a pf.ychi des Oberjul'a nnd : del' Untel'krei de.
palaeon t. Zei t.schr., va}. XIX, 'l. 937, . p . 138. pI. X, figs. 1- 7; pI. XI, :fig. 1.
-

.

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36 -

R eprinted from J om . .Geol. Soc. Japan, Vol. XLVII, No. 56~, May 20th, ] 910

105.

An Occurrence of Praestriaptychits? tn theUpper Jurassic of Japan
By

Takumi NAGAO(Read Febr uary 18th, 1939; received April 5tb, 1940)

Aptychi seem to be extremely rare in the Japanese Jurassic, Co?'naptychusna,gatoensis NAGAd) from the L ias of the province of Nagato' being the unique ex.ample hit.herto r ecorded. R ec ntly Prof. H. Y ABE of the I nstitute of Geology andPalaeontology, T oh ok u I mperial University, kindly submitted for determination to
the writer an aptychus obtained from the Upper Jurassic rocks in t he southernpart of th e Kitakami Mountainland in . Northern Honsyu. Th e specimen is, as·described below, represented by a cast of a two-valved op rculum with the ornamentation of either outer or inner ,'urface impressed on the matrix. T he parent ammonite is unknown at ' present. In the district wher e this operculum has beenobtained, th e U pper Jurassic rocks2) composed mainly of dark coloured hard slaty
sh ale alternated with sandstone are developed. On the label sent to the writer
together with t he specimen is record d that it had been found a t a locality with,separately, a specimen of Pe?'isphinctes (A~(, lacosphinctes?) sp. No ammonite of oth er
genera is yet r epor ted to occur in t his complex, it will be very natural to supposet hat this oper culum belongs to some form of this genus.
P7'CGest?'iap tych~(,s ? sp.

Type specimen : A cast impressed on dark coloured slaty shale.
L ocality and h orizon : T omari, Oh ara-mum, Ozika-gun, Miyagi Prefectur e ;3)'Ozumi bed!'
Aptych us compo,ed . of two valves joined along the straight h aimonic margin,ll eigh t smaller than twice t he maximum breadth ; valve semi-oval in outline with
1) T. NAG ,iQ : C01'naptychus from t he J Ul"sssic of Japan, Proc. Imp. Acad., VII, no. 10, 1932, P'511, text-figs. 1-3. This form bas b een considered by Prof. TRAUTH as a variety of C: stenohythens~
TRAUTH. (F. TRAUTH : . Die zweivalirgl'll Aptychen ell'S Lias, Part I, 1935, Pl. VI, fig. 17; Pt. II, 1936,
p .. 14, P l. II, fig. 1.).
2) T. TAKARA-S1: On tbe Mesozo i.c Plant-bearing Deposits of Ozika P eni nsu la, Mi yagi P l:efecture,. .J ubilee Publ. Comm. Prof. H. YABE, Six t ieth Birthel. VoL II (in P r eparation).

3)-g:!J£~\~4i)l'[!!lII :l\.JJiftJ"iB

4),HJtlilf
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33 -

216

Takumi NAGAO

the maximum breadth near th o apex, and th ence gradua lly narrowing .toward theexternal end. Lateral margin arcuate, passing gradually into the exter nal one andabruptly, over th e narrowly rounded 11 m bonal angle, into th e near ly straight andr ather long internal margin which forms an obtuse angle with the symphysial
m argin; outer margin incomp lete but apparently very sh ort and convex.
Outer surface of the : pecimen ver y weakly convex both from th e inner margin· to th e outer and from th e lateral mal'gin t o the symphysial, ornamented with. crowded, round-topped, rath er broad, more or less levated concentric ribs (or fo lds)
p arallel with the margins, .and concave inter spaces in alternation; the l'ibs mor eelevated and narrower on the earlier stage, becoming broader, lower and m ore
crowded toward the margins where the inter spaces are narrower than the ribs them selves. Close-set, very fin concentric striation,' (growth -lines) cover the ribs andinter spaces.. Adsymphysial area not well defined, k eel not well developed.
Measurements of ~eft valve, as preserved .
Maximum hBigh t . .. . . . . . . .. . .. . ca. 34 mm .
Length of har monic line . .... . ca. 27 mm.
Maximum breadth . . . ..... . .. . ca. 19 mm .
I n the presen t specimen the impression of both valves is r epresented, but th e-

34 -HepriDtec1 frolU J our. Goal. Soc. J apau, Vol. XLVII, No. 561, JULIe 20th, ]940

106. . A n In ter esting Pecten from the Nanakita Beds,
Nenosiroisi-mura , M iyagi-gun, M iyagi-ken
By
Manziro NAKAMURA(Read and received April 27tb, 1040)

The present specimen was collected by the writer from the southern sjope of
Doniwayama, Nenosiroisi-mura, MiY\lgi-gunll. Although r epresented by ouly asingle cast; it appears to b6J new to science and is given the following name andd escription.

Pecten (Swijtopecten ) nanalcitaensi s, n. p .
. A s ingl e rig bt va lve. Shell mther sma ll in size, measuring 41m111 In altitude, 38.5 mm
in breadth, about 7mm in depth a na: about 85° in apical angle.
Valve compressed, broadly pear-shaped, sculptured with about
either prominent ribs; posterior ear broken . Ribs eig ht ill
number, rotmdly el evat ed, abou t equal t o its inter spaces anteriorly, its backs and sides l)r ovidecl with about 5 r a dia lthreads, which a r e marked only on the an ~eriol' half of shell,
posteriorly becoming weaker and a t apical r egion altogethel'obliterated ; interspaces of main r ibs p r ovided with 3- 4 radial
threads which ext end p ost eriorly to only half of shell l ength.
Main ribs much broa der than th eir shallow int erspaces a t a picall'egiol1, g radually becomin g n early equ al to the iuterspaces inbi'eaclth anteriorly, a nd a t anteriormost ma rgin, n early eqtl al.
Posterior slop e of shell provided with severa l weak r a dial
Text-fig. I, P ecten nana/;ithreads, the anterior slop e also provided with a fe w, whichxltaens·i s n. sp.
a re neal']Y obsolete. Hinge-line short, posterior ear broken,
the auteriol' one short, provided ,:vith a f ew threads. Inter ior f eatures u nkllown , .
Localit y.;- Doniwayama, Nenosiroisi-mura, lVIiyagi- gun, Miyagi-ken. Reg. No. 61334.
HO,r izon :--Lower part of the Nanakita beds.

Compared with Pecten c?'assiveni1~? Y OK OY AMA2>, a Miocene sh ell from near
Nanao, Kasima-gun , I sikawa-ken, the present one has a smaller sh ell, fewer number of radial ribs, and the Eculptlll'e of the ribs are entirely differe nt. YOKOYAMA' S
1) M. NAKA~[Ula: Remarks on Oertain Pecti.nidae Fossils from the 'l'o llliy'~ Block, Miyagi-ken,
J ap. JOUl'. Geol. , Geogr., Vol. 17, No. 1-2, pp. 1- 15,2 pls., 1940.
2) lVI. YOKOYAMA: Pliocep e Shells from near Nunao, Joto, I m p, Geol. Sur\" Japan, Rep. "0. 104,
p. 6, pI. 6, fig, 1, 1929.
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264

Manziro NAKAMURA,
species is provided with ribs which are trichotomous and coarsely scaly, while thepresent one lacks the scaly sculpture.
Compared with Pecten (Swijtopecten) swijtii BERNARDI, figured by GRAN'!.' aud
GALEl ) (including the forms pa?'rneleei DALL, wattsi ARNOLD and kindlei DALL,
also figured by ·GRAl"T and ' GALE in the same work), the present one has moredelicate sculpture Qn the ears, a less number of much weaker radial threads, ag reater number of promi.nent ribs, a smaller shell, and .smaller ears. 'Compared with Pecten hastc~tus stmtegus DUL, figured by Am:wLD2) from the
Pliocene of Santa Barbara , Californi.a, the present oIie has a less number of radial. ribs, less orbicular sh elL outline, less prominent radial threads at the anterior halfof the sh ell, and weaker sculpture on the posterior half of the shell . .
. Some varietal forms of Pecten cosibe?isis YOKOYAMA") and P. h e te?' oglyp l~~s
YOKOYAMA,j) also somewh at resemble the present one, but the ch aracters of sculpturer eadily remove the present one from YOKOYAMA'S species.
Pecten (Swijtopecten?) ot~~t~~miensis NONJURA and HA'!.'AI") from the Otutumi
beds of the Tomiya Block in Miyagi-keu, somewhat resembles the present species,
but the main ribs in that species bifurcate and th ey' are ,aid to be · imbricated,while in the present one the ribs do not bifUi'cate and the whole surface 'is not
imbricated as in that species.
At this place the writer wishes to thank Prof. ' H. Y ABE for ,kindly giving
him permission to submit this article for publication. He also extends his thanks
to Dr. S. NOMURA and Mr. K. II.<\TAI for thei r suggestions and help during the
preparation of this article.

~='lfr:t~K 'g:!ljllJ~&;;1't-:lII!.!JI!, J: Vil/i-t {) $)l..ftJHt;P- N:' ;~,\;'" -C$1!f L.td{ , Jr!: K/f.iJ:lII!.!JI!, 'I:: ~I:Ea JI}J: ~ ¥r:f1IU:. ,[I, I'd: {) ...

1. (J) :;: !iiU~ L- tr:. (J) -(', :ll!: ~ $1!fT {) 0 :2jq)jl K'imftl. -It {) t (J) C L- -c r:t , Pecten cmsS'ivenius , P. hastatus stl'attgus,

P. cosibens'is, P. hetel'oglyptus JJ<.7.F P. otutwmiensis ;,j' <b {) 0 ~:"/fr:t:lj;:.3t ,t, K lltljllle -It {) :t1u < ~:f1Il f'C¥j L- -C Pecte'n
1W.naUtaensis_ C

11i,.« L- teo1) U. S. GRAN'l' and H. R. GALE: Catalogue of the Marine Pliocene and P leis tocen e Mollusca of
California and Adjacent Regions, Mem. San Diego Soc. Nat. Hist., Vol. 1, p. 171, pl. 10, figs. 1-5,7,
1931.
.
2) R. ARNOLD: New and Characterist.ic Species of Fossil Mollusks from the Oil-Bearing T.e rtiaryFormations 'of Southern California, Proc. U. S. Nat. Mus., Vol. 32, No. 1545, pI. 50, fig. 13, 1907.
3) M. YOKOY,ULO\: Fossils from th e Miura Peninsula and Its I mme diate "orth, Jour. ColI. Sci. ,I m p. Univ. Tokyo, Vol. 39, Art. 6, p. 156, p I. 13, figs. 7, 8, 1920.
4) M. YOKOYAMA: Fossil Sh ells fr om Sarlo, Jour. Fac. Sci., Imp. Univ. Tokyo, Sec. 2, Vol. 1, It
8, p . _304, pI. 33, figs, 1-8, 1926.
5) S. NOMURA and K. }i,\TAI: A List of the Miocen~ Mollusca aud Brachiopoda Collected fromt h e .Region Lying Nort.h of the Nanakita R iver in the Vici nity of Sendai, Rilmzen Province, J apan,
Saito Ho-on Rai Mus., Res, Bull., No. 13, p. 130, pI. 18, fig. 7, 1937,-38 -R e)J ri nted from J our. Geo l. Soc. J"p"n, Vol. XJ.VII, No. 562, July 20t h , 1940

107.

On Some Fossils from the Hukaura Beds NisiTugaru District, Aomori Prefecture,
Northeast Honsyu
By
K. M. HATAI and M. NAKAMURA(Read and received April 27th, 1940)

During a short trip to several localities wit h in Aomori Prefecture, the writer s
had a chance to visit the Hukaura beds, and to collect some fossils from the beds.
Hitherto, the Hukaura beds h ave been known to be very young in aspect, but as
to the geological age from fo ssil-content, nothing was k n own . This is due to thefact, that the Hukaura beds ' are very scant y in fossil content, and that. to collecteven a few fragments, con siderable time is r equired. The frag m ents collected by
the writer s are briefly m entioned in thi~ article in order that · other authors in con ·cern may get an idea of the kind of fossil s the Hukaura beds contain.
The Hukaura beds, as worked out by S .· S H IBAYAMA1) in his g radnation thesis,-is the youngest Neogen e deposit found in Nisi-Tugaru District, and consists of soft
-pumiceous tuff, cross-.b edded loose sand stone, coar se-grained sand stone, sandy con·glomerate and rather c~ lcareous mnd stone, with orne shale. The present fossil s of
the writers are from the ca,]careous san dstone an d coarse-grained sandstone layer s.
'The Hukaura b eds u nconformably overlie the next older Azigasawa beds, which
in turn is conformable to the underlying Aka lsi b eds ; the Akaif') i beds are unconformable to the next older Tan osawa beds, which in turn unconformably oVf'rlie-the lowest or 6dose b eds.
Genus Pecten M ULLER, 1776

Pecten ingeniosa YOKOYAMA , 1929
1929 Pecten (ChZamys ) hastatus SOWERB Y, val". 'ingeniosa Y O KOY A~(A, Pliocene Shells from near Nanao,
Noto, R ep. Imp. GeoL Surv. J apan, No. 104, p . 5. pI. 5, fig. 2.
1932 ChZamys jarl'el'i ingeniosa KURODA, Catalogue of J apanese Sh ell ~ ,. Venus, Vol. 3, No.2. appendix
p.92.
1) K. M. HATAI and M. NAKAMURA:

Remarks on the Geology of Aomori Prefecture, .Northeast

Hon~yil, Japan, Jap. Jour. Geol. Geogr., Vol. 17, No~. 1-2, 1940. In t his article is given a full revi ew·of the stratigraphy and palaeontology of Aomol'i Prefec ture. K .M. HATAI: The Cenozoic Formations
and Fossils of Northeast Honsyil, Japan (MS) . . This article tr eats all of the Cenozoic formations andt heir fossils of Northeast Honsyil, and details are given concerning t he geology of Aomori Prefecture.
-

39 -

'.

Kotora M. HATAI and Manziro NAK AMUR,\

M. YOKOYAMA compa red this species with Pecten hastat1~s SOWERBY, val'. hindsii.
CARPENTER, described and figured by R. ARNOLD from. the Neogell e of California.
H e also compar ed Pect en i slandic'us MULLER with th€> present species. However, the·two m entionefl ones of California are sai d to differ from the Noto specimen by thesh ell-sculpture and length of the h inge. T . KURODA, as a r esult of his studies on
the Japanese P ectinidae, fou nd that M. YOKOYAMA'::; species sh ould be consider ed
as a subspecies of Chlamys ja?Te?"i (JONES and PRESTON), from Chinese water s. Judging from figures, it appears that M. YOKOYAMA'S species could be taken as a sub-·species of Chlamys chosenica KURODA, seeing t hat the type of radial ribs are similar.
Type Locality: - Near Nanao-mati, Noto Peninsula, I sikawa Prefecture (Noto·
Province). Probably from the Nanao beds.
Occurrence : - A cliff consisting of calcareou,' sandstone, sandy conglm11erate andcoarse-grained sandstone beyond Yunosawa, Hukaul'a-mati, Nisi-Tugaru-gu n . R eg.
No. 61377. The Hukaura beds.
Pecten het eroglypt~~s YOKOYAMA , 1926
1926 'Pecten hetel'oylyptttS YOKOYAMA, Fossil Shel ls from Sado, J our. Fac. Sci., Imp. Unil'. Tokyo, Sec.
2, Vol. 1, Pt. 8, p. 304, -pL 33, figs. 1-5, 8.
1930 Pecten hetel'oylyptus Y OKOYAMA, Neogen e Shells . from Yamashiro, J our. Fac. Sci., I mp. Uni,r.
Tokyo, Sec. 2, Vol. 2, Pt . 10, p. 400.
1932 Chlamys cosibens·is hetel'oglyptttS K URODA, Oatalogue of J apanese Sh eils, Venus, Vol. 3, No. 2,.
appendi x p . 89.
1935 Pect en (Pa ll'ium ) hetel·og lyptu.~ NOMURA and HA'rAI, Piiocene Mollusca from th e Daisyaka Sh eri-·Beds in the Vi cin ity of Daisyaka, Aomori -kel1, Northeast Honsyfi, J apan, Saito H o-on Rai Mus ,I~es. Bull ., No.6, p. 99, pl. 2, figs . 5, 6, p1. 3, figs. 1,2,7.

In regard to the variation of this species 'and its r elation to other allied ones,~ S NOMURA and K. HATAI h ave already .given detail r emarks in the paper cited
above.
The present specimen, which is a fragment of a left valve (?) , consists of th elower half of the sh ell. This fragment exhibits featu r es nearly idontical with figure3 of P ecten h ete?' oglypt~~s illustrated by ·M. YOKOYAMA (1926), except for th e slightly
stronger ribs.
Type locality : - Kaidate-no -sawa, Sawane-mati, Sado-gun, Sado I sland, Niigata
Prefecture (Sado. Province). Probably from the Sawane beds.
Occ urrence : - A cliff consisting of calca r eous sandstoJ;le, .sandy conglomerateand coarse-grained sandstone beyond Y uno, 'awa, Hukaura-mati, Nisi-Tugaru -gun ..
Reg. No . 61378.
P ecten of. is l andic~~s MULLER, 1776.

1924 Pecten ·islandicus OLDROYD, The Marine Shells of the W est Coast of Nor t h America, StanfordI
Uni v. Publ., Geol. Sci ., Vol. 1, No.1, p. 54. pI. 8, figs. I, 2.

.

.

\

The present specimens which are mostly fractured va~ve's; r ath eT .cl<?sely resemble the mtme.d species in,'the foi'mation of th e r adial sculpture and ear s . . , H owever ,.th e·.,pr(1sent specimens are sm.mll er iu size, more compressed andwith a fewer num- - 40 -

On Some Fossils from I-Iulmura' Beds Nisi·Tugaru District, Aomori P "efecture29&

ber of radial ribs, compared to P. islandic~(,s. Among the specimens at hand, a.
few have rather inflated shells.
Whether the present specimens can be considered as a varietal form of the·named species, or whether they should be described as ne:w to science is open toquestion, and only the futher accumulation of good specim ens will settle. the .problem. For the present, the writers hesitate to establish a new specific name, owing
to the unfavorable state of preservation of the specimens.
Type locality:-Northern seas, and distributed in the Arctic Ocean, Kamchatka
and Puget Sound; also in the Atlantic. .
Occurrerrce :-A cliff consisting of clacareous sandstone, sandy conglomerate andcoarse grained sandstone beyond Yuno 'awa, Hukaura-mati, Nisi-Tugaru-gun. R eg .
No. 61379.

Pecten species indet.
A small siz;e scallop, suborbicular in outline, moderately inflated, sculptured .
by numerous radial rib s which are roundly elevated, broader than their inter . paces
and show a tendency to bifurcation at margin; the hinge. line is rather long, ears·
unequal and radiately sculptured. This scallop r esembles no described species fromJapan either fo ssil or recent, but a new name is not given to it because of its·
being immature.
,
Occurrence : - A cliff consisting of calcareous sandstone, sandy conglomerateand coarse grained sandstone beyond Yunosawa, Hukaura.mati, Nisi-Tugaru-gun .
R eg. No. 61380.
Genus Ost?'ea LINNAEUS, 1758
Ost?'ea gigas 'l'HUMBE R G, 1793
1937

Ostrea (Crassostrra) g1:gas NOMURA and H A'l' AI, A List of the Miocene Mollusca and Brachiopoda
Coll ected f rom th e Region Lying North of the Nanakita River jn the Vicinity of Sendai, Rikuzen Province, Japau, Saito I-lo-on Kai Mus., Res. Bull., No. ] 3, p. 126. pl. 18, fig. 3.

Several water-worn specimens of this well-known recent and fo ssil species of, Japan is found in the presen t collection. The valves which are badly fractured inmost cases are somewhat thicker than tho se of recent specimens, but this difference·is frequently a result of the local environmental condition s under which thesesessile oysters live, Those which live in environments of shallow muddy beaches
as in Matusima bay near Sendai, have thin and ,'mall shells, while those whichlive in regions of th e open sea have much thicker shells. That oysters show considerable variation in the thickness of their sh ells according to habitat i.' wellknown, and further r emarks a re unnecessary.
Ty pe locality: - Unknown to the writer s.
Occurrence: -A cliff consisting of calcareous sandstone, sandy conglomerateand coarse-grained sandstone' beyond Yunosawa, Hukaura-mati, Nisi-Tugax'u -gun .
Reg. No. 61381.
Genus Acmaea ESCHSCHOlIl'Z, 1830
Acmaea &t>ecies indet.
-

41 -Kotora M. RATAI and Manziro NAMANURA'296

A single specimen, partly broken and embedded in the matrix. It is subovate
outline, apex nearly central and rather elevated.
Occurrence :-A cliff consisting of calcareous sandstone, sandy c.onglomerate.and coarse-grained sandstone beyond Yunos~wa, Hukaura-mati, Nisi-Tugaru-gun .
Reg. No. 61381.
Besides the above mentioned fossjls there are also many echinoid-spines anda f ew r emains of a certain bryozoan, in addition to several 'fragments of the te,'tof a certain sea-urchin, probably close to St1·ongylocent1'otuS.
A mong the species m entioned, Pec't en ingeniosa YOKOYAMA was first describedfrom the Miocene Nanao beds of I sikawa Prefecture, and range in time from the
Miocene to Pliocene (?) Pecten hete?'oglypt~(,s YOKOYAMA was first described from
Pliocene deposits of Sado I sland, Niigata Prefecture ; possibly from the Sawane
beds. This species ranges from the Miocene to Pliocene in time. Pecten cf. islan. dic~(,s MULLER doe, ' not appe51r to be living in Japanese watel's, or elsewher e andprobably it represents a new, pecies . . Pecten species indet., may also probably r epresent a ne\v specie ', but being immature, it was given no name, Ost1'ca gigas'TnuMBERG is a living species which r anges in time from the Miocene to r ecent.
Acmaea species indet., may probably be a living species, but since its outer sculpture is embedded in the matrix, nothing definite can be stated.
From the above fo ssil fauna, the geological age of tho Hukaura beds seems
to be Dot younger than the Pliocene, the term being used i n the sense now employed by the meinber s of the Institute of Geology and Palaeontology, Tohoku Imperial University, Sendai.. However, whether the geologicai age is Lower Pliocene orUpper MioceDe, must be left until furth er specimens can be collected. From the{)ccurrence of Pecten ingeniosa it appears that the geological age might b e Lower
Pliocene, and not Upper Pliocene.
At this place the writer s wish to express their thanks to Prof. H. YABE of
the 'Institute of Geology and Pa.laeontology, Tohoku Imperial University, for kindly
giving th e writers permission to publish this note. Acknowledgements are also ,·due to the Saito Ho-on Kai Foundation in Sendai, for the grant-in-aid, which en.abled the senior writer to visit mally localities in Northeast Honsyu.
Il1~*~Y;tllfillRJi!,j\l1!fiil!il~'IlIIi*itfil!fJJl[f9J K f1ibftl:-t- 3 JYr fil'li*iflJlEfo:>.?:i1J(:'iHP ,IM-,&;flI.;f§L'.tPJM"l' J; ~ 1t.?:ia: 1*~ L..t::: o:> -e,~~X~~.?:i~.~L,I~ • • IEfO:>~~K~~~.f~to:>-e~~o~3ta:p f'C re~H PC Mt.?:i il' i:>1/il1.:-c , i*riIJil!i-f;t~irr*X J: ~* < f';!:tJII ,-e <b;"> 0 1:1.'; L rtmf!~irr~i>,:gjzf';!:"l'irr~ Cl) \t'-?t~f'C~f ~ ii, r.l:~*o:>fr1j'l!Ef'C J: ~ ~!lI'j i:> iI, K: L tc 11 ' 0 t:::ti Pecten 'ingen'iosa ~ 1-;-1trt- ~ iEI1ji>' ; J\!. ~r 1~i\!i;f,irr~

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Lituolidae
1. Haplophragmoides subgl'obosttm (SARS) .... ••2. Cye/amina lJaucilocu[ala 0USHMAN
Tex tulctriidae
3. Textularia agguU'i nans d 'ORBIGNY
R
4. T gmmen d 'ORlHG NY . . .. .. ... . . , ...... ... . C
5. T . sagittttia DEFRANCE . .. , ..•... .... , . ... .
6. T str'icta CUSHMA N . . ••.. . , ... . , . .. . . ,., • . .
7. T. sp. 2 ....... ... ................... . . . ... .
Vernuil inidae
8. GaudrY'ina quadrangulal'is B AGG .. . . ,. " . .. .
9. G. tri(tngttlm'is CUSHMAN .. ..• ... . .... . ... ,.
10. G. sp, 1 ........... .. . . .. ... . . ...... . ..... R
Valvulinidae
11. Gcescllct sp. 1 . ... ............... .. ........ .
12. Kan'eriella baccala japonica ASANO . . ..•. , .. .
13. L isterella b7'Ctdyana C USHMAN .... . ... ... • .• . •lJ£iliol-idae
14. Quinqup/owl'ina cUI·ta CUSHlIIA N . . . . . . . . . . . •1 5 . Q. lamarck-iana d'ORBIG NY . ..... , .. , .• , ."16. Q. 7'ttgosa d ' ORBIGNY .. . .....• . , .......... .
17. Q. sem-inulum (LINNli) . . ... • . •. •.• , , ... . , ' .. .
18. Q. vttlgm'is d'ORBI GNY .... , ... . , . ... • . •• , . . . C
19. Q. cf. yezoense ASA NO .......... .. ..• , . , .••.
20. Q. sp. 1 .. ......... . ..... . . ... . .. . ... . . , . . . .
21. Q. sp 6 . ... . ........... .. ... . .... .. . . . . . . . .
22 .. Q. sp. 7 .. ........ . . .. .. . ......... . ... . .... .
23. Q. sp. 11 ...... . ............. . ..... . . . .... .
24. Spirolocul'ina ant'i llarum d'ORBIGNY . . . . . . . . . . R
25. S . canaliculata d'ORBIGNY. '. . . . . . . . . . . . . . . . .
26. S. depressct d ' ORBIGNY.. . . . . . . . . . . . . . . . . . . . .
27. S. grat elnupi d'ORBI GNY ... , .• . .....•. , . . . . .
28. S. cf. costata fLmA . .. . . .. . .... . . , . ... ... , .
29. Sigmoilinct celata COSTA ... , . • .• • •. , .. . . . .. .
30. S. sigmoidea (BRADY) . ........ . •••. . .. . ....
31. HaUl!rina fmg~liSs'imct (BRADY) . ..... , . .. . .. .
32. T,'il octu·i na circularis BORNEM ANN .. . . .. , . .. , .
33. T . C'i7'Ctdm'is subl'ineata (BRADY) .....•. • . , ..
34. T . oblonga (MONTAGU) . . ... . . ..... .. ....... .
35. T ' trical'inata d'ORBIG NY . ... ........ . . . ... R
36. T. t!'igonnla (L AMARCK) .... . ...... . ..... ... R
37 . T. sp. 1. .. ; .. . ................ .. . .. . . ...... .
38. PYI'go anomala (SCHLUMBERGEH) . . .. . . . . ... .
39. P. e!ongata (d ' ORBIG NY) , . . . .. ...... . . . .. . ...
40. P. sp. 1 .. ............. , .. . . . . . . .... . ... . .. .
41 . P. sp. 2 . . ... , . . . . .. , . .. . ......... . ... .. . . . .
Ophtlw 7m'idiidae
42. Planispi!'ina sphae.?'Q, (d' ORBIG N Y) . . . . . . . . .. . .
No dosariidae

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43. Planul m"ia t?·icm·inella· (REUSS) var. . . • . ....
44. Marg'inulina glab?'c£ d'ORBIG NY . .. . .. .. ..... .
45. Glandt£l'i na laevigata (d'ORBIGNY) .... . . . ... . .46. Ool'ina laev'igata (REUSS) . ..... . ........ .. . . .
·47. O. mm·ginata (W AIJKER and Boys) ..... ... . .
48. Dentalina setanaensis ASANO . .. . . . .. . ...... .
49. Nodosaria pyrulc£ d'ORBIGNY ... .. . . . . ...... .
50. Lagenodosm'ia scalmois (BA'I.'SCII) . . ... , .... , .
51 . Lagena acuticostc£ta REUSS . . . . . . . . . . . . . . . . . .
52. L . elongata (EIIRENBERG) ... .. .. . . .. . . . ... .
53. L. hexagona ( WILLIAMSON) .. ........ . . . . . .
54. L . squamosa (MONTAGU )..... .. .............
55. L. striata strumosa REUSS. .. . . . . . . . . . . . . . . .
56 . L . sulCCtta (WALKER and JACOB). . . . . . . . . . . .
57. L. sp. 2 ............ .... . . . . .. .. ...........
58. Robulus limboS1!s (REuss). . . .. .. . ............
59. R . o?'biculm-is (cl'ORBIGNY).... . . . . .. . ...... .
60. .Fisst!?"inc~ ci?'wlo-costata ASANO. . . . . . . . . . . . . .
61. F. o?'bignyaua (SEGUENZA) .... ,.... . . . .. . . . .
62. F. Q?'bignyana laccunata (BURROWS a nd HOL-

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P. st£boblonga CusmrA.J.'l'.aucl OZ AWA . . . . . .. .

Si gmomo?'phina setan aensis ASANO .. ... .. .. .. .
S. triloculm'is (BAGG) . ... . .... . . . . .. . .. . . . .
S. sp. 9 . . ........ . .... . ~ . ... ... . . . .... . ... . .
S. Sp. 13 .... . ............ .. ;,. .... . . . . . . .. . .
76. Polymo?'phina charlottensis CUSHMAN
Nonion·i dae
77 . Non'ion gmteloup'i (cl'ORBl GNY) ......... . ... .
78 . N. pompilioicles (FICH'l'ETJ and MOLL) ... .
79. Pseudononion japonicum ASANO. . •. • . . .. . . . . .
80. Ast?'onon'ion stelligerum (d'OHBIGNY).. . . . . .. ..
81. Elphid-ium advenum (CUS FIMAN)........ .. ....
82. E. c?'ispuln (LrN1-o'J~ ) . .. . . .. . . .. ... . . . . . . . • . .
83. E . jenseni (C OSHnIAN) ..... . . .. . . .... .. . . . . .
84. E . subgranulostL?n ASA NO .. . .......... . ....
85. E . sp. 2. . . . . . . . . . . . .
.. ..... .. .... ..
Bul'iminidae
86. B ulim·i na aculeata cl'QHBIGNY. : .... . " .. .. . . . .
87. B. inflata SEGUENZA . . ......... .. .. .. .......

RR

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71.
72.
73.
74.
75.

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Polymo?-ph'inidae
63 . Guttt£luina austrioca cl'ORBIGNY ..... . .. . . . .
64. G. o?'ientalis CUSHMAN and OZ AWA.. . . . .. ...
65. G. yamaza7ci'i CUSHMAN and OZAWA... . .. ..
66. G. yabei CVSHMAN and OZAWA . . .... .. .. ... .
67. G. ir?'egularis d' OBBIG1-o"Y val'. ..... • •.. ... . .
68. G. cf. spicae!o?"m'is (ROEMER). . . . . . . . . . . . . . • .
69. G. sp. 6 .. .. .. .. .... .. .. .. .. .. .. ..........
70. Pseuclopolymorl1hina hanzawa·i CusmrA.J.'l' a nd

333

R

R

R
R

R

R

R

R

R

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C
.A
R

R

R
R
R

C
R

R

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45-

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R
R

R

R
R

R

334
~
~

88 . . B.

?'obttsta BRADy .. . . . . . .. ... .. . ....... ... .
89. R eusella spimtlosa (REUSS) . . ........•..... . .
90. CMys alidinella d-irn01'plw (BRADY) .. . . . . .. . : . .
91. Ut,ige?··i na cana?'iensi~ d'ORBrGNY .... . . • .. . . .
92. U. pyg maea ' (+ b'ijttr!xtta) of ASANO .......
93 . Siphogene?'ina raphana (PARKER a nd J ONES)...
94. Anguloge'l'ina angulosa (WILT.IA~[SON) . .. .. '. , .
95. T1'ifarina /; raclY'i CUS HMAN . . . . . . . . . . . . . . . . . .
R otali'idae
96. Discorbis braclYi CUSHMAN . ... . .. .. . . . ..
97. D. upercularis (d'OmnGNY)
98 . D. o?·bicula.?·is (1'ERQUEM) ........... . . . .•. .
99 . p. t'ila?'clevoana (d' o i BlGNY)? ... . . . . . .. . . . .
100. VaZvulineria allomo7'lJhinoicles (REUSS) . . . . . ...
101. Eponicles concameratus (MONTA GU) .. .... '.' , .
102. E. haidingerii (el 'ORBIG NY) .. ..... . .. . . . ...
103. E . kantenii (REUSS). .. . . .. ....... . .. . . ... . .
104. E . ?·epa.nclus (FICII 'l'EJ, and MOJ. L) . . . . . . . . . .
105. E. tene?'us (BRADY) .. . ... . ... . ..... . . . .. .. .
106. Rotalia. becccwii (LI'NNE ) . . .. ..... . ..... . . .. . .
107. R. j aponica H ADA. .. .. . . .. .. .. .. . . . . . . .. . . .
108. Epistomina elegans (d'ORBIG NY). .. . . . . . . . . . . .
109. C'a.ncris auricula (FICfITEL and MOLL)
1l0. Bogg'inct totomiensis MAKIYMfA . . . . . . . . . . . . . .
Cassidul·inida.e.
111. Cassidttlina jCtPo.nica ASANO and OT AKA~[URA. .
112. C. subglobosa BRADY . .. . ..... . ... . . . . .. .. .
113. C. sublimbata ASANO and NAKAMURA ... . ..
114. C. yabei ASANO and NAKAMURA . . . ..... ... .
ChilostomeZlidae
115. Pullenia quinqueloba (REUSS) . . . . . . . . . . . . . . . .
116. Sphae?'oiclina' bttlloides d ' ORBIGNY. ...... . ....
Globigerinidae
117. Globige?'ina bulloicles d 'ORBlGNY . . • ,... . . . ..
118. G. inflata d'ORBIGNY ... . . . , ... ... . ...... . .
119.

G.

120.

sp. 3 ...... . ...... . . .. . . . . . . . .. . . . . . ...
G . sp. 4 . , .. .. . . . . . .... . .. . . .... .. .. .. ....

121.

Glo~igerinella aeqttilatemlis (BRADY)

C=Colllmon ;R

R=Rare)

-

46 -

R
R
R
R
R
R
R

R

R
R
R

R

C
R
R
R
R
R

D~M

M

m ~ M
M

~

~

~mM
~

R
R

R
R
R
R
R

R

R
R

R
R
C
R

R

R
R

R
R

R
R
R

l~

R

R
R

A

A

R
R

R
R

R
R

R

R
R
C
R

A
R
R

A
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C

R

R
R
R
R
R

R

........

G. sttbcretacea (CHAPMAN) . . . .. . . .... . . . . . . .
Globigerinoiclcs conglobata (BRADY) . . . .......
G. heli cina (d'ORBIGNY) . . . . . . . . . . . . . . . . . . . .
G. rubra (d'ORBIGNY) ... .. . . ..... . .. . . ..• ..
Globo rotali:iclae
126. Globorotalia menardi (d'ORBIGNY) . . . . . ... ..
Anomaliniclae
127. Anomalina cf. ammono'ides (R~;u ss) . . . . ... . .
128. Planulina wuelle?'storji (SCHWAGER) . ... ... . . . .
129. Ci/l'icides lobatttlu.s (WAJ,KER ami JACOB)
130. C. ?'efttlgens (MONTFORT) .. . . . . ... ... .. ... . : .
]31. C. ungerianus (d'ORBIGNY) . . . . . . . . . . . . . . . . . .
122.
123.
124.
125.

A=Abu ndant:

R

m M
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R

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335,

~ 1...-0 0 lltOJ m~ttlH;t *1fI)-4~i* mtlJJ.±OJ ¥IHs--1t Gklk A EEl t. fi'1J~mfL it>.r::>L, 'f;ffLiEfrOJ roi~kl

A EEl-c' 1lJ~ ]:J ,,~(,: ilii fL ~ i" ~Polystomellina d·iscorb·i noides I'i ~ Ji!. ~ kl ~1f:, :;k:Z!:iI!Ti 0 iJ',

7J>-0tz.o 3l... Cassid2tlina japon·icct- 1'i~:f:i!J. 55.R lt~:f:i!J. 57 c'l/:,~1J&I'c;tE~iJ', AEElfL~\,A

L I'iI fL~1...-\,A o ~I'i~Mt~OJm~M~~

ffi1-0L l.Jk~-c' it> G ') iJ' , f~ 1...-iWJzJj;OJt%HC.'f;ff Lf,JitlJlEi OJifE~f![l'iill~If.iJ;f*-c' it> ~ 0
J:mt.T1ftOJ~) II M~ .1:t~1...- LJiL~t., T, mOJ J[) IIfiT I'C 1/,:-0 L1mIif'i2~OJ$- 0 l/:, OJ l'i l 'ex -t21,lm'ict sagit't'uZa, Q~tinque locuZ,ina v~tlga1'is,Cassid~tUna ja,p onica, G Zob·ige1'i1~a b~tlioides,

G-ibic·i des lobCtt~tlus ~-C' it. ~ 0 X:flll:!mOJ$- 0

OJ I'i Milio lidctc t. N odo scwiidae C' it. ~

0

.r. .

1iLCOJ[)I1Jii-1'C jR-0 L I'i Cibicide 1'e!ulgens iJ'•-;:P; 1 l\iil

T= ~ iCllilf

1i'llJ:. G7) 'lJi:j)j}lf.:l:i.llt:lU!'lJi:~'t:~ffi;-t

S= ;f[li1:t!M Ny =IDhuJilt H=1JcJf\ /ff
N= im~M§i3l:.-0 L $- <, Cassicl'lllina I'i Ji!.t GtciJ>-0

k , ~ G <~j=.1t.I'Cf$;fL~OJc'it> G ? 0 ~:f:i!J. 58 t.If.iJ}%f'j!,;OJ1t!!. OJ~.;rJljf-c'tRW: 1...-k*f.f* l/:, C{lssidulina
1'i~j=.1j!,- I'C~~;v>-0kOJc' , Jl:l:;0J1Iftlli:c'I'iJ:1ftOJ g[) IIJiI'C Cassir.1tthnn i6~0 41-t 1 -0OJtf!fq~t. 1...L l/:,:;k:iillltc \,Ac'it> G ') o~:f:ilL 58 c'l'i Mi/iolid cte ReF Nodosar iidae OJ:flll:!I!.NI'iT1iLOJ 2 ~:htl!. I'C .1:1:~ 1.. - L~j=.1tI'C~~ 0 0~1Llfm~± I'C 1ft!J niP't~(~*~J OJ'f;ffL ;liM.tT:i~W 1'iJ[) II'f;ffLiEfr1.tT:ifj'o t. Ilfff'tL L 1.'> ~ 0 IJ[ ) IIJ I'i
ffiI. %It OJ li!lU~-~ ~ $-:Ii: I'C ilf:."lf ;lt T:i Ee~T&* I'C t Jl' ~ ~ ~ :f:i!J.:75 0)::15 ~ c ', -'3_0;-9(J1i..Jf.r I'C ~~1' ~ rfrff~J{}I\!it I'i:JJtkJli i'b -0 L, $- ~ 1'-HLiEfr (oro! ~ kll/:, J~~ tc ~ OJ C', n=.iJlJHm ill itbEEl .!?tl!.::151'C 1/,:- \f) L A EEl R r.t fi'1J fflHiL
OJ 1.t1EiJl!0)%:1~it> ~ 'f;ffL $Ji~i¥' H?r l'C~\. EEI'f;ffLiEfr1.t1Ei$'f: t. nf ~ c t. I'C 1...-, ;J;t:OJt~J;t~.!?tl!.I'iA EEl t. T ~ 0~ 1...- I J[)IIJ I'i*m ~ffi;1'OJ 1'C1\f~%iJ'.& 0 OJc-; *;)( 9' C' I'i;J;t:OJ~I*c'Ji~ 0- L it> ~ 0. iffllllff . 1*~ 1...-;lt0J1'i 1 .;r ~jfc', J3_.r::>'f;ffL ff,\\';I'i~j=.1j!,- I'C~tciJ>.r::>k om~ff* AiOJT&*ffi*1Li!H> GI'i 3 .;rJljfc·1*~ 1...-td', '(iiJkll/:,:&*OJ1fI)5J' ~1*~ 1...-k o j!~OJ'
56 C' H aplop7wagmoides subg1'obosurn iJ'~F','ftI'C$- <, go'c'sella 'sp , 1 l/:, ~~ <~ 0 0 flhOJ 2 .;r JlJi;c'l'i NO~liiol~iclae, B u liminidae, Ro taZ£-id ae ~O):mJr~ 1...-iJ>~!!Ii <,1*~:f;tl!.!.l],li OJ Y'I c'tf!ft!. it. ~ OJ I'igE:htl!.

j!~ ~ Y L ;fiti!- J!- OJ 1ff LiEfrfj'o ~ 1-t~ ~ ~ ~ I'C I'i fi~ ]:J I'C ~ ~f3 c' it> ~ iJ', ;-9()l\J!r OJtf!f1!1& it> ~:flll: I'i {iiJ kl t
~p1tI'C %~iJ >30t~f~~ 1...-~ 0 c t. 1'i~IJild,it> ~ o RfI/E\J*-ilI nbEElOJ1LIf~ ) I\ OJ~c'1*~ 1...-k*f.f*I'i~1t~Jii-I'Cj\tt.1:t ~ kl ~ *- ilI ~I'C$-:JJtk OJ'f;ffL ili\\1 ~~Jj!, L., ZRJ1i..JEi-I'C ;ff:lt1' ~ s*MiJ> G I'i ~:rg <~~:O> 1...-:O>~

Jj!, I±'r*i', J::T O)t-tl!.}i-I'C $t ~ 3'E5J' tc.1:l:ij~;6' I±\ *tc iJ>-0td',

4- /E\J;-9()1\Jii-:o> G1'i$-!J&OJ'f;ffLili'Ji ~ q~ k

iJ' T mOJftt:fr}i-iJ> G1'i~j=.1t l'C~tc <4-fBJ l/:, ZiJ-3'E:£' tr. .1:t~iJ' l±l *tc 0 OJ l'iifit~-c' it. ~ ~1t~Jii-OJ 'f;ffL
ili'JittlEi t. *- r.lIAiOJ ~ OJ t. t .1:1:-" -c1f 1...- 0Z!:1'i*- I.lI J15- I'C~~c' it> ~ UV'igerina iJq1t~Jirl'Cil!Ti0 c t. C'
it>~ o f~ 1...- cfL l<t1P'1J k Uvige1'ina, I'C z 1...-0~~ ~*~ 1...-kOJ:O> ~ 1...-kli', {iiJ5J'fL l/:, iWlEJOJ *- I.lI}1iOJ,
0~-@-I'C tl: ,,~f.1j!," l'C1*~Jt.l!i!.l}jiJ' ~ tc 0 OJc',

tA!:5:Ei3':Jtc4j;f.I'i7i:O-,iJ>-P ~ 0,*ssJif nit 1 .;rJljfc' 1*~ 1...-k?t-c'iV ~iJ', Cyclami1Ut 1Ja~tcilo c~blatCt iJ'$-:JJtkiV ]:J , ~nt~-c' t 1lJtr:.
lJ nm1'C0 <;f£c' it. ~ iJ' , 1t!?OJtID:1JilifE' ~iI!Ti\,A o ~1E IllJOJ;:jt::15M1§W!) 11 OJ:W:I'C£f1±l T ~~1SfiT I'C~ 0<, 1t!!. OJ:flll:~~ I'i~!J Jj!, 'i GtciJ>-0k o Cydami1~a pCtn' iloculata OJ$-0-C 'b Cyclam,il~Ct iJ' ~F1t I'C ~

-

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338
Teradomari Formation: eyelam-ina p ai~eiloeu lata is common ,In order t o show th e ' r elative a bundance of different fami lies in the th ree locali ties, L oc. 58, Loc.
55 and Loc. 57, in th e H aizume Form ation, a value is arbitraril y assigned to each letter in th e cheeklist: R=l, C=JO, 1\.=20. Table 3 shows ' the nu~be r of abundance for each family based on theseapproximate figures and the p er centage of abundanee for each famil y in the three locali ties when
the total number of abundance in Loc. 57 was taken as 100. Fig. 2 A is a graphic interp retation ofthis tabl e. Fig. 2 B shows the r elationship of the famili es in twelve localities in the Higasi yama andAraya Formations of the Higasiyama Oil Field.

-

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335,

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1/:, **~!Piv.iJ);, ~,- EEl-C:' 1iJ1'J:. ]) 31,* im. K ~ 't" ~Polystomell-inct discorbinoides i'i~ji!, ~ tL1.J:
7J>-0k o 3l... Cassicl~t linct japonicct i'i~j;t!!. 55:&,lJ g'fi:f:-t!!. 57 -C:' 1/:, ~ 1)& K;ff: ~ iJ);, A EEl K 1/,: V.
-C i'i][ K~ L- v.o ;i!i'i:l1Hjl{t;II;If~:al!-!:>1iJ);~j;~~-C ?:lk~-C:'ih G '5 iJ', f~ L--mr:i&~;{<~K~-tLili'Mt lEi ~m~\;flIti'iJ!l*fi'iJ;{<*-C:' ih ~ 0
J:1ft ~ T-1ftO)][) IIJlitr:" W J13(: L- -c}t ~ ~, T, 1:U:~J~:; ll mKM,'-v.-c 111!11lf1)&~~v.1/:, ~i'il'e~l' tttla1'ict sctgittttla,

Q~t'in q~telocul'ina

vttlgcw·is,

Cassidulina ja,po1zica, Globig e1'i1!a b~t Uo·icl es ,C'i bicides lobatttltts ~-C:'ih~" 3l...a!li)~~v.
~i'i

JJl iz.iolidae ~ Nodosa1'iidae -C:'ih~o L '~:lL -0 -C ~ <,,~ 1

T= ~iE M

1ft ~ bl:) IIJti-K 1/,:v. -c i'i Cibicicles ?' ef~G lg ens iJ'
Cassidttlina i'i ji!, t; G1.J: iJ>-0

rnn J:. O):jIHiJU.:l: .i1EJ1l!;fJH!H: 5f.; i'"S=;j:IW/i'r Ny =ggrlJlIt H=YUK/i'r
N=ggJl!R1!TI@'te , ~G <~F1¥\'.Kf$tL1.J:O)-C:'ih G '5 0 ~:f:-t!!.58 ~fi'iJR1~!i~fU!.0)1)&7J:iJf-c:':jt..R~L-k~;j;fU) C[tssidu lina
I't~F~~·Kj;t;O'J>~7C.~-C:' , .llt~~{tlli: -c:, 1'tJ::1ft~ JL) II ~rK Cassiuulinn iJ'j;v.~t- 1 -00)%1~~ L-C 1b*~1'J:. v.-C:'ih G ') 0 'g'fi:f:-t!!. 58 -C:'i'i Milioliclae JJz'lj.' Noitos cP' iidae ~;flIt!iJii'iT-1ft~ 2 g'fiJ;t!!. KJ:tiJ13(: L- -C~F1tKj;1.J: v. o~!l'fn1f~±K1ft]) Ivyj!(ffl*Jti-J 0)~-tLili'Mt1:iff-i'iJt) I I~-tL~1tlEiff- ~ 1J.,]i-l'f'tL -C?:l ~ ~ 1]f)IIJ i'i
ffilJl*:O)I.iiJ()l-~ ~~:I: K ylt-1fk1:itTz't!t1iY*Kii"t ~~f3U-t!!.::to)::t li -C:' , 1L-:::>tTzJ1\JliK ~;lET ~ FYTil~8L)II}%I't:J)&Jti-ih-0-C , ~j;~-tLf,,1OJ*Jj~tL 1/:, ~1.J: ~ O)-C:', iBi!IJt· gIT ilJ ir:13 EEl.l:il!.::t KM,'-0 -cAEEl:&. lJI'iilJti-1ft0) 1tlEi~riotf;!H~ih ~1r-tL ~ff- tr:":ilTKAEEI ~-tL ili'HtlEit-J'(; ~ n¥~ c: ~ K L-, ~O)~'tttg'fiJ;t!!. i'iA EEl ~ T ~ o@. L- 1]f)11J i'i*m tr:"5FT~ Ktfli;-iJ''& v.~-c:'; *3t 9'-C:'i'i~~:lf-I*-C:'Jf:I (}. -C ih ~ 0' iNllJm' :#R~ L-7c.~i'i 1 7ft;r-c:', £L-01r-tL ili'iliI't~F'hi·Kj;1.J:i.p~k o
mi:rJi *Jti-O)r&* ffl* lim-iJ> G I't 3 7 J:ilf -C:':#R~ L-kiJ', '(iiJtL t ffl*0)1fI)5t tr:":#R:jjf~ L-ko ;i!~~':l*~j;il!.jj)}iO)rt' -C:'%13ih~~i'i~j;il!. 56 -C:' Haplophmgmoides sttbg?'obosttm. iJ'~F1¥\'K~ <, goc'sellap, l tj;1.J: <1.J:v. o 1ti!.~ 2 7P)j'-C:' 1't NoniO?~iclae, B tl,linbinidae, Rotaliidae ~0):J)&~L-7J> ~!Pi <,::llk~tr:" tJ, -c*i{(§-J!~~-tL~ff-~ 1t~~:,r- ~ K I't~ ]) K~~§J-c'ih ~iJ);, tTz)1\ m-~%1~ih ~;flItI't1iiJn t~ F1t Irc.g;~iJ)3l...I't~ftg'fi L-1.J: v. c: ~ 1't~1J;ji:iJ'ih ~ o iJfJ lenlWl irJl EEl~!b'fM!: ) II ~ti-'-c:':#R~ L-kt~~I't*i~
1fJti-K~iJ:t ~n~* U-l mK~1)&~~fLili'ilitr:"~~ L-, ~<.J1\JliK*f:lt; "t ~S*J!iJ> Gi'im <~i.p L-iJ>~
Jj!, w* i', J::T-O)j;i!!.m K £t ~ :7E5t 1.J: WI& iJ' 1:I:\ ~<:'1.J: iJ >-0 7c. iJ>, ~ /e;\tTz}1i.~7J >G I't~ 1)& ~ ~ -tLili'J1 h.(iJfc.
iJ'T{:u:~*'fu~~Jti-iJ> G I't~F1tI'Lj;1'J:. <~/e;\ t ~:7E5t tJ: J:tiJ13(:iJ'W*1.J: v.~ I'tilitr~-c:' ih ~ 0 ~1H:~J!~~-tL
ili'Mt lEi ~ * Ili )fr~ t 0) ~ ~ J:I:"'-C~ L-v.*I't* U-I Jti-Ktlt~-C:'ih ~ Uvi.CJ8j"inCb iJq1t~~i1*K~v. c: ~ -C:'
ih 0 0 f~ L-c:tL l' i{il'I k Uv ige1"ina, Kz L-v.~tr:":#R~ L-kO)7J> t L-ni', {iiJ5tK 1/:, -mr1'§:JO) * IIIJ~~'
tt';i;-K I:t ""~F1t (rc.:l*~:f;M}jiJ'j; 1.J: v. 0) -C:', tJ(5Ea':J1.J: ~J[i-I't~'(}.iJ>tl. ~ 0~)BJi fI~ 1 7 J:ilf -C:':l*~ L-k3t-C:'ih ~iJ{, Cyclami?~a pmtcilocttlata iJ,~:J)&ih ]) ,_ ~H~-C:'1b 1iJ1.J:!? flRK-0 <~ -C:'ih ~iJ', fU!. ~;flIt~~I't~ c'1!Pi v. 0 q:1E UlJ ~ ~~::t:ilT1~H.m )I I ~W:K~ I:I:\ T ~q:1SJtiTK1/,:v.
-C 1b C.yclctmi1~a iJ'~F1tK~ <, fU!. ~'fillEliJ.ii'iftf-]) ~1'J" Gt.J..iJ>-07c. o Cyclc('minct lJCtn' ilowlatct ~~0

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1-"-+------+---l--+--+-+--!---,illll-+-+--+---!!4 B 0

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An omal i ni dlte

Nonionidae

Clobigerinldae

Polymorphinidae

II

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.60

II

Chl1ostome l lidae Nodosariidae

mD
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0000
~oooo

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30

Cassidulinidae

Mill olldae

Rot ali idae

Vernu ilin idae

Buliminidae'Textul.a ri idae

Hete r ohelicidae~ituoiidae

40

,30

20

20

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L oc.S8

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CA)

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22

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28

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32

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tkffi.$,!: 1R111)§ ,!: ~ J;t)iBl: L--eJt Q ,!:, fauna Cl)tfi~fLiJ' ~p'ffi'K~l !? , fauna ~1i/1J;nJ(;i- Q fami ly~a%~~%~!?~k o ~~~.K~QaK*Cl).~~~~*~k o ~~.Cl).W.~KA =~·C =10, R ",,1 Cl)JllJ;i. ~ th~" , {§- fami ly Cl).ill:J;i.~Hvt GfLk. WiJ.Jj~ ~ 1±'rl. . . {§-.j:il1 Cl). J'±\tJij~~Cl)*~jjt~~IflJ L--e, {It 1h~\.nJi.Jf~ 100 ,!: L-k~%Cl){§- family Cl)8?i'*~ J'±\ ~ tkffi.JEj-Cl) 3 &-EffCl).j:il1
KJ¥;t\.n-eqj-0k{§- family Cl)JllJ;i.~H vtG.t1k. IflJiJ.Jjg[RV::~1hffi WtJiN~Cl) * 1!\.n.:tll!. . 5 7 Cl)~ 100
C L-k~%Cl)8?i'*ri~ 3 *K ffiL--e ibQo:&~ I@ffiL-kCl)i61if~ 2 ~ A -c' ibQ o mlf*Cl)41H:'ll}~ )II :fi-Q)1RllI JEf ' 5iE:fi-JErK ;oji;t\.n -eD0 kCl)iJ'~ 2' lim B -c' ib Q 0 Jl± Cl)~~ ~ Yt.t1tr ~Hf:lT Q ~ 1h ~<, ;!'t:Cl)~J!lIliJ, Jlf:liJ '-c'ib Q o iWK 1h32l!;---;:k+*K~1t:fi-JErCl)lftL !l'!Jil'>~ p1t~ Kj; <, 1*~iJ(/G3'E?i'-c'ib-0kaK, :Y(ffi. JEj- c11t:fi-Ji- c KZt\.n-e m.Jf;ilUi J:t)lBl:ri~.ft~iJ' GIflJ *~:b,~tco
trlll~r!K'&!? *Wi!l1lEO)tltWr~!If!"""" G.t1, 'f:illkqlf\ltffi'ffi, qIf\l~JlJJ ~Jlt\0k El ~7rl1WrIfct:Cl)*~""-~~±
0~Km.Jn~~~Cl)~kK~~~*TQ o

-

4.8 -

337
3

Loc. 58. Loe. 57

Loc. 55

Abu n da n ce%

Abun rlan ce%

Abunda n ce%

Te.'r.tu lm·iidae
Ve?'J!uil'in-idae
Valvu linida e
M-il-i olidae
Ophthalmidiidae
Noclosan'dae
Polymm'pkinidae
N on'ioniclae
Bul-imida e
R otaliidae
Casi'icluliniclae
Chilostumellidae
Globiger'i nidae
Globorotctliiclae
A nomalinidae

11
1
0
13
0
'1
3
4
2
4
0
0
14
0
23

3.9
0.4
0
4.6
0
0.4
1.4
0,7
1,4
0
0
4,9
0
8.1

23
10
1
60
1
16
17
33
7
19
22
2
37
0

8.1
3.5
0.4
21.1
0.4
5.6
6,0
11.6

32

6.7
7.7
0.7
13.0
0
11.3

23
22 '
1
58
0
12
9
15
7
20
21
0
43
1
52

8.1
7.7
0.4
20.4
0
4.2
3,2
5.3
2.5
7,0
7.4
0
15.1
0.4
18.3

Tota l

66

26.9

280

98,6

284

·100. 0l.l

2.5

T er tiary F oraminifera from the Amaze Oil Field(Resume)By'runetel'U OINOMlKADO
Th e Amaze Oil Fi eld is situat e d in I Zllm ozaki-m ati, Niigata-ken a nd eigh t samples collected_ th erefrom co nsti tute t h e m at.erial of this r esearch. More precisely, three of them wer e collec,t ed fromth e H aizume Formation, one from the Ni~iya m a Formation, three from the Sii ya Formation, and one
from the T er .ldomari F ormation , Fig. 1 shO\\'s these fossil localities, The signific an t Foraminiferasof th e fa unas contained are liste d i n Table 2.
Haizume F ormation: Loc, 55. an d Loc. 57 are si tuated nearly in the same horizon. Loc. 58 issomewhat up per in h orizon t han t he former two localiti es. The leading members of the F oraminiferanfauna f rom Loc, 55 and Loc. 57 are TI,:/;tttla?··ia sag ittul a, Quinqueloculina ~'ulgm' is , Cassidulina j Ctponica,
Globiger ina bulloides and Cibicidcs lobatulus. Cibicides ?'ejulgens is pr edom inant in Loc. 58, but Cassidulina
jap onica is n ot fou nd in it . The Foraminife ran fauna from Loc. 55 and Loc. 57 reveals a close affi nit,y with that of Klltta which YABE and HANZAw,\ reported in 1923. H ere I suggest the Klltt a assemblage to designate this faun a in the Amaze and the Nisiyama OiI ·Fields.
Nisiyama F ormation: Only one sa mple was collected, and th e F oraminife ran fauna is very sma ll
in th e n umbe r of species a nd ind ividuals.
'
Siiya For mation : T h r ee samples wer e at han d. H aplophm gmo·ides subgrobosum and Goii6ella sp. 1
are dom inan t in the ' one fr om Loc. 66 and a fe w species of Nonioni d~s, Bttlirnin-idae an d Rotali'idae a recontainecl in th e two oth ers, but the predo minant sprcies in t he H aizume Form.ation can n ot befound in t.his.
- 49 -

,J

338
Teradomari Formation : eyelam-ina paiwiloeulata is commo n.
In order t o show th e ' r elati ve abundance of differ ent fami lies in the t·h ree locali ties, L oc. 58, L oe.
55 and Loc. 57, in th e H aizum e Formation, a value is arbitr a ril y assigned to each let ter in t he ch eek
list : R= 1, O=J.O, .1\ = 20. Table 3 shows ' t he nu~nber of abundance for each fa mil y based on theseapproximate figures and t he percentage of abundance for each fami.l y in the three locali ties when
the tot al n umber of abund a nce in Loc. 57 was taken as 100. Fig. 2 A is a graphic i nt erp retat ion ofthis table. Fig. 2 B shows the r elatio nsh ip of the families in twelve localities in t h e H igasiyama andAraya F ormations of th e Higasiyama Oil Field.

-

50 -

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7J' c!:. v.~~~~?b ~f 7.> :b>, Jit~ rp'j f'i fi'iJ;f-i0J7J' G-tt!1co AT 0:1" } "::/ ( ;f8ufiifq, ~;j3i:Jifr~ ) :M~Wi c; rt-C,@-7.> c!:. v..b~ttK J: --:J-cjlj(()fij L-k?b 0) c!:. :?5'""7.> 0:j,'E-::J-ctl{~*f'i;j'I:ri¥i~t:pj;*~ J: !?
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rrf;i!I~ O§ /\**~±JI- · :&:~F.f!\%i¥fi\1l:i**I\i¥f1-f,li!§ lIlT::kiI (J~~gla9~s Cine9'el~ P&) 7.P G

2.

Palaeoloxodon na-rnadicus nc~um,ann-i (M.AKIYAM.A)*tlM;:'f'i r.11 ~JB*~~~"tl!Y+t!7KM:--eU C; n, :ffl.tE f'i~~i1f;"i\1l:i*/J'~t.x:K1*1=f. c; n -e.F.§- ~ 0

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P alaeolo.1:oclon namad'icus ?'l aurnann-i
M AKIYAMA<1)Elt:tL!l$Ri CIlfLPIfl·llii)~C 1!IlI'iIT llii )

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342./~ 4 [l;ll

Palaeoloxoclon namaclicus natlmanni MAKIYAMAx~,

On Two Teeth of Elephants found III Niigata Prefecture(R6sum ~.)By
Fuyuji 'l'AK.AI(Geological Institute, Faculty of )'cience, Impel'ia] Uuiversity of Tokyo)
As fossil elephants have not bee n known from the prefecture except S tegoclon o?-ientctlis shocloensis
d esr:ribed by H . MATSUMOTO, the present occunen'ces are of specia l interest. The one di~covered in
the Wanazu sandstone formation a t Okada, Takayanag i-mura, Karib a-gUn is Parast egoclon cf. akashiens'is and the otber foun d in tbe Oguni brown coal bearing format ion at SiZYllPPO, Tatibana-m ura,.
Naka-Uonuma-gun, is Palaeolv3;ocl vn namaclicus naumanni.
·.
In regard to tbe h orizons whicb yielded tbe fossils, the former is indical.i ve of the early Pl e i::.
stocene age and the latter of tbe late Pleistocene. Since Pleist ocene deposits are n ot very well r epresented in the region anci. opinion has generally been that the "Yanazu sandstone formation is late
Pliocen e, tbe :find of Pleistocen e mammalian r emains provides important keys for future r esearch.
Fin!!-lly it may b e noted that MATSUMOTO'S specimen may possibly be m isidentified for it appears tom e to be identical with Pamstegodon cf. i1Jcashiensis.

-

54 -

34$

Proceedings of the P a laeontological Society of Japan1l~5f1l 15 iff. 2 }J

2{ El EI *tI'&:'~i}~-E;~1{"i ] 8 leH]ll~a:Jjt~t*~*-~~~tf1lfl!!.'i'tJJ1t1.&:.~bJ':~X.§Hc1j~-cI*Hmi""
C~'Tr5/f 26 45)c fiill'i'Pi%fM:Kilj'lti'Pi:,\\lHl 3S\O):!m 1.-0
The Tertiary Foraminifera from the Mariana Islands

Sh 6shir6 H ANZAWA

On the F ossil Echinoids from the Sibi kawa Reds, Oga Peninsul a,
Akita Prefectur e

Syoz6 NISIYAMA and Kotora M. HATAI

J![~ 1:!1!!.1f0) 1:j:I'irjl t:j.1~1!t1t;r:;ilikllt1fj}J tbJ'Iff; fCffh, L*-{Ijl ifJ :ll!!.jJ i.lIt I:p~i'ill:Jl1t;r:;!liyB -1:;2F· • j( IDj~~lffiz!l)J'iJ1-

R estudy on Dionide hecto·/"·i REED fr om the Ordovicia u Formation of
New Zealand with a Note on the Classification of the Dionideidae C{·\';~).~ *m~l9.~ ~3•• ~;r:;tA O)i.lIt W.&

T eiichl KOB ,\YAS ElI* If.f Jf1x

,J'

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H isakatsu YARE and Seld6 ENDO

A New Cretaceous Cycads from Amakusa, KyusyG, J apan

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Ta kumi NAGAO an d MasHo MINATO

of Sikokll Cf\';!iit)
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Aomorl P refecture, Nor~east HonsyG C{'\,;!iit) ,Kotora M. H A'J.:.A l and ManziI'6 NAKA~mRA

An Interesting P ecten from t he Nanaki ta Beds, Nenoslraisi-m U1'a,
Manziro NAKA~mRA

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On t he Occurrence of Trigonioides i n Southeastern Manchoukuo
T eiichi KOBAY ASHI a nd K oiti Suz KT
On Some Freshw,iter Shells from t be Cretaceous Talatzu Series inSout heastern Manchoukuo

K olti SuzUJu

Nome nclat ura l Note on P oel'stella

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Kotora. M, HA'l'.AI and Shogo YA~fAMO'1'O
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Teiichi KOBAYASm and T uneo HUKASAWA

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Oonstitution of the Palaeontological Societyof Japan.
Article 1. The Society shall be known as the Palaeontological Society of Japan. It forms a sectionof the Geological Society of Japan.
Article 2. The object of the Society 'is the promotion of palaeontology and related sciences.
Article 3. This Society to execute the scheme outlined under Article 2, shall hold annual meetings anddiscussions.
Article 4. Proceedings of the Society and articles for publication shall be published through the
Journal of the Geological Society of Japan. · Separates and circulations will be sent tomembers of the Palaeontological Society who are not members of the Geological Societyof Japan.
Article 5. The annual dues of this Society is two dollars for t.he foreign members of t,he Society:
Article 6. This Society shall hold the follo wing executives. President one person, Councillors seyeralpersons.
Ar.ticle 7. The President and Councillors shall be elected annually. T he President and Councillors
shall be elected from the Society body by vote (;f its members. All elections shall be ballot.

President

Renj il'O AOKICouncillors Renjiro AOKI*RyuJi E NDO

I chiro HAYASAKA

Haruyosi HuzarOTO'

Tsullenaka IKI

Killosuke INOUYE

Nobuyasu KANEHARA

Takeo KATa

Rokuro KIMURA

Teiichi KOBAYASHI*

Hanzo MURAKAMI

Takumi NAGAO*

Shin taro NAKAM'URA

Tuneteru OINOMIKAD(l 'Ichizo O];IURA

Y anosuke O'J.lUKA"

I wao' T ATEIWA

Kyukichi \IATANABE

Hisakatsu Y ABE'"

Shinji Y AMANE*(* Executive comm ittee)

A II communications relating to this Journal should be addressed to the
PALAEONTOLOGICAL SOCIETY OF JAPAN

Geological Institute, Faculty of Science, Imperial University of Tokyo, Japan