FUNDAMENTALS IN THE CRETACEOUS STRATIGRAPHY OF JAPAN PARTS Ⅱ＆Ⅲ

九州大学学術情報リポジトリ

Kyushu University Institutional Repository

FUNDAMENTALS IN THE CRETACEOUS STRATIGRAPHY OF JAPAN PARTS Ⅱ＆Ⅲ

Matumoto, Taturô

Faculty of Sciences, Kyushu Imperial University

http://hdl.handle.net/2324/1524094

出版情報：九州帝國大學理學部紀要 : Series D, Geology. 2 (1), pp.97-237, 1943-04-10. 九州帝國大 學理學部

バージョン：

PARTS II＆m＊

By

Tatur6 MATuMoTo

（Received Aug．1st，1942）

Contents

Part II． Stratigraphic classification of the Cretaceous deposits in   the meridional zone』of Hokkaid6 and Karahuto

  Chapter I． The true range of species… … … 98   Chapter II． Chronologic scale applicable to the Cretaceous deposits

  in the meridional zone of Hokkaid6 and Karahuto … … …135 Chapter III． Correlation and chronologic classification of the   Cretaceous deposits in the meridional zone of Hokkaid6 and   Karahuto … … … … ・・◆ … … … …155 Chapter IV． Note on fossi1−zones… … … 163 Chapter V． Classification from the standpoint of facies・develop−

  ment …  °… … …   … … … …172

Part III． Further problems

  Chapter I． Note on the palaeontologic materia1 … … … …186   Chapter II． Chronologic scale applicable to the Cretaceous de−

   posits of the Japanese Islands  …  …  …  ・・・ … 192   Chapter III． Preliminary note on the international correlation…210

98 Tatur6 MATuMoTo

      PART II

STRATl6RAPHIC CLASSIFICAT10N OF THE CRETACEOUS

       DEPOSITS IN THE MERIDIONAL ZONE OF

      ぺ

      HOKKAIDO AND KARAHUTO

    From the facts tnade available as mentioned in Part I， it is now possible to deal with the general problem of stratigraphic classi丘cation of the Cretaceous deposits in the meridional zone of Hokkaid6 and Karahuto． This classi丘cation will be done in two distinctly separate ways， one from‡he purely chronologic stand・

point， the other being a stratigraphic classi6cation from the stand・

point of facies−development． I shall begin with the former problem，

reserving the latterl for the last chapter．

        Chapter I

The T甜e Range of，Species

Introduction Basic facts Standard sections

Biostratic data from several standard sections Time・range of the important species

    1痂π）4μcηoη．   For the chronologic classification of strata the biostratigraphic method is the most useful， and the one most available， especially in the case of such richly fossiliferous depρsits as those under consideration．

    Although in biostratigraphy， subdivision of strata is usually based on differences in both the lithologic characters and the fossiLcontents， or solely on differences in the fossi1−contents， irre−

spective of lithologic characters， these empirical methods usually need reexamination as to whether or not they do exactly represent chronologic division of strata．

      

    The FossiLcontents of a formation depend on various factors

which may be grouped into three categories， namely，（1）仇θ

カる渉oちソ， （2） τ乃θ θoolρ9 c， ∫乃ε 6カo力gZq磁c， oη4 0云力εγ b oZ㎎ c血oτo烈

励cκ㎎o㎎磁s勿s，and（3）吻伽cθssθs q∫sθ蹴θ吻τ鋤α％4

プ∂ssi1 2ατ oη（ゾ仇θoZ9αηπγθ勿α仇s． Consequently， the assemblage of fossils by itself does not always directly indicate the character of a fauna or flora， nor do their successions necessarily represent their evolutional history． Through analysis and deduction， how−

ever， it is possible to recognize each of these three factors． From the observed facts， I shall now attempt to avail myself of these two methods in order to arrive at the chronologic factors affectlng the organisms and thus ascertain the true time−range of the im−

portant species， and with the aid of the knowledge gained regard・

ing their evolutional history， construct a chronologic scale．

    Bαsicヵcτs．  Before proceeding with this study it is neces−

sary to note the following basic facts：the Cretaceous deposits of the meridional zone of Hokkaid6 and Karahuto are those of a continuous area of sedimentation belonging to a single unit of a biogeographic province， the life−period of each species within the province being constant and not variable with place．

    The foregoing， however， is virtually an indisputable fact，

seeing that strata distribution are fairly continuous， and that the strata in the different localities within the area under discussion，

ignoring local and minor differences， have much in common both in stratigraphic sequence and in rock−facies． The deposits， further−

more， are mostly marine sediments， yielding everywhere similar

fossils．（1）

    From what we know of the chorology of recent and geologic times， it is recognized that organisms are distributed over a certain limited area， forming a number of biogeographic provinces through−

out the world， these arrangements of biogeographic provinces，

often changing with time， and that an organism has not necessarily the same time−range of existence everywhere， for example， appear・

ing early at one place and disappearin旨 1ate in another．（2） But within a l）iogeographic province of such extent as that under

   （1）Owing to scantiness of fossils， in this paper， the Iowest group of Mesozoic strata in the region under consideration is omitted from the exact chronologic problem．

   （2）Largely because of differences in the world s physiographic conditions and in those of evolutional phenomena of organic life， an organism does not necessarily

100 Tatur6 MATuMoTo

discussion， the apPearance and disapPearance of a species or a genus is usually contemporaneous everywher（もgeologically speaking，

provided， of course， that all the other ecological factors are constant．

    5励4励sε吻κs． With the preceding facts as basis， and from biostratigraphic studies of㎡θα1 sθc莇oηs， we can know the life−period of species， its relative duratioh， and its order in time compared with those of the different species， all of which， though，

are in connection with the province under review．

    What I call here an ideal section is that Iocality which satisfies the following conditions， namely，（1）in which there is continuous development of strata， that is， there is no break in sedimentation nor any omission of strata， owing to unfavourable structural behavior；（2）the series of strata is fossiliferous through・

out its entire thickness． The conditions of sedimentation of organic

remains and those of fossilization has been b6th constant

throughout the entire series as well as favourable for the preserva・

tion and yielding of fossils；（3） the ecological conditions of the fossil−organism were constant throughout the entire series， and if they changed at a11， the defect in record has been supplemented by processes of sedimentation and transportation of the organic remalns．

    If there is an ideal section completely satisfying all the forego・

ing conditions， the chronologic changes of organisms should show themselves directly on the succession of fossil−contents． Un・

fortunε（tely， no such ideal locality can be found in the area under consideration；there are， however， a few sections which ck）sely approach the idea1， and we can， besides， fill the con・

sequent deficiency in knowledge with data from other localities．

Suitable・sections and  localities have been  selected and their respective stratigraphies described「in detail in Part I， namely，

（1）the Naibuti district，．or the Mid−valley of the Naibuti， and adjacent area， in the southern part of Japanese Karahuto，（2）the Abesinai district， province of Tesio， northern part of middle Hok・

kaid6，（3） the so−called Isikari Coal field， especially the Siyubari district along the upper valley of the Yubari， province℃f Isikari，

central Hokkaid6，（4）near Hetonai， along the Mukawa， province

of Iburi， southern part of central Hokkaid6， and（5）near Urakawa，

province of Hidaka， southern part of median且okkaid6．

    B os〃α万gw砂砺c 4α云αノアo〃2 srακ吻γ∂sθcr o％s．  The biostrati−

graphic data necessary for solving the problem may be summarized from a description of Part I， based on observations of the standard localities just mentioned， as follows：

（1）乃θM鋤ガ4 s〃iττ．

    From the facts given in detall in Part I， we get the following Tables and charts（Table I and Figs．1−3）． The first Table gives the stratigraphic sequence and occurrence of fossils in concise form． The charts indicate clearly and accurately the stratigraphic distribution of the important species．

    Of standard sections， that of Naibuti valley comes nearest the idea1． As shown in the first Table， the fossiliferous strata have accumulated without any noticeable break， and is exposed con−

tinuously， except its lower limit， which is not exposed， owing to faulting． The deposits are mostly those of the neritic sea， the whole thickness of the Miho Group， formations Rayl， Rby， and

Rdy of the Ryugase Group， and formations Kx and Ky of the

Kawakita Group consisting of fine・gralned、sediments． Conditions were not only the most favourable for deposition and preservation of organic remains， but also the yielded fossils・are remains of marine invertabrates which are said to stand the best chances for

       づ

preservation． Considering， besides， the ecological conditions， those represented on the rock−facies are fairly constant． The sediments were formed under a similar environment which continued for a considerable period of time． If there were any differences in the ecologic distribution of organic life， owing to the pseudoplanktonic

distribution of many ammonoid shells， they did not markedly

influence the occurrence of organic remains in the sediments．

    Notwithstanding these favourable conditions， the material cannot be said to be ideal， because both the rock−facies and the mode of fossil・occurrence are not rigidly constant throughout the entire thickness， as will be noticed by the differences in the main Part of the Kawakita（｝roup from that of the Miho Group， and in

those between the Miho Group and the formations Ray2， Rcy，

Rey， and Rfy of the Ryugase Group． Since， in these cases， the

Generalized

TABLE I

stratigraphic Succession of the Cretaceous strata in the       and its adlaCent area， South Karahuto．

Naibuti Valley

9N

Stratigraphic

      Thickness

divisi°n l・nm・

Palaeogene

号30㊤の蕊日

Rfy Rey

Rdy

Rcy

Rby

Ray

50十 50一 110

90 70 270

General lithologic character

    ロ  

Conglomerate， sandstone and coal      Parallel unconformity −一 Dark coloured siltstOne or fine−sandstone

       ●

Sandstones of various degrees of coarseness， stratified， tuffa−

ceous ln part．

Dark coloured siltstone or fine・sandy mudstone， with occasional intercalation of thin marly layer and with nodules． Green sandstone is intercalated in the upPer part．

Greenish sandstone of various degrees of coarseness， including silty fine−sandstone in the upPer part．

Dark coloured 6ne・sandy mudstone with marly nodules．

Green sandstones， andesitic and glauconitic， mainly coarse and partly fine・grained（especially in the upper and the lower parts）．

      ●

Occurrence of

   fossils．

Very rare

lN°t yet disc°ve「ed

Common

Found at two horizons in the upPer part

Fairly common Common in the upPer part， rather rare in the middle， and extremely rich in ther lower

Fossil・zone

︸

Rdy 2β Rdy 1

R・y2｛：

Rby

Ray 3 R・y・

︷i． 曽q﹃O﹈≦﹀↓ご者o↓O

旨o占o田

q

コo﹄05還由≧

Mh

Mho

Kz

2700

100土

Although fossils generaUy abundant， there are fossiliferous parts and less fossiliferous ones of various dimensions in lenticular or in bed−like form． Each of these zones characterized by a certain assemblage of species．も      

Fine・sandy mudstone with nodules， bluish or greenish dark grey．

200

1G・eeni・h丘・…and・・…with ca1・a・e・u・n・d・1…i（∵認a）

Ky

¹150−300

Kx

Sandstone and shale in alternation， sandstone，

and conglomerate． Lateral change of facies iS found．       ・

Mudstone with nodules，1aterally changed to thin bedded sandstone and shale in alternation．

        1

600−4501 Shale with nodules， sandstone and shale in alternation， sandstone and conglomerate． Lateral change of facies and local erosion notable・

Kw

^200一 Greenish−grey sandstone containing carbOnaceous Hakes．

           

 （≧図︶

．

の の

＋5甘・り8嘱烏53駕勺自

︐﹄oρ誘日写︑盲雲目oで㊤a 鴬o壱．o駕﹂㊤日2boロ889壱

Φの已8・リロ自・り治浸土ω石ΦO﹂O

Lower

Ammonite

  Group   （Kv）

500十

  1

1500十

Shale or shale and sandstone in frequent alternation． Sand−

stone， sometimes tuffaceous， is intercalated．

Abundant

一一一       一一 一一

Fairly common Found  sporadically except for the upPer fossiliferous part

Common

Not  selden  found in  the  argillaceous layers

Not yet found Rare

Mh 5 Mh 4 Mh 3 Mh 2 Mh 1

MhO

Kz−Mh

Kz一ヱ

Ky

（Kx）

ρ︒冨8︒房ω胃豊σq﹃巷●冒宮ω

104 Tatur6 MATuMoTo

⑭咽「．

 ◎roロPAmm Kv

Kawakita GroUp

≦ Kx Ky Kz

M  i h o G r・o u p

冨゜

 ・昌

昌

冥ど 家宮

9F

家P _Mh 6

0α・ββ

RyugaseGroup

季・図

】≦亨

Rav Rbv Rcy Rdv q

P力夕刀砲れ2s n． sp． a∬．

｜

αヵ∬PERV． P吻批φoψyα270sεzoεκ5ε（YOIくOYAMA）

Ph▼110c臼atidae

x

      ロ セ ロ ロロロ サ テ コ ロ ロロ ず テ コ       ロラの ロロ  コ エロ テヘロ ロ ホ

P∧．θ〃φ ㎞幼KOSSMAT

   ハ々oカんy∫伽θ7αss2必γαη20sμ沈SHぷlzu

∧z．aff．乃εoπo絃72sθ

ハ「．ゐε 0ηα絃 SεぬT．  ・

N．ro〃ψプεs5醐MATUMOTO var． sμb鋤επ吻rαMAT・

乃 プ㎎・硫5n・sp・の        x

Tetragonitidae

E．9励抱蹴var．伽況㎝・ガ￠・MAT・

       ・r・・… ．鰺・一・．・．・一・一翼 五φ碧ζ）力丘杉〃お8r髭2カ7協7万（JIMBO）

一 一 一一 一一一一

コ

E．ψ㎏o μ別  五海9．ρρ留oημ〃2｛KOSSMAT）

var．功f〃幼θゴ勿MATUMOTO ^ロ・ Eφ㎏oηピ．ρψε θη5θ（YABE）

   ．  ● ●一■●●

P汐π加κbεぴθ1盈2鳶4 σた毒4 oMATUMOTO        

ノ1 47αμ4触η蓼ssαcyα（FORBES）

「−x

Gαμ4r9夕c■ητs∂ε〃sψ∫ぬτ∫μ椀σEMBO）

Gaudオ▼ceratidae

      ∠4．yo4（∀α沈42（YABE）

        ノ1．sαツo var，ρ あ㎡㎝s α o MAT．

 A．∬〃2αfκ〃2げABE）

 ロ ロ      

         var． ηた朋θ4辺（YABE）

       G． εヵμ∬ η7 μ〃2 YABE        −一．一      一

A．zyμ8α記πs￠MAT．

G．オεヵ碗1．var． o朔α αYABE

・

一

G．▽〃2sszω5ω μ幼（JIMBO）

       x

 〃 αM胞soゴ 仇8 s（KOSSMAT）x

      ト Za∬。η2 白｛吻sδMAT． x

     ロ

G．5 7泌醐var．ρ侮cゐ 7 αωMAT．

   一● ■ ■■ 一■ ■ ◆      ■ ● ■ 一

G，5Z7泌μ7η（JIMBO）

凋

x G．aa「．絃 μぱ． V．0 3α α

鷺Gs γ5α励2 var．姐αMAT、

Z．ゐoωαπoξ（JIMBO） x

PO1Ψpt▼chocera舳e

   Sω αηゴεsscα απ2（YABE）

一．．．一

Z．〃σ川Mvar．」ψoη肋MAT．

       一

      一    一  Pガ〃ψo MATUMσro ρ加鋤α斑坊（YOKOYAMA）

S．垢励ηs●MATUMαTO S．由μ5泌05 α伽sMATUMOTO

Pbらρ砂C白0αγ60〜柾7㎡μ捌1（」㎜戊 P．夕μδαη夕κSε（YABE）

±＿＿＿＿

τ㎏γ 7髭θs（ルπタピμ司αα ψsPASSY

Pbbφ∫y 〃oc」sp・

   x       、

Tu㎡1itidae  NO醜oceratidae

∧励ρo触オε5〃2飢ψψs．YABE

      x ハ々ocグ娩燐句り 元gεグμ〃2（JIMBO）

B．sεゆ朗劔μ別MATUMOTO

   ■      ●

陛γρ〃απ oo〃αs osM卿α輌（YABE｝

Sc3phitidae

Kv ^毛 Kx Ky Kz

臨鋤 加㎞MS（？）藺砺4α MATUMOTO一一一一一 P（Ry㎎αsε〃σ）ημ8α5θπsεMATUMOTO−

      ・G切 oκ06￠7α5（〜）sp． x

一一・一一

Sヒ4ρ力飽s（yεzo髭θ5）ρ化ημ5 YABE

＆（γ）μθπ μSJIMBO＋var． z￠∫加oεπ5姪YABE        S．（s．1．）ρsθμ4bαθ4μ〃倉YABE・

    冥 S．（s．L）yoηθ勧π露YAB8 丈どN・

］≦ず

印

ξ 家8 ㌣

冨

 Mh6

αα・ββ 累亨 ］≦ゲ・図く

Rav Rby Rcy Rdv ＜^O

Fig．1 Stratigraphic occurrence of the important species in the Cretaceous   deposits of the Naibuti district  Ammonoidea I

    Horizontal lines are the apparent stratigraphic ranges of species， thick lines   indicate abundant occurrence， broken lines mean that the occurrenCe of the   species in question is represented by the ill・preserved specimens which are   presumably referable to it， and dotted lines that the specimen has not   yet been discovered， but certainly existed at the time of deposition of the

しOW．

 GrouPAmm．

Kv

Kawakita Group 乏 Kx Kv Kz

M  l h o G  r o u p

家7°

【N・家﹃ 望^ヲ一 ご 家5 家見

】≦ゲい  Mhb

αα・ββ

RvugaseGroup

家？田

≦】亨

D￠∫別occγα5々os5働α i MAT       

     D．（Psεμぬ2 〃膨∫如）ノαρρη」とσYABE        一

      τ7㎎りdθsη2㏄醐㎡2ss2功ωs αωsMAT．

       一一 ^{一 一 一} ・ ．一    

Desmocefa【inae ^Dαη％sε 一一・・ ．．．・・．−^{￠s4ω批s （JIMBO｝}

      D．

Rav Rbv Rcv Rdv _＜O

家く

Pr 20sM s〜功τoγboγ↑cαYABE

一 一

｝

‥

‥一  

一 P

﹁︐︐︑

sθ〃2勧s如τκs（YABE）

D．s㎎惚 μs（FORBES）

5c白 μ彪斑ゴφカy わ吻（FORBES｝

 一一一一一一．．←←一．・・．・

品τ況θ7砲π258惚π〜朗 ＋var．σ卿sω〃2 YABE

Puzosinae

   …    …

ηφρoπ加MATUMOTO

勘描♪μ〜OS辺（ル丘SρρμZOS辺）

     一一  一 ．一．・ 、一

   肋4ψαφ60（KOSSMAT）

      コ P．（M）おん泌αωα輌σIMBO）

   ロ         ご P．（ルf）㊨oη鋤απαMAT．

  一「已一■一■●       ・ P．（M）」4ρoη泌α（YABE）

ρ卿bo εεπ25ρ42ημ42∫痴η鷺θ0lMBO）

        勘cカy∂εs幼oα）7α5cf「・∂￠ηゴ50 ゴ（STOL．）

         ×

       x        ， ノ，川仇oε苑5￠MATUMOTO

Pρα6め㎡攻o娩sMAT．

KossmaticeraUnae

  ノ〜2cob館ε5 （？）sp．     ノOcoδ∫ ￠s sp．

       x，         1．×．

cfr．励9況ηηα7碗5μηκμm（YABE｝

       ×       1

       疏κo∂ゴ5co㎡εsραρ〃ん2 μ5 （STOLJ

    1而5s〃2αf晦η3sゴθゆo別側〃8（YABE｝

      X   l κ（γbl㎏yα別ωc．昭s）∫輌幼ψo輌YABE

︸

e na

O

d15

hy C

Pa

P〜αcθπ∫↓6εγθ∫of lo〔7夕 カi group

x

Kv

×＜

ドx Ky Kz

         A ψαc妙ゴ●cμ5s〃ηεn（YOKOVAMA）

       一一一一■■一 ！1．ノ㎏ ωsrα缶〃‡（YABE｝

      コ

        〆          一一…− A，yεzoθηsゴs↓YABE）

助、励拠㌶㍑蒜L『竺二竺．二L・

C已ηo∂bcθ夕η5 Ao∫s〃昭f （YABE）■■一一＿＿＿＿

C、〃慨〃∫ωsωrμ〃1MATUMOTO    −r−■■一一・−x       勘εんy〔7ゴ5εμ5s2功60，〃ρπテ5sμs MAT， −       P已cぬ．ノαρo，ηcw5（SAITO｝ 3ト…・貿 ルf￠ημ↓ ￠s aff、η2εημ （FORBES） ＿＿＿＿

  M．ησ吻 吻∫fs MATUMOTO  x       ル7 η）fα〜〜ηoばεs（YABE）

       〃、乃μgosεηs益 MAT

1〜o〃2f2ηκθγπ∫｛？）sp

    x ハ40ガoηκεη25 sp，

   x ζ㌻N

二≦言 ζ 丈ずN 家三 家竺 ζ7  Mh6

αη・ββ

【^字・男く

】≦ご

Ray Rbv Rcy Rdv

＜O

Fig．2 Stratigraphic occurrence of the important species in the Cretaceous

106 Tatur6 MATuMoTo

LOW．

Amtn．

 Group

Kv

一 ■

Kawakita Group

沢ξ

Kx Ky Kz

×N・冨 M  i h o G  r o u・P 宮 宮 ㌣ 窓亡 家亡 累宮 Mh6

αα・ββ

萎↓

一・・＿ ∬ηoε n．sp〜cfr． bo舵〃2igκs LEONH．

RyugaseGroup

苔

Rav Rbv RCV Rdv

痴oく

ロ

＃

1n㏄eramu6

Kv

∫，60μoθπ〃↓cμs功oπぬsNAGAo＋MATuMoTo      1．ωκα川7勧sω3掘μ5N．＋M          eη泌∫7妬μ5N．＋M．

 ∫．yαカρ N．＋M．

       1．加bθ sθη5δN．＋M．

         迦γ励sCN．＋M．

       ∬．∫εsカあ朗sδN．十M．

      ξ κω可 〃昭πsδYEHARA       物ψo￠πs・MATUMOTO 1 a6．67ψSJ MANTELL

      1．α％㎞ηs砧N．＋M．

      ∫，θzoεπ5 なYOKOYAMA

∫．」4ρo 鋤sN．＋M．

∫ηocηαμ〃3αηm YOKOYAMA

    ∫．，o如夕α％ N．＋M，

1 0酩刀絃 Zsα拐占毫膨銘sN．＋M．

      ∫．SCゐカ2㎡がMlCHAEL        ∫．sα加 輌㎜5るSOKOLow

∫．ρs飽405砒鋤sN．＋M．＋var・θノ卿πs SoKoLow

×緩

Kx Kv Kz

∫．（＆鋤陥）α1％fs碗YEHARA

萎゜

×N・昌 苔μ 季冊 家亨 ま言

苔

、㌃㌧・§

忌ゲ・

Rav Rbv Rcv Rdy 2^ク0 牙^図

Fig．3 Stratigraphic occurrence of the species of 1μocθγα〃2μs in the Cretaceous  deposits of the Naibuti district．

ecologic conditions and the factors for fosSilization in formations of different lithological characters were probably dissimilar， it is not possible・to decide readily whether the marked differences in fossil・contents，・for example， between the upper part of the Miho

Group（Mh6）and the、lower part of the Ryugase Group（Ry−Mh

and Ray 1）， represents a rapid change in the evolutional history of organic life or whether it merely represents a change層in ecologic enviro叫nent． Even in the case 6f sediments of like character，

differences in the factors for distribution of organisms is possible，

seeing that some of the factors（e．g． nature of the medium， nourish・

ment，10cal currents， etc．）do not always leave their marks on the character of the sediments．

    For these reasons， the stratigraphic distribution of some of

range， may not represent the true range of species． Ambiguity and deficiency in knowledge of this kind should be satisfied with data from other sections．

（2）  丁乃θ ∠4βθsゴ％αゴ4 s》γioZ．

   Summarizing the observed facts as stated in Part I， we re−

present here in tabular form the sequence of strata， occurrence of fossils， and the stratigraphic distribution of the important species in connection with the Cretaceous of the present district（Table 2，

Figs．4−6）．

    This area is one of the standards， if not quite ideal． Generally speaking， strata of rather similar rock・facies（i．e． the Ammonite Group）are developed continuously and， except for the lower part

（Onisasi Group and Lower Ammonite Group）， are either fairly or richly fossiliferous． In the middle of the Ammonite Group， we 6nd two formations of rather different character， being what are called the Saku Formation and the Omagari Formation． Fortunate・

ly， however， the coarse・grained sedimentaries of the Saku Forma−

tion are frequently intercalated with fine−grained rocks which， in turn， have both their lithologic characters and features of fossil・

occurrence． similar to those of the proper part of the Ammonite

Group． The Omagari Formation also comprises a member con・

sisting of fine grained sediments， although this last occurS less frequently． Besides， the processes of transportation and deposition of the organic rerhains seem to have been favourable enough to

furnish us withもome data even from these formations． （Full

details will be found in the descriptions in Part I．） Consequently，

notwithstanding the minor changes in rock−facies and the inter・

mittent occurrence sQmetimes／of fossils， the Middle and Upper Ammonite Groups of the present district give us some information in connection with the chronologic occurrence of the fossil−species．

The most important data here are that（1）．we find a parallel in the Naibuti and the Abesinai districts in the range of species， the relative length of the range， and in the order of occurrence．

Examples of the species are those belonging to the Gaudry・

ceratidae， the Tetragonitidae， the Phylloceratidae， certain other ammonoid families， and 1ηocθ斑勿μs． These are mostly represented

by numerous specimens， the group occuring at every horizon．

We．are here undoubtedly dealing with．the true， or a nearly true，

戸

O

o◎

TABLE II

Generalized stratigraphic succession of the Cretaceous Strata in the Abesinai Valley and the Mid−valley of the Tesio， Northern Hokkaid6．

   Stratigraphic division

（Major）       （Minor）

Miocene

Wakkawenbetu Formation

IV． Hakobuti Group（in part）

音o﹂OΦ嵩8日已く﹄㊤合P．昌

          

 ．口O田閃日︼O﹄ 一℃閃b吻閃日◎㊤口土  ．㊤．一

                                    ⁚一﹄付q㊤一噂唱︹日

」

㊤≧〇一 ①已﹈ 口︹ 唱の﹈閃一雨O﹄㊤﹈口哨 oり唱 へ遇OO﹄ 唱Φ

・已一付﹄bO・Φの﹄㊦OO＞O ①Oロ㊤﹂﹄コOOO一賃㊤うσΦ﹂唱﹄ρ

唱㊤N唱Φ﹈O閃﹂恒口O ．起qコ 一付OO一 ﹂O ﹄O口肩§ ＞OqO口閃§﹄O唱 く  ．O﹈Φ ．句ミSミOS魁OOミ ︑ω出口O§

−已︼閃 申O ω＝o◎o◎O唱 唱口㊦ ω口O口Φ﹄OqOO 口↑工O︹﹄

oo﹈自㊤旨﹈唱㊤のooコO賃O一〇口O日▽口雨勺㊤q↑閃﹄⑭L㊤口⁝缶

IIId十e

＼

IIIC

一．一一

IIIb

IIIa

Thickness

 ln m．

6−150

Lithological character Massive sandstone， with and sandy mudstone．

cOng10merate

（Unconformity， apParent paraUe1 Sandstone

Occurrence of fossi1 Fossil−zone Kawabata fauna

Rare 150

 1

200 2000

（土）

Siltstone or very丘ne・sandy mudstone．

Greensandstone

part．

occurs in the upPer

oo

∋

ウム︵ Mudstone， with a bentonitic tuff

     1

250 1

（＋）

Greywacke−sandstone， sandy−mudstone，

and mudstone；often thick bedded in the upper part and thin bedded in the lower part； local conglomerate in subordinate amount．

9白︵oo Mudstone

Abundant

Abuudant

Not abundant

Fossiliferous bed is intercalated at several horizons．

Common， at least

111e

IIId

（IIIC）

讐ロ﹃O︼≦﹀↓己ζO弓O

（IIIb）．

IIIa

号︒占Φ＝8日§＜Φ号勺目．ロ

           

 ．

㊤．︹．岩ロコ﹄oロ唱日も口o︹甘日﹄￡口︹

             ．80．§§ミ80ミ．のΦ出8日日句も

IId

︑

IIC

（IIb−c）

IIb

IIa

400

 1

450

150

  1

300 370

250

1．Lower Ammonite Group

0．Onisasi Group

2000Ca

Thick

quent alternation predominant，

with intercalated thick bedded sandstone， mudstone， and intra・

formational conglomerate．

Mudstone， partly丘ne−sandy．

Siltstone， or fine・sandy mudstone

  Mudstone

（Comformable， but with rapid change of facies）

  T垣n bedded shale and sandstone in   alternation， shale or mudstone；with  predominant sandstone and some con−

 glomerate in the lower part．

一 （Relation not accurately investigated）−

 Older pyroclastic sedimentary rocks，

 cherts， shale and sandstone．

very abundant in some parts

Not abundant° ．／

    プ       ー

／

^︐

^／／

^Common

Abundant

  or

Common

Rare Rare

Radiolarian remains

in chert．

IId

IIC

（β，γ，）

Ilb−c    IIb     十

Uppermost

   IIa

ρ︒宮805c力吟日寓讐巷ゴ＜

H 8

110 Tatur6 MATuMoTo

︑

Low， Am．

 Group．

1

Middle Ammonite Group IIa 11b ll，；lr（；と潴1

Ud

UpPer Ammonite Group

III a IIIb UIC ^111d Hle

Pカy〃0εθ地sn． sp． aff． fα ∫「PERV．

        l

Phylloceratidae

x        ロペゆ

  、肪、ρε〃ε吻ε（MICHELIN）

     −

   Pん．ノ（ψo icμ〃2 MATUMOTO      −一一゜■一一一

o」●

∧％ρρみy わ6θη5sμb抱〃80sμ〃εSHIMロu

x・一・・

ロ の       コ    の ロコぽロ

∧τoo卯ψπss醐MATUMOTσ

Hakobuti

Gr．（P．）

lV

L

∧乙 a鉦．んε0 0絃η5ε       涛．一・s ・・．．x p海，ル〜ραc轟y㏄う惚3ε20ε sε（YOKOYAMA）

 一 一 一 一  ・ ・ ・ ．  ・」 ． ， 

7＞〃ど720力 θssp， nOV．（〜）

       一一一一

     ぐ

石油oη碗π2s g〜α力卿9（JlMBO）

Te㎏agonltidae

7＞〜夕卿ηゴθ5 （S．L）sp．

 一 一  一一一 一  一 一  一 一

、

・．．．・φ．・●・・ 一一

ε．ψbw朔var．♪励∫ε励 比αMAT・

      x β餌9．ψ留oη況7鶯（KOSSMAT）

浄，．°°

勘吻励加鹿〃α々α醐鳶汕μαMATUMOTO

・．白．、一．．．◆＾一゜°°・◆．・q．・．◆◆伺

1ψjgoη必．ρ0ρθ θηsθ（YABE）

A・勾鋤々倣5．s⑳・（F・RBES｝

一一一一■■■■■■■口国田■■■■已一一一■■■一 ノ1．，ηα∂冗ψαfα万μ〃2（BLANF．）

     一  ． Gaudrvceratidae

G醐4め1τεη5sμbεos α τ 〃‡MAT         A・， 

、4．s⑩αvar．ρ伽foco5 o αMAT．

ロ      ロ       コ     ノ1．吻αr励2（YABE）

Zβ1朗4 θso4輌ε s 5（KOSSMAT）

         コ   Z，aff．40z￠i（FALLOT）

   贋トー●一．一．・．… 4寓

      Z．加加θη5δMAT，

      x

       Z 2ηiλσθカSδ var．

      x       ・

Gαμ4グyα！抱S4ε舵Sψ↓弓ρfμ卿σlMBO）

      G．，θ頒輌∫17α缶別YABE

一一 ● ●一■■●■■●●●■■●◆ ● ■ ◆ 右■・ 一

cψ7 607 2《5MAT．

G．ノθ批↓ ．var．加●μθηcεMAT．

       G、 ，πぱvar． sμ●s〃勿ωMAT．

        へ              G．S「n 4 μ励↓hMBO）

      − G．5 7↓o 励vaLρακcδ 7辺ωMAT，

       Z．〃⑳孤 oゴ（JIMBO）

       民 η

／1ηε＞OCεγ〔7s sp．

  x

Uncoiled Ammonites

昂7抄2〃θs sp．

 x

8αεμ1 rθsoγ吻 α伝MAT． BacuUtes sp．

   ロ  コ

仇励θssp．

   x 肋竺坐（YABE）助卿、，，。、畑b。池TuM・T・

S〈『TUM°T°一一一一 「嚇脚61M④）

1

  S，ψθημs伽s（YABE）

       へ

S．4εη5 Co5rα〜κs MATUMOTO 品夕7ゴ〜μ￠S（S．S、）60S 0飢s LAMARCK

へ

烏タプ〃 s （ノぬγ花〃｛2）oα｛r2 s PASSY        x

       τ （s」．），ηo治i輌SHARPE       x

    ∧吻♪oηW5 gimb 8 s YABE       エ Sωρん漉s（｝セ〜o髭εs）♪∫αμμsYABE   S（γ）畑επ鋤sJエMBO

    −一一一一一一一一垣一一一4 S．（s．L）ρs顔ばραθ〈7μαis． YABE．

S．（s．L）yoηε〃μη輌YABE

       x    l ρ乃αζ城αημ初（YOKOYAMA）

∧倫oc7必εεπz5 Sρ加㎏〃μ〃τ（JIMBO）

      コ

βoS妙伽c脚sρ蹴icos∫α伽〃2 MAT        −        PSθμdo bε伽ε74s sp         −一一 一一一一一■一「

P↓尺yμξαs￠〃α）7ツμ幽s￠ηsεMATUMOTO

11a IIb ^{il｝； r；三部｝} IId ^IIl a 111b lII c llld 111e IV Fig．4 Stratigraphic occurrence of the important species in the Cretaceous

Low Am．

 Group．  Middle Ammonitp Group UpPe了Ammonite Group Hakobuh

Gr．（P．）

1 11a 11b 賠r，；蠕㍑li Ild     ㊨Hla 111b II1c Hld ^IIle 1V

翼 Desγ躍OCθ〃25 sp．

XZ）、 cfr鳶oss痴 MATUMσro

Desmoceratime

●  一  一

      一  一

      Sピ力品■痴

D，（Psεμ∂o況〃寧〃α）10ゆ6ηκo YABF

D．（Psθμ4δ励∫寧品）ノ幼o 〜 αva了 ωゆπ∬o MAT．

 ル㎡

D ↓P）ε〜oαηovar．ρoπ） ωcμ仇YABE

      ト Dθ例θs1 ε54α例￠si（JIMBO｝

       D．Sθ 2吻S 0 μS （YABE）

    鋤力Wεぬ（FORBES）一トー

      ・■・・．．・ふ・・●

T㎎042s〃20cθ質）吻ssμbα）s αZμsMAT

〃α況ργκεπ2sβη㎡仇i＋va了．σ㎎㌦s ε 卿YABE

P〃20s翼7ηφρoηぬ7 MATUMO↑o

Pu20sinae

       一●｝一    ．◆

      ρ 〃．）60例o o oMAT．

       胃ノ伽加姓妬…．．一 拘 力y∂ε5効oα2昭sdε泌i（STOL．）

       x仇d1。

P｛M．）●白泌αωα（JIMBO） 一 一∋ 一

ノ輌9兄bo磁娠ρ拍ημ〃躍加㎝ （jIM⑲0）

    sp

cfr・ραc動㎡δ㊨o吻s MAT．

p㎏斑ρ鷹zos辺（ル〃sOρμ20s輌め卿∂oραφ￠α（KOSSMAT）

       xκOSS醐rε佑05（s．いsp

K・s・mati・e・atlnae        Xσ）ノσcob漉s sp． nov．ρ）       「

       一」iρ9μηη07輌 ￠sμπ虻 卿（YABE） 1        −一一一一一一● 〃b〜α）∂δco㎡￠sρρρゴ〃α μ5（STOL．）

       〃ω斑θ5ω胡少πssμ∫MATUMσro

       −一一一■口●●一  ル『， 060S4司ウゐαHOμ〜εS 1』4LATU1（アro      ．

       ∧后o坊σ∂η2s輌絃5．ηψρo 佃z5 MATUMσTO

●

      一一一

一一■■●●●■ ■・◆●

Pachydi5cimξ

4，20ρ刀cんy∂岱α5s翼〜飽￠n（YOKOYAMA）

         Aカ5dωs σ 〃卿（YABE）

      ・

      ハわ碗ル漉5a飢yo妨伽α」

A．泌μ卿α肋1   −一一一一一

一

 （YOKOYAMA）お

      （jlMBO｝

Eμカα触「岱αご5〃07切α輌（JI1囎o）      

       G7館α7卿負25一］50ss卿α7i

       C 〃78 〃輌α培α2μ卿       ・

  ル牝 μぱぴa∬．卿ε 2 （FORBES）

   （YABE）

MATUMOTO ^→

M．励励鋤s（YABE）鰺＿．＿．x      ．

    M μgo∫θ s輌s MAT

買

      x Cα●τ0￠θγα5sp、β

Ac諭thoceratid3e   −■一■Acoη仇o㏄畑507励細友MATUMOTO

      x7 A、 a∬． o夕励ωルMATUMOTO       ．     ＿ ノ1．ψ加os〃例KOSSMAT        −−A・cfr・asiaticumσIM助

       一一゜◎ρ η〃頓o ∬θsαイ ，2 ㎎ o貿jvar． m7ημ σ（KossMAT）

       − Fb皆sio 力ぴ￠s ρηsjs（PERON）

         ルη川η〃；ρ；7ρ〃α；↓YABE斗S田MIzω        1        ぷ ルfbo，τκεγo∫sp      X pγ∫o， oγoρ｝5cf1・ εs加oεηss YABE＋SH．   ，       ・X °Bα〃ol∫εε7η5（1〜￠ s∫∂〃εs）7〃」 η，η〃T YABE

1 Ila        、      lllb・dIIC gllclllb      lld      l（β）      kβ一δ）1（の1

IIh ^{IIIb IIlc} IHd ^{IIIe ：1V} Fig．5 Stratigraphic occurrence of the important species in the Cretaceous

112 Tatur6 MATuMoTo

Low． Am．

 Group，

1

Middle Ammonite Group 11a IIb 咀1b・ClIlclIlc       11dl（β）  β一冷）1（α） 

1 0τε斑〃2〃ssp．

   コく  コ

    1．aκ， cγφ5j MANTELL

ルリ びびウテリ ロ

∬．￠oπcθη〃∫α 5ηφρoη 6μsNAGAo＋MATuMoTo 1，vαbτi57 bεo刀cの ア c〃sMAT

∬．yσδρ〜coηs 打c〜2 5 MAT 1yσ友 ∫ρθη9〜￠ηMAT

UPPeT Ammonite Group 111a 111b IHc 111d 111e

100ceramUS

∫励鵬 ησf， sN＋M     ∫．ρ￠ゴα〜εoηα4ε5N＋M        ぽ    フ   ∫ ε5カゆ 加sN＋M   1．んoWr5θπ5」s N．＋M

    −       ∫  ￠μ々ζ3￡〃αεηs3s OTATUME   ∬めμγ εηs，SN＋M        −一一一       1 με孤ゾ∫〃2εηs sYEHARA

       

     mCρ μs jlMBO

    −「     

Hakobuti Gr、（P．）

IV

Patd18cea

1

噌

1h ^11b 1b・『11c  llc

（β）β一δ

      （α｝ 11d

        〜oεη5岱YOKOYAMA   ノαρoηπ κ5N＋M

∫ηoc．ηα2m20η川YOKOYAMA 1γo力⑳α励2N．＋M．

     ∫鋤坊畝8M1c恥EL

        

     ∫ρ勅⑤挺吻伽sN．＋M．

        

    ∫，54cゐα ゴ解九s s SOKOLow

       −

     ∫．oγ絃㎡α 姪SOKOUDW

Sごwη刀6σ55〃α7辺（YOKOYAMA）

     ρ靴7fε∫ α（s．1）g gω1 ε（7（SCHMIDT）

11h 111b 11lc UId 111e 1V 1

F輌g．6 Stratigraphic occurrence of the important species in the  deposits of the Abesinai district−1加α｝斑〃2κs and the Patellacea

Cretaceous

range of species；（2）with the aid of the preceding knowledge it is possible to distinguish in certain other species the apParent range from the true range． For example， the vertical range． of

ρα〃2θs舵s sθ〃2 ωsオαψs，」閉αμ〃あθπzs gακ1θ〃i， and ・4ηαρα6吻4るcμs

spp． shown in the section of the Miho Group of the Naibuti dis・

trict， is only apparent， while in the strata of the Abesinai district，

these forms have a longer vertical range， probably showing the true range． The converse is true of the range of Dα〃2θs漉s 4α〃2θ5i，

shown in two districts；（3）anumber of species that either occur

namely， those of／lcαη肪ocθ74s， T％γγi1舵s（s．1．）， Dθs勿oτθ抱s， its allied form， etc． Besides， we could gain certain knowledge of the stratigraphic occurrence of these forms， such as those given in the Table；（4）the ambiguity that was pointed out in the paragraph headedτ舵1V辺bμκD sτγ元c彦， in connexion with the occurrence of fossils from the upper part of the Miho Group and the lower part of the Ryugase Group， has been clarified in the case of the present district． That iS， the assemblage of fossiIs in the Ry−

Mh＋Raylof Naibuti and the IIIe of Abesinai， and that in the Mh60f Naibuti and the IIId of Abesinai are very similar；Iitho−

logically， III e and III d have the same character， while Ry−Mh＋

Rayl and Mh6 differ． It will thus be seen that the marked

change in the assemblage of species from one horizon to the other，

in this case， is certainly chronologic， if other factors are not

absent at all． This question can be reexamined in connexion

with another district， the Urakawa， which， in turn， provides us

with additional accurate and precise knowledge． Although the

data from the present district contribute niuch・to our solution of the problem， there are still certain information lacking．（1）The uppermost part（main part of the Hakobuti Group）is absent from the present district；（2）contrary to the fossiliferous Upper and Middle Ammonite Groups， the Lower Ammonite Group is not only poor in fossils， but its rock−facies differs somewhat from that of the two groups， with the result that the question whether or not the species occuring in the Iower part of the Middle Ammonite Group extends， in its true vertical range， still further downward is yet undecided，（3）as described in detail in Part I， in the upper half of the Middle Ammonite Group， incongruence occurs between the stratigraphic succession on lithologic grounds and the sequence of fossils， this part， moreover， having local differences in rock−facies and in fossil−contents， all of which prevent exact determination of the true range of certain species．

（3）TカθsWbαγゴ磁s舵∫．

    Being、 also one of the standard sections， this one is particularly important in that it supplies the biostratigraphic data to卸l the deficiencies（2）（3）in our knowledge mentioned in the preceding paragraph．

   The stratigraphic sequence exposed in the area surveyed is

      TA肌Em

Generalized Stratigraphic Succession of the Mesozoic Rocks

         in the Si−yubari District， Central Hokkaid6．

 

忘

Major division Subdivision

1Symbol

Habobuti Group（Distributed outside of the district）

      UpPer Ammonite Group

  Dark grey mudstone or shale of lnonotonous   and homogeneous character， containing   abundant concretions and generally rich in   fossil of ammonites and抗oc〃α吻μs． Rarely   abed of calcareous sandstone and more   frequently thin layers of white tuff occur．

一（Conformable， with gradual change of facies）一      Middle Ammonite Group

Comparatively 6ne−grained sedimentary rocks predominating． Many nodules are contained． White tu任solnetimes occur as an intercalated thin layer．

The uppermost part，400 m． thick， is characterized by frequent occurrence of more coarse−grained rock， being cornposed mainly of alternating shale，

sandy mudstone and sandstone． This is the equivalent of the Saku Forma・

tion in the Abesinai district．

口O口閃ロ︼﹄O

  ^づぷ付の

七巴已駕

UpPer fossil・zone Intermediate parか Lower fossil・zone Lowest part Subdivisible account of characters．

in 6 members on detailed lithOlogicaI

      essentially        Upper       thick・

      Subdivisible on account of details in grain・size or of frequency of the intercalated thin laryes of丘ne・sandstone．

   （Gradual change of facie§）

Lithological character similar to that of the Ammonite Group． Total

ness ca 2，400 m．

IIId

lIIIC

IIIb IIIa

Thickness

  ln m．

Occurrence

 of fossils

？     Very abundant

？°

100 300

  IIS  ，

rr「

  IIq   IIp   IIn

IIm， mノ

 IIk

   IIj IIi

IIh

50 70 50 30−50

100

100（一）

  120−200

⌒

〜

         250−150

50−70 250

  Ilg ｝   Ilf

250 IIe

IId IIC IIb

450 50 400 80 500

Common

Abundant Rare Abundant

Rare 

Abundant

Not rare

①﹇q﹃O 呂﹀ぺ﹃dH≦O吋O

Comlnon Rare Not rare Not common

Common

Not rare

Common

Not comom

 Alternations of shale and sandstone or  sandstones， generally thin bedded． Sandstone  predominates in the lower part． Except for  the organic limestone in the middle part，

 very few fossils． Thickness 1300 m．

      （Conformable， at Ieast in part）

       Onisasi Group

Apeculiar group of formations composed of cherts， siliceous shales， greywackes，

tuf五te， and sandstones． Radiolarian remains occur in the cherts and siliceous shale．

Relation to the schalstein formation which is developed outside of the surveyed area not yet fully investigated

Sandst6ne and shale

Thin bedded shale and sandstone in alternatiOn

0γ梛o伽α一1imestone and丘ne sand・

stone

Thin bedded shale and fine sand・

StOne in alternation

！

Thin bedded sandstones

Siliceous shale

Andesitic greywacke and tu伍te Cherts and calcareous chert Andesitic greywacke and tuf五ite Red chert

Vitric tuff and tuff・breccia Compact sandstone and siliceous shale

Ie Id

Ic

Ib

Ia

Oz Oy Ox

60 150

100（一）

350

500（一）

350 70 1

・

Ow

Ov Ou

Ot

230 100 200 35

？°

Not yet found Rare

Abundant

Not yet found

Poor p】ant

remaln Macroscopic

fossils not yet found

ρΦ富88ωoり吟冨⇔芭①菩ぺ

116 Tatur6 MATuMoTo

LOW  Amm．

Group

Middle Amm㎝ite Gr㎝p（Main part）

1f

昌

Ub

＝

11d

昌

nf ^戸＝

口ず

口騎

11」！11k

   w x  （〉 ‡〃（胞7α5cfr．卵卿τ加s SPENGLER

（Saku Formation）

1m 11n ^口 _11q−s

Upper Ammon e Gτ．

IIla IIlb 111c 111d Na t ｛dae

Ph▼110ceオatidae

一 ■＝ 〜■ 一 ■ ■ ■ 一 ● ■  一 PAy〃ρα7ロs n． sp、 a鉦．∫α鷲 PERV．

      冗P狗．sp． cfr．

ハ々ψゐy〃促2抱ssμb朔別osμ例SHMIzu

〃￠姻0εorノαρ0 ぬ4m

P％ツ〃ψαc勧cεπ7s zoε s￠（YOKOYAMA）一一一一 x 7∀郭卿力吻cfr． 〃20 力εαπκs（MAYOR）

   1  −・一一…一一一τ祐㎎・ηぱεscfL々物耐ACOB．

T⑭。・iti由・     砂紗・』，砲』dM。。），

貿 〆1㎎卿ゴリx蹴のsp．

←  P靴2ηηαμム2酩 α鳶α3σσ々窟α方αMATUMOTO        ／1．1砺α μ〃3（YABE）

Gaudr▼ceratidae

一＿＿一一一一一

」A卿吻口・・σ。（F6・BES）

Cαμゴηめεπ2S 4顔Sερ あα μカ8（JIMBO）

     貿22如力4ぱεso4励5●（KOSSMAT）

Z．oゴ励5δvar． α∫伽拐b日碗 αMA↑， 頁

Z．cfr．初 加朗s姪MAT、

C． μ鋤〃7r 幼YABE

一一一一

為夕7輌，ゴ，εsfル〃漉〃o、 bθ寧γ‡ BRONGN・

ア，（M．）cfr， o 〃の・ IPERV  禽

Tu㎡1itidae

     理y♪o伽ηi々￠5affオμb￠7斑 ご2 μ5 rBOSC．）

      一，−

No8toceratidae．

       九m ☆εS（S．S．） cfr       鴇        7二（M）ααμμ5PASSY       x

τ．（ルのyσ励MATUMOTO

         B

、ωs α κ5LAMARCK

    l

Hamitidae

︐

80s プyc白o㏄〃7s o sμ克o輌十var．例μ ㎞5ω α（YABE）一

       X1吻加」 ε5 sp．

ノ1●oα字〃〜5sp

Polyptychoceratidae

   1

スBacωites sp．

   1

Baculitidae

        月りゆ力α耐oα！〃zs sp． indet． 寓        ●

       l

   x｛？ハ ／1η誌（脱れτssp．

S磁 ⑳ゼ εssα3加π（YABE） 一…

    S．抄θ κ5ωs（YABE） ＿一一一       

坊丘）オμbθπ〃㎡励7MATUMOTO

    l

S．〃励促κs●MATUMOTO

8αc〃〜鹿5cfr． gαμ4輌川PICTET十CAMP     −一●一一一一． ・・，・● 一

S．∂仇s妨s〜碗sMATUMOTO −一一

      勘ら少加乃α忽抱SSPP，

βα κ∫∬￠s o夕絃 α∫る MAT

一●

SCaphitidae

＆翅♪んゴrθs｛｝セ20晦s）ρ oημsYABE−＿．一＿＿．一        ロ

＆（γ）クμε打WψsJIMBO−一一一一一

       1

︽

If

      S．（s」．）yoカεたμMiYABE X S㌔fs．IJρsεμ∂bαθσwα〜∫s YABE．一＿＿＿

＝ 11ト

＝

n Hd 

＝

0 ^II，f

＝ぬ ：口 字一 ^{11」 ｜} 11k

S．（s」ぴaff S．sp，お  ．9η 〃sYABE X Imμ 11n ^戸声 IIq−s IIIa 111b IIIc IIId