56 591。3 55：L．763（958）

Some Cretaeeous Peleeypods from Afghanistan

by

Yukio Y’ABE＊

Abstract

Pelecypods，echinoid，ammonite，brachiopod and tetra・coral fronl Afghanistan were sent to the Geological Survey of Japan－through Dr。H．Sawata by the request of the GeologicaL Survey of Afghanistan，Royal Afghan Ministry of Mines and Industζies． Conceming the Pelecypods only，tねe writer determined their genera and speci丘o names‘as fQllows＝ 〈磁h6α4％初吻600s渉α如（SOWERBY）

加ooθ辮％％s aff。6擁zヒ％3BOEHM P’6グ0’7忽o％虎z （P）sp。．in（iet． 、

“P6・嬬”sp．．indet． L痂伽・rC卿伽θgen．etsp．indet． All of them obviously indicate the late Cretaceous period，except the i！lustrated speci－ mens under a name of P！ozo’7忽o％宛（P）sp．．If just・mentioned specimens represent actually the genus P’θ70吻㎏02z宛，this genus has a great probability represented the lower horizon than． the upPer C士etaceous，

、Int「oduction and Acknowledgements The distribution of Cretaceoug strata in the northem realm of Afgha－ nistan has been hitherto known，though玉ts detail has been scarcely reported。 Fortunately，the Afghan fossils belonging to pelecypod，echinoid，ammonite．’ brachiΦod an（i tetra－coral collected by the Geological Survey of Afghanistan， Royal Af宮han Ministry of Mines and Industries，were。sent to the Geqlogical Survey of Japan through Dr』H．Sawata who is carrying on the geolo＄ical reconnaissance in Afghani＄tan by the request of the Afghan Govemment． in ordβr to serve those for determination of the geological age・ In this、paper，the writer deals with only the pe1¢cypods representing theupP“rCretace・usperi・d，inc・nsiderati・n・f・thege・1・gicage・fthese fossils for an aid of studying th6pelecypod．fauna of Tethys sea。 At last，the writer wishes to express his sincere thanks to the Ge6一， 10gical Survey of Afghanistan，Royal Afghan Ministry of Mines and Indus－ tries for it＄ kin（i favours sending these fossils an（i offering an oPPortunity of this study to the writer．

N6tes on P鍼eontology an｛l Geology

Of the、pelecypod fossils6xamined，「the f6110wing two specific names were identified，but those of other six specimens could not be determined owing to i11－preserv母tion。 Among the determined species，加066名α郷％s伽1！σ6％s，〈吻渉h詔g％伽卿ε． 60s翻α，and their allied species are world－widely’distributed in the upper Cretaceous period，and are very effectivQ for the age determination．The geologicτange of the first．is thought to be sho茸er than that of the second・ 加06召盟卿％s枷1∫翻s and its、allied species are yielded from the Senoni4n（s，s．〉

＊ Geological Dhpartment

27一（287） 地質調査『所月報（第10巻第4号）

Name Locality N．34。860，E．67．280，N．34．860，E．67．81Q， ハ励hθα卿初卿ooos’σ如（SOWERBY＞ N．34．87。，E。67．180

動oo6劣α吻％s aff．枷1あ6％3BOEHM N．34．87Q，E．67．180

L砂加sp． N．34．860，E．67．280 ．P卿o款忽o物（P）sp．indet． N．34．820，E．67．540 （including－two spedmens） “P60惚％” sp、indet． N．34．870，E．67．180，N．34，860，E．67．28Q （including two specimens） L勿蜘86rCσ』励磁6gen．etsp．indet． N．34，860，E．67。280

to ∋》laestrichitian of Southern India， Europe， Japan， etc．漉露h6σgz房多zgz昭一 ・60s伽㍍and its allied species have・been repeatedly reporte（玉 throughout the upper Cretaceous deposits of Southern India，Southem Africa and various ・comtries of Europe，In this sense，these species seem to play an important role in the faunal relationship of the upPer Cretaceous period＆mong Europe， 、Southem Africa and Asia． The report on geology of Afghanistan in detail has been hitherto scarcely published．Acc6rding to the compiled geological map of Eurasian 、continent published in U．S．S．R．（1956），recently discovered localities of these fossHs are kept as a bla血k territory in this compiled map．Fortunately，the writer has an opportunity to read the article on the stratigraphical outline of Afgh副stan lately reported by S．PopoL and S．W．TRoM♪（1954）．Ac． ・cording to them，the Cretaceous system is widely developed from the north－ eastern to the southwestem rea1血s of Afghanistan．AmGng the Cretαceous， theSen・nian（5・1・）representsthenarr・Westdistributi・n・Regardingthe Senonian，strata，they say as follows：

Senonian and Lower Eocene beds seem to be absent in Afghanistan except in the section north of the massive Turonian limestone at Tashkurgan and below the Argane pass （20セm W。of Kunduz，in the north“astem plain）。Both micro－and macr6－fossil studies con一 五rmed our assumption in the field that the marly串ections above the massive Turonian Iimestone repr“sent a Senonian section，near Tashkurgan gradually changing into L Eocene ．gypsiferous marls． This so－called“Tashkurganseries”iscomposedofa270m thickgでey くin the sun grey）marl section near the bαse composed of white weathering gregnish marls． ．About80mabove』thebaseathinsectionofblackoilshalesoccurs．Inthelshpushtaregion， in the Central Hindu．Kushン the Turonian massive limestone are covered by brownish gr6y （greeninsun）mar1乳withsandst・neandlim曼st・neintercalatipns，．whichals・mayrepresenta、 Senonian or L．Eocene section．

As shown ill Fig．1，recently discovered fossil localities are situated at the northem and northwestem parts of Bamian in the Central Hindu Kush range，and the matrix of each fossil is composed of various colored sandstone。Therefore the approximate horizon of these fossi1＄may be in sandstone intercalation within brownish grey marls『which are assumed by them to be the Senonian or the lower Eocene．Meanwhile，when th6geolo－ gical age is inferred from these・fossils，the conclusion Will be deduced as follows l．It cannot be said frOm t恥e past studies of many authors that 漉露h6呵吻9％6・・吻㍍ranges・nly．intheSen・nian．且・wever，thege・1・gic horizon of lgcality①・（Fig．1）is thohght at least to becorrelatedtothe Arrialoor group（Upper Senonian＞of the Southem India and the upper Yezo group（from upPer most Senonian（s．s．）namely，Campanian tQ lower Mae一

28一（288） Scme Crelaceous Pe！⊂（）ypcds from Afghanistan

6〆 6860 翻 惣π 1 ηz2 乃ス3 7｝7融 ヒ u 1 5 3 斥 口1 DAUNG

RUSTAN oFAIZABAD 口

KUNDUZ JURl4τ MAZAR一 SHARIF o o 口 TASHKU届罵 ロKHANABへD xし八RGANAP」ss

塾 口 Hへ15AK

3δ

≧ 『1 SA旧HAN

71 G日0民DAN 冥 雑 口 35 A州AN KへBUL k 一 口JAしALAB〈D 馴 も 34

／ ＼

ト

ゼ 33 o MUKUR マ

→ の α 隔雄6σ 9グ吻グ6・・鋤な，／〃・6の〃螂

仔． 如あイ必5， ㌘60オ8／～” Sp。

『 ② 舵ど訪躍 9盈卿」60鋤畝∠卿グsp・， ”磁・ご8々”sp、 「！1 ③ 伽煮・かく9・吻 sp・

④ 〃3～ごカ6α 9グ吻〃6605オσ乙σ 『 O IOO ook吼’ F19．1 Map sho脚ing several localities of some Cretaceous pelecypods in Afghanistan

strichitian）of Japan，as this locality yields〈彰鋤6σ9％初卿600s観αwith． 動066耀卿％saff。わσ1あo％s。Thelocalities②and④yieldingo孕1yハ擁h6σ g漉燭鰐60吻諭mayτepresent the lower horizon than the Senonian，but the writer assumes t五ese fossils to be also the Sen6nian．丁五e locality③yield． ing pi6zo地go勉α（～）sp．may possibly represOnt the IGwer horizon than the Sen⑩an（seep．34）・

Desα直p樋on of Spec五es

，Genusハ観♂h20：DRouET，1824 Nei撒ea lquinq旺eeosねta（SOWERBY） （Platel，行gs．1～4）

1814． P66勧g％吻κ660ε∫伽s SowERBY l Mineral Conchology of Great Bri一 ．tain，Vo1．1，p．122，p1．56，figs．4～8 1846． 1σ勉辮卿伽σ％600sめ如D’ORBIGNY l Paleontologie fra．ngaise，Terra．ins cr6tac6s，VoL31p．632，p1．444，丘gs．1～5 1846． P66顔z卿初卿600ε臨！％s PlcTET et Roux l Description des Mollusques’ Fossile3，P．296，pl．45，F丘gs．3a～c 1870． P60渉6％g媚4πoo5如劾s・CREDER l Deutsche。geo1．Ges“11．Zeitsch．，Band 22， p． 232 1871． 9Vol4㈱％卿600ε渉伽，SToLlczKA l India．Geo1．Survey Mem．，Pa1。、

29一（289） lll 地質調査所月報（第10巻第4号） 曽

Indica，Cret．Fauna Southem・India，Vo1．3，p．437）p1．31，figs』 1～6；p1．38，figs．4～9 一 ・ 、

巨 1885．・〈擁h餉g％珈％ooo吻≠αWHITFIELD；U．S．Geo1．Survey Mon．9，p．．56， P1．8，丘gs．12～！4 －1903．P66伽（惚励6α）4痂卿oo吻！％s WooDs l A Mon．Cret．Lame1L Eng－ 1and，Vo1．1，p．202，p1． 39，figs．14，～171p1．40，figs．1～5，T Palaeont．Soc．London ■908．．P60痂（ハ励h召σ）9伽9観o吻加WooDs l Amals south傘frigan Mus．， VoL4，pt．12，p．’298，p1．35，fig．14 ■914． P召6彪％g％伽g％660s殉∫z‘3STEPHENsoN．ヂU。S．G，S．．Pτof。P亀per81，p。241 tabs．2～9 F1916．P66伽 9％吻％卿吻劾3GARDNER；Marylalld GeO1．・Suτvey，UpP6r Cretaceous，p．596，P1．34，血9．10 ■927．P60伽9痂卿60s鰯％s WADEl U．S』G．S．Prof．Paped37，P．64，P1． 21，．丘gs． 1～5 ユ950．地励6α9％伽9％600s！α㍍CoLLIGNoN l Annales G6010gique du Service de Mines，，Madagascar，Fasdcule NO．17，p．31 All s口eci血ehs are right valve． The test remains only in one speci－ men，and others are all internal moulds。 The right valve ovately subtrigonal e文clu＄iye of auric16s，nearly equi一 ユatera1，usually a little－higher thlan lqng，regularly－an（1．well sw611en with －very prominent umbo l・maximum“onvexity lying at about one－thirds from the umbo in the height of she11． 塗 P加6％5加S（in’mm） Height ．Len墓th ．HIL P1．1，Fig．1 52．0（ca．） 48．5（ca．） 一1．07 P1．1，Fig．一2 46．0 39，0（ca．） 1ユ8

Umbo Iocated at the middle of the she111engthジvery protruded，pointed ”beyon（i the hinge－1ine，incurved，orthogyrate or slightly prosQcline． Both －dofsal margins feebly concaved，diverging at angle・of about800． Both auri－ des qistinctly；differentiated with the discl Surfa』ce scul）tured with．five， ．．elevated，round－topped primary radials，subequal in size and intercosta1 二spacing，existi血g three or、rarely four，equal and regμlar secondaries between ．e母ch pair of primaries，but、the antero－dorsal part in Ithe disc omamente（1 ・with rather fine close．set radial ribs．Dental feature unknown． 06s6廻襯o％and R翻α嬬sJ Few specimens with poor preservation』afe ・available for the writer；they lack・external sculptures of b6th a．uricles， ユigamental and umbonal areas． M母ny authors have hitherto stated their opipioカs conceming thfs ．species，．because this species has tolerably．wide range of the variation， namely，in the’numbers，shape and interspaces of the secondary rib8． 』Unti1』the beginning of the20th Century，these factor＄h皐（i been thought to play an important role in the distinction of another species．Then，from ・the plates皿ustrated by many奪uthors，it was e琴ami血ed by the writer how many forms are there，in many specimens identified undera name of IV6歪一 ．功6σσ％吻卿660吻㍍』In this case，the writ6r neglected the above．mentioned factor＄，bec亀use SToLlczKA15）and WADE16）pointed out that tllere was little ．・regularity ip th今numbers of t五e secondary’l ribs，th6ugh the original illus一 てtrator．sowERBY13）recognized the regularity of that． Gen¢rally，four types are recognized as follows：

30一（290） Some Cret4ceous Pelecypcds from Afghanis㌃an

1）Stfaight、sh・ulder・fb・thauriclesandlessheight・ftheFshe11（HンL proportion chaれges approximately from O．96to1．08） 2） Straight shoulder of both auricles and higher height o：f the she11 （H／L口roportion changes apPrQximately from1．15to1．17）． 3）Down shoulder of both r auricles and less height of the she11（H／L、 proportion changes approximately．from1。02to1．05） 4）Down shoulder of both auricles and higher height of theP she11（H／L proportion changes approximately from1．11to1．18） Concerning the a伍nities ofハ形宛h64（1％勿zgz6600s如如，ハ兀．盟zo7万sづinstituted by PlcTET and RENEvIER（1858）and亙．g襯47づ60s菰α㍍（SowERBY）had been known in Europe and Asia，WooDs（1903）stated that the differencebetween 2V．郷o解sづand／V．卿％9％600s嬬αwasasfollows：

As a垂ule P。（ハ流．）郷gプグ魏is characterized by the relatively greater height Qf the shell てand go阜sequently smaller apical angle），by the smaller convexity of theτight valve，the rather ・strGnger main ribs，with the ribs of斐he interspaces rather more unequal in size，and lastly in ’having the area，as a rule，without ribs． The concentric omamentation agrees with．that of ．P．（〈r．）卿彫6・・吻≠％＆ 、 ’

Thewriter tried the dimensionsof H／Lproportion of WooDs7s examples of〈π．卿077鰯（p1，39，figs．11～13）represented qn the plate．As a result gf thisエneasurements，H／L proportion wa宮from122to1．26， Ac¢ordingly，it is cleafly that there is evident gap in H／しproportion between two species． ．And alsoハ【．窺o卿sづis obviously less convexed on the right valve compared with that ofハ天．g痂鰐％800s翻α．These facts call no question in the separa一 ・tion of two species．While，the question remains conc6ming two species of ．2〉．㈱耀66・s嬬ahd亙9％44枷s蜘，asp・inted・htbyST・L・czKA15）a孕d WADE16♪．The criterion for the distinction of tw6species is illustrated by WoODs as follows： ノV． 卿初卿600吻iσ 1V．9吻伽oo5渉伽 Auricles smaller 1arger Secondary ribs between fOUr three each primary Shell smεし11er relatively lafger Hinge－1ine shorter longer

Examining IV． 卿初g％600吻如from the Ripley formation of Temessee， U．S．A．，WADE indicated that the Tennessee forms are very akln to IV． ；naτロely those sizes an（i the numbers of4襯捌605渉吻illustrated by WooDs except for the posterior large auricle o：fthe secondary ribs （usually three）， ．ハi．9襯伽oo吻厩． Consequently，a sole factor distinguished from two species 置s one point of1＆rgeゆosterior auricle ln1▽．卿召伽oo吻iσby WADE’s obser－ Pvation．’Furthermore，ノV．卯初卿600吻如（pL21，figs．1，2）of the Temessee form is obviously larger posterior auricle than thqse of the SouthemrIndian， European，and African form＄． Among several speciτnens disposed by the writer，a specimen（pL I， 一Hg．1a）is very’similar to the Tennessee form and艦the another specimen ・（p1．1，丘g．4a）is rather allied to／V．g襯伽60s渉伽of WooDs，judging from ・Only itS SiZe，thOUgh thiS SpeCimen iS laterally COmpreSSed． The Afghan repre＄entations are so few in mmber thαt they offer very 曽1ittle assistance toward the sσ1ution of this problem．Among the Afghan 『form，however，the fact that there are intermediate form betwee皐ノV．卿吻． 翅660siα如andハ天．g磁4勉o吻ずαwill have to quantatively examine many

31一（291！ 地質調査所可報（第10巻第4号）

tope types of1〉1． g％6z47づ60s菰σ！α． 、 Loα～1露勿sandG6010gぎo窃1、ho惣o％」：Loc．①（Band－i－Amir，N．34．870，E． 67．18。），：Loc．②（Band－i－Amir，N．34．860，E。67．280），andLoc．④（Band－i－ Amir，N，34．360，E67．810）．May－be閣Senonian， Z）魏励痂σo％」Ootatoor，Trichinopoly，and Arrialoor groups，Southem India，England，W6stem，Northem，and、Central Ehrope，Middle and Nor－ them Syria，Pondland，Sohthem Africa，Komihevitra－Mokaraha region． Madagascar，Tennessee，Maryland，New Jersey，U。．S．A。and Mexico・

Genus乃zo60鰯解％3PARK：lsoN，1819 1noeeram虹s aff．lbaltieus BoEHM

（Plate II，figs．1a，b）

1909・ 乃zoo6耀勉錫s枷1ガ6％εBoEHM；Geologie un（i Palaontologie4er＄ubher－

1き， cynen Kreide血ulde，Abhand．d．K．preuss．geo1．Landesanst．l N．F．56，p．47，pl．11，fig．2a；p1』12，fig．1a 1912乳伽6卿灘sわα1∫翻εWooDs；A Mon．Cret。Lame1L England，Vo1．2，p。、 293，text－Hgs．51～53 1940．動06磁灘3みα1♂伽sNAGAo and MATsuMoTo；A Mon．Cretl動oo粥灘s簡 Japan，pt．2，Jour．Fac．Sci．，Hokkaido Imp．Univ．，Ser。4，Vo1． 6，No．1，p．18，p1．10，fig．1；p1．13，負g．1 1957．動，06粥耀sみα1’翻s AMANo；Upper Cret．Mo11．fro血Shimo－Koshiki一・ Jima，Kyushul K、umamoto工gur・Sci．，KumamotG Univ・，Ser・・ B，Sect．1，Vo1．2，p．57，p1』2，figs．2～4 The specime孕disposed by’the writer is a sole bivalve exhibiting in一・ temal mould。Unfortunately，in the right valve，the portion from its umbonal、 area t6the ventral is broken． Shell somewhat・inequivalve，extremely inequilateral l length greater than height；very prolonged postero－ventrally，1ike as・a genus Z3σh6z／611宛， ぺaccordingly the angle between the hinge・1ine and the line from the beak to・ the poster－ventral portion ：forming about 500ジ and that li血e runs a1口10st parallel with the posterior，moderately c6nvex except the poster卑or and the postero－dorsa1，in which are somewhat compressed．AnteriQ士and the・postero－ ventral parts brGadly’arcu3te（i l t獄e posterior margin forming an obtuse angle（6a．1300）with the hinge－1ine． In the right・valve，the antero－ventra1－ portion forms dearly inward－bending，（about900）in the juvenile stage，but that of t互e left one is『more obscure than that of the right one．Hinge－1ine・ rela．tively long． P珈郷翻S（inmm） Length Height LIH 12．6 3．6 3．5

Umbo nearly termina1，Intemal surface of the shell consis七s of very 玲r・ad，butindistinctribsandtheinterspaces，Curvature・ftheinterspace is relatiVely asymmetricaL Bifurcation of the ribs are indistinctly recognized at the several parts of the intemal surface．On the marginal part of this， specimen，rib is、obliterated． ＼ 0わs6勿痂o％J Judging from the illustration conceming t五is species by BoEHM12），WooDs18）and NAGAo and MATsuMoTo9），its characteristics will be summarized in the following respects． 1）Much elongate outline from the beak to the postero．ventral angle

32一（292） Some Cretaceous Pelecypods from Afghanistan

2）The antero－ventral portion of the shell forms distinctly’inward－ bendingl in the juvenile sta』ge 3）Becoming v6ry convex i血the a（iult sp㏄imen 4）Umbo subtermina1 5）Very broad concentric ridges、and numerous concent且c rings 6）Sometimes with th6bifurcation of the concentric ridge 7） On the marginal parts of the adult specimen ribs are obsolete or absent ’ Among these characteristics，the Afghan form is accord琴nt with the England・one in the r6spects of1），2），5），6）aηd7）．The former，however， is distinguish＆ble from the latter in having nearly te聯inal umbo and1“ss convex shelL Owing to the fact that theμmbo of this specimen is pearly 1 termina1，the curvature of its antero。dorsal margin is weaker than that of五 枷1♂伽s illustrated by WooDs（1912，p．294，丘g．51）18）and BoEHM（1907，pL11， ng．2；．p1．12，fig．1）．Furthermore，concentric rings of the m．ar3inalかart’ of this specimen3re obliterated，notwithstanding this specimen seems not to show the adult stage，judging from the measurement of WooDs’＄specimen， and also this specimen is distinctly less colnyex compared with the丘gures （text－Hgs』51，52）illustrated by Woods． From the considera七ionっf the illustration of NAGAo and MATsuMoTo， theAfghanf・misdistinguishablefr・mtheJapaneりe・nebyhaving通ess convex she11． ． WooDs pointed out that one important distinction between五みα1ガ伽3 and五伽o％吻％3was the location of umbo．The former has subterminaI umbo and the lat㌻er has・nearly teminal one．In just－mentioned』point，t五is specimen is similar to五歪錫oo％吻％s，but obviously differs from that speciesジ in the outline an（i surface sculptures of the shelL Judging from just－mentioned facts，廊e Afgha血form may represent a n6w form which is closely related to／1伽」だ6％s．As the specimen is a』sole， the writer tentatiVely identified this form with五枷1痂％5at present＄tage． 五〇〇σ吻andOθologづo召lho液o銘」Loc。①（Band－i．Amir，N．34．870，E． 67．180），Upper SenGnian，

Genus五〇φhσR61）IN611798

Lopba sp． （Plate III，figs．1a，b）

ハ侮ず6吻l」A sin宮1e，bivalve specimen with almost complete outline。 Shellmediumf。rthegenus，Pi6z・惣・痂一1ikein・utline，butitsventral aream。resw。11enthanthat・fagenusP㈱惣・％鉱C・nvexity・fb・th valvesnearlyequa1，buts・mewhatstr・ngerintheleftvalvethaninthe right。ne．Therightvalvebearspr・minent，・ccasi・nallybifurcatin弩plica” ti。nswhichdivergefr・皿br・adlyarcuatedme貸ialridget・theventra1卑argin andtheplicati・nsseemt・increasewiththegr・wth・fthesheUeitherby bifurcati。n。rbyintercalati・nlthe丘rstbifurcati・n・rigina墾esattheneigh－ b。urh。。d。fthemedialridge，andthesec・nd・ne・riginatesatweakly’ n。d。semiddlestage・fthegr・wth，th・ughth・seare．irregular・Th・sepli－ cati。nsgenerallyf・rmingsharpangulati・n（ca・500）intheventra1・buttend t。br。aderandweaker・nthep・steri・randtheanteri・rside・fthe曲¢llla maximumnumber・fplicati・n・ftherightvalvemeaSuredatthemargin is about30．

33一（293） 険

地質調査所月報（第10巻第4号） D漉鰯0％S，（inmm） Length Height 9．8 6．1

06s6吻観o％J The left valve covered with cementing material of calcareous sand，accordingly，characteristic sculpture of the shell is obscure。 S6far as the writer has observed，surface sculpture of the left valve is nearly same to that of the right．But the postero－dorsa1’part is more clearly convex Tthan that of the right（see p1．皿，fig．1b）．The umbonal area of the left valve forms irregu1母r prooess suggesting the attachmental area of the she11． 五〇〇α1めandO60Jogづoαlho漉o％」Lo¢．②（Band－i－Amir，N．34．86。，E． 67．280）．May be Senonian．

Genus P∫θzoか忽o，z毎 vAN HloEPEN，1929 Pte挙otrigo皿ia（2）sp．indet．

（Plate I，．五g．5；Plate III，fig．2）

R翻σ嬬o％渉ho8100108疹砲l ho液o％ぞRecently，the study of subfamily p伽oiπgo％i伽6was dQne by T．KoBAYAsHI and M。NAKANo7）．一According to them，among this subfamilyl a genus・p妙oご万go毎σdistributed cosmo－ politan in the ea1’1y Cretaceous，declinin墓 in Europe， but 且ourished 圭n the other regions in．the middle Cretaceous．The relic members of thi＄genus ’in the late Cr6taceous are known only from North America a血d New Zealand． Accordingly，if these specimens represent actually the gen口s Il妙o師goη宛， these specimens have a great probability representing the lower horizon than the Senonian． ．Looσ1勿：Loc．③（N．34．820，E．67．540）

“Peeten”sp．indet （Plate IV，丘gs．・，1，2）

五〇伽伽63’Loc．①（Band－i－Amir， ：N．34．870，E．67．18。）andLoc．② （Band－i－Amir，N．34．869，E．67．28。）

Reference＄

1）Amano，M：Upper Cretaceous Mollusca from Shimo－Koshiki－Jima，Kyushu，Kumamoto Jour・Sci・，Kumamoto Univ．，Ser、B，Sect。1，Geobgy，Vol．2，No．2，1957 2）Collignon，M：Recherch“s sur、1es Faunes Albiemes de Madagascar III L’Albien de Komihevitr＆，Amal．G60L Serv。Mines，、MadagasCar，Fascicule No17，1950， 3）Cox，L R： The Jurassic Lamellibranch Fama of（⊇“tch（Kachh），No．3，Families P召・吻蜘・，且卿s漁θ，蹴伽励6，五編伽，Os舵物6andT惚・繍伽（Sup－ plement），Mem。GeoL Survey India，Pa1．Indica，Ser．9，Vol．3，Pt．4，1952 4）Creder，H，H。： Die Kreide von New Jersey，Deutsche．GeoL Gese1L Zeitsch．，Band 22，1870 5）d’Orbigny，A．；Description des Mollusques et Rαyonn6s Fossiles，Paleontologie frangaise，・ Terrains cr6tac6s，Vol．3，1846 6）Gardner，J・A・：TheUpP∈rCretace・us、Dep・sits・fMaryland（Systematicやale。nt。1。gy， Upper Cretaceous，Mollusca），Maryland Geo1．Survey，1916 7）Kobayashi，T．＆Nakano，M：On the．P獅o溺8傭吻6，Jap．Jouf．Geol．Geogr．， Vo1』28プNo．4，1957 8）Naga・・T・：Cretace・usM・11uεcafr・mtheMiyak・District，H・nsh貢，」apan，」。近r．Fac． Sci・・Hokkaido Imp・Univ。，Ser．4，VoL2，No．3，1934 ～

34．一（294） Some lCretaceous Pelecypods from Afghanistan

9）Nagao，T．＆Matsumoto，T。：A Monograph of the Cretaceous盈oo6勉耀3．of Japan・ Jour．Fac．Sci．，Hokkaido Imp．Univ．，Ser．4，Vol．6，No。ユ，1940 10）Pictet，F F。」』et Roux，W：Description des Mol1μsque Fossi1“s que se trouvent dans les Gr6s Verts des Environs de Genさve，Soc．Phy．Hist．natur．Genさve，1846 11）Popo1，S。A．＆Tromp，S．W．：TheしStratigraphy and Main Structural Features of Afgh＆nistan I，Konikl．Nedr1．Akademie van Westenschappen－Amstβrdam Rep－ rinted from Proceedings，Ser．B．57，NQ．3，1g54 12）Schroeder，H．und Bρehm，」．：Geologie und Palaontologie der Subhercynen Kreidemulde， Abhand．d．k．Preuss．Landesanstalt，N．F．56，1909 、 13）Sowerby，J．1、Mineral Conchology of Gr“at Britain，VoL1，1814 14）Stephenson，L W．：Cretaceous Deposits of the Eastem Gulf Region and Species of Eπo劇昭from the Eastem Gulf Region and the Carolinas，U．S。GeoL Survey， Prof．Paper81，1914 15）Stoliczka，F．：Cretaceous Fauna of Southem India，Mem．Geo1。Survey India，PaL Indicα，Vol．3，・Nos．9～13，1871 16）Wade，B．：The Fauna of the Ripley Formation on Coon Creek，Tehnessee，U．S． Geo1．Survey，Pro五Paper137，1926 17）Whit丘e！d，R P．：Brachiopoda and Lamellibranchiata of the Raritan Clays and Gree11・ san（I MarIs of New Jersey，Mon．U．S．Geo1．Survey，Vol．9，1885 士8）Woods，H．：A Monograph of the CretaceQus Lamellibranchia of England，Vol．1，2， PaL Soc．London，1899《》1912 19）Woods，H．：The Cretaceous Fauna of Pondland，Amals South African Museum，VoL

， フ 4Pt．121908

アフガニスタン産白垂紀二枚貝類

矢 部 之 男

、要 旨

現在，アフガタニスンに滞在中の沢田秀穂の依頼により，属種名同定のため，同国産二枚貝・ ウニ・菊石・腕足貝・四射サソゴなどが送られてぎた。そのうち，二枚貝類について検討した結 果は次の通りである。 漉露hθ4σ傭鰐％600s如」α（SOWERBY） 乃zooo名研z％s aff。δσ伽6％s BOEHM P！6zo！z憩o％ズσ （P） sp。 indet．

‘‘」P80！（〃z” sp．indet． 五加、物8・rC副漁θgen．etsp。indet』 これらの二枚貝はすべて上部白璽紀を指示す『るが，P！群o♂7㎏o毎σ（P）sp．はより下位の層準を 云す可能性がある。

35一（295〉 Plate I L

ハ属観h6α卿吻9％600s鰯α（SOWERBY）…・－・………・…・………・……・……・曼2曾 ．Fig．1aArightvalveandtheposteriorFauriclesomewhatpreserved（GSJ，Reg．No． 『 5101）×1 Fig．1b Dorsal－view of sa血e spξcimen ×1 ・ ’ Fig．2a、Intemal mould of a right valve （GSJ。Reg、No．5102）×1 Fig．2b Dorsal view of same specimen ×1 Fig．3a Intemal－mould of a right valve，both auricles not preserved￥（GSJ，Reg，Nσ一 5103）×1 Fig．3b Dorsal view of same specim“n，be＆k，not preseエved ×1 Fig。4 『Deformed Iarge spccimen，posterior part rather fairly preservcd （GS工Reg・． No． 5104） ×1 P’6zo’猟磐o％毎 （P）sp．in（iet． 一・9・・一… 一・・… ；・・一一。・・・・・・… 。・一ρ・一・り。・・。・34 Fig。5 Arightvalve（GSJ．Reg．No．5107）×1

（All spεcimens here il 1ustrated are、tentatively reposited in Geological Surウey of Japan，〉 、

＼

＼

BulL Geo1．Surv． Plat6＼1 J．，VoL10，No。4 、、

曳

、

2b、 ＼

》亀

、＼

＼

N

5 Plate II

肋ooo駕郷％s aff．施漉o％s BOEHM… 32 Fig．1a Intemal mould of a left valve， characteristic “ RipPengabe】ung” 1s exhibited on the surface of the shel1． （GSJ．Reg．No． 5105）×1 Fig．1b Apical view of same specimen ×1 II瓠Bld ヲ’oN‘OI’loA‘丁入mS●lo∂｛）’Ilna Plate III

Lo墾うhαsp．爾… 。・ 33 Fig．1a Almost complete right valve （GSJ．Reg．No．5106）×1 Fig．1b Posterior view of same specimen Pi召zoず塵o吻（P）sp．indet。 34 Fig．2 1ntemal niould of a left valve （GSJ．Reg．No．5108）×1

穐 Bu1L GeoL Surv．工，VoL10，No．4 PlateIII

1a

1b Plate IV

“Po6競”sp．indet． 34 Fig．1Aleftvalve，bothauriciesnotpreserved（GSJ。Reg，No．5109）×1 Fig．2 1ntemal mould of a right valve （GSJ．Reg．No．5110）×1 Bu1L GeoL Surv．J．，Vo1．10，No．4 PlateIV

2