On Mode the Occurrence of Nishinakayama Ammonites of in Toyora Formation, the Group By SIIIKA二岨A Tokio Although was the clarified the others, summer junior writers studied mation and T. of they HARA, K. are Mr. to researches, National OzAEI A. City Toyora for the western the Tabe Group Group part their Fault the composed of Subgroup of the district Group of Mt. is Sangun Gesan overlain unconformity contact with other northern a with area the and granitic Toyora the in the by Group and area. south and overlaps the other during T. these OKAJIMA, Yokohama the Of Y. and ways. is and into the from the about piedment Toyora the area, Group Group lS with in Rocks. to east lOOOm and is is Wakino the Toyonisbi southward, Toyora which by Metamorphic It is The in Toyora by parts Toyogatake overlain the of City, two (NW-SE). Mt. of Shimonoseki and formations thicker Thanks Group Sangun of NNE-SSW. much IIZUKA obliquely Of FuNANARUSE ETO, clin°-unconformity In the southern margln M. T. help It is divided Formation SAKAI, University T. County Rocks, T. field. and the valuable various district northern the trend becomes Basin with Kiyosue rocks general Tabe Group in National in Toyora piedmont Metamorpbic Kanmon parallel areas western GoTO Toyora Prefecture. the crosses the overlies in the of is distributed which M. T. the of results and help Miss For- KuNIKATA, and their and Aspect M. S. UMEZAWA, cooperation Yamaguchi of for Museum The kind Yokohama A. MASUJIMA GerLeral The their S. IsliIKAWA, IsliIKAWA, University for Of the Messrs. to and TANAEA, K. University, Education the researches, TANABASHI, K. the facts. new Messrs. ∫.MAI(INO, National Of to many in group Nishinakayama the some with thanks TANABE, Yokosuka the Of K. along hearty the therein. contained by (1947), and the丘eld of Japan southwest of After sedimentation paper, their University due also this Yokohama the Of of ONO stratigraphy (1968, MS.). of ammonites in KATO, the 1967 and Akira and investigated in Group Toyora the MATSUMOTO mechanism express Tokyo KANIE H. the reported Here the of paleoecology are ⅢASHI biostratigraphy writer of 1966 seasons study and Tatsuro HIRANO Acknowledgements Introduetion by IIiromichi and fault In both west thick divided each in the into 62 T. Text一丘g･ ×1-Fossil in Na the basis As age. northern the member formations, three of there Map the and and all is a the area. the are EIRANO H. fossil number. others Higashinagano, the and showing facies areas, northern 1･ locality SHIKAMA in locality Only the Nd, Ng, Nishinakayama, The here. treated 5 number Ne or Utano and Hettangian fossils indicate change. distinct difference in facies between writers deal only and with the 15 are members. Nishinakayama the Formations, to on Callovian southern Formation and in Mode occurrence of of in ammonites Up Nishinakaya皿a the Formation of the tJtano of the Nishinakayama member 63 foma七ion Na member formati on Main Ng members(Nd, Nishinakayama Ne) and of七he forna七ion T 百 (⊃ ･C〉 rl I Nsh member i;he of Eiga8hinagano forma七土on Text･丘g. 2. Tbe皿Odi丘ed column of Mode I. Previous ln 1949, lateral one this the H. YABE of side into the which been After sediments. stratum shells there, no event, were strata, more in shells (mostly calcium carbonate) one lateral the side of shall remained only seen as in Fig. 61.‖ Furtber bedding plane, that the all to width of sea ammonites ammonites such a condition ammonites were Yoshio retaining and both and Groups that the be exposed Yuji lateral stratum lateral upper to BANDO sides from an external he side in the reported the the the and the water, so impression on fact that preserved are preserved of ammonites some lnai during than which a perfectly Group, and one be may thicker not water as only was the upon stated:りThe sides the fell in time, in dissolved as bnried long a are lateral two with the destined ONUKI Toyora and and bottom of time〃. In 1959 lnai no side ascribed the of ammonites lateral the of deposited for were of in which ammonites half were water ammonite beds of shells lower sediments exposed only basis consolidation the their with where the on of the follows:りBefore as Group (1953), sedimentation forming and their fossilized this the where of buried and M. mechanism lnai of the MINATO ammonites preserved. was the sediments about noted had ammonites bottom sediments Sea Ammonites of the works discussed note, formation Nishinakayam Group. Occurrence of the of Toyora the long the fell to period preserved stated as 64 T. follows: =To a glVe observation many HIRANO E. and COnClusive cause may SBIKAMA on assumption from sedimentation they misunderstandingsりand further on Insisted brief a investigations. M. Before MINATO's in ammonites of bedding New The as the were yama no par- necessity trends the consists 1. SO be aStO on set there small were are of noticed. Specimens densicostatum H. YoKOYAMA in the with right replicas Fuciniceras Gen. et (YouNG Total cases, most the of cases, sample fortunately 23 than and part they cages in 3 varied black and part left the of which lateral side shale, consists of preserved. 8 良 BIRD) 1 1. helianihoides indet. 1, 2, and 1 1 sp. SPI sp. and upper main YoKOYAMA sp. Pseudolioceras? Dactylioceras blocks 63 bedding same 2 aff. exaraium Pseudolioceras in outer 372, 23 Though Number YoKOYAMA okadai 3). placed more sandstone alternating lie nearly Hildoceras H. (Table in Tables The Specimens Harpoceras The the on are of total partially. were block same pleCeS natural inouyei a specimens, ammonite-shells horizons Table or wholly closely regulation ammonite-bearing the Accordingly, of or sides sides the of 1). some and lateral speci- (Table sides lOmm, is, are 19 the in the丘eld. and Formation 2). planes･ both That They compaction･ than with (Table small were apart. diameters specimens of plane less The number. left lateral and right above-mentioned ammonites cut The lateral into cut writers'collection and less. to owing commonly individuals bedding with disk a preserved are both of like well bedding three The side the individual in 372 to parallel were ammonites counted other not SⅠiIKAMA its γentral with (1961) emphasized writer attain and且at retain retain blocks were thin or some or Tokio and of occurrence oplnion. ammonites 44 individuals or all 2mm as are including senior the about TAKAHASEI preserved was hand on now the of small The of MINATO's them width whorls two which replicas, among plane ammonite planes. of all natural The Eitaro theory Observation sides mens Group, ammonites lateral the an re-examination II. Toyora the (1950) reported allel with of his announcement YoKOYAMA 2 1 2 19 are Nishinaka- and the of black Mode Table ammonites in with right of occurrence of 2. Specimens natural replicas Formation left lateral and outer of Nisbinakayama the whorls sides densicostatum H. YoKOYAMA inouyei Harpoceras H･ Number sp. つ J 1 3 GEMMERARO fontanellense cf. sp. 1 helianihoides 4 1 sp. Dactylioceras Coeloceras 1 1 FucINI parodii et YoKOYAMA YoKOYAMA subjiblatum Segueniia Gen. 4 MENEGE lavinianum Fontanelliceras Grammoceras 4 BIRD) (MATSUMOTO) yokoyamai Fuciniceras Lytoceras & (YouNG cf. 1 Yo王くOYAMA afE･ exaratum Fuciniceras 9 YoKOYAMA 6 okadai Lioceraioides of preserved･ Specimens Hildoceras 5 indet. sp. 44 Total Table 3. in Case cast which and are mould the on preserved bedding same Case densicostatum YoKOYAMA & Gen. Hildoceras densicosiaium YoKOYAMA & Fuciniceras Hildoceras densicos-Eaium YoKOYAMA & H. chrysanthemum Hildoceras inouyei YoKOYAMA Hildoceras YoKOYAMA & Gen. & (YouNG aff･ exaratum et sp. inouyei & Gen. et sp. et (MATSUMOTO) & Lyioceras Lioceraioides yokoyamai (MATSUMOTO) & Gen･ Lytoceras Gen. & sp. et sp, Lytoceras indet. & a & (MATSUMOTO) sp. 1 YoKOYAMA Gen. yokoyamai aff･ Primordium 5 1 indent. 2 5 indent. & BIRD) indet. sp. Lioceratoides Fuciniceras plane･ Number Hildoceras HarPoceras 65 et et indet. sp. 2 1 sp･ sp. Gen. et 1 indet. 1 indet. sp. 1 sp, Gen. et indet. sp. 3 b. 23 Total (Fig. 2). Above shale bedding of was this are any the sea muddy In spite this plane, fact, of these formation often fossils and vertical writers bottom conditions In good several the.筆耕rrOunding the that the facies rock the place state and of keels samples rocks. is hardly where sediments muddy horizons ammonite-bearing of change assume and is very found. below and of the cavities Some during seen specimens with basis the buried were ammonites of shells are On seen. precipitated preservation parallel the period. ammonite-shells of competent between have in specimens the only ammonite lateral one 66 T. side, it seems and diagenetic less it so 2血m･ is Another those the solved away they Water in they When in buried were retained ammonite-LShells ln in such sediments･ representatives, sides despite photo- their of sides･ Formation were Dissolution Deformation In components Chemical it is Accordingly, lateral deposited･ that, other. polarized primary width like the and lateral the both and each thinned the Nishinakayama were to by other pressure here, both is that by appressed with have fact were were yields dealt ammonites noteworthy thinned each 40mm than over radius sides to appressed are lateral those as those ammonites that clear has specimens both mm, that revealed thinnes･ the HIRANO were Posidonienschiefer few a width graph that sides specimen of Liassic the a of Most H. and lateral One possible Germany, with both that pressure･ than SHIKAMA o･f shells took dis- not place is due to after diagenetic the number of the in the de- changes. The fossil fossil ammonites･ caylng process well They the death details except that they after tell may There is of little fell down to in the no south Nishinakayama of Preserved The ammonite fossils. ammonite of the width Hildoceras The identi鮎d England･ 97. 9 mm width 20. 0 mm Harpoceras Clapier, 40. 9 width 12. 1 mm aspect the at measured width ca. 35 commune (Yorkshire, England･ the mm 8mm Dactylioceras of (SowERBY) No･ 64. 3 mm 1.6. 0 mm 18ユ･8) are writers'specimens follows: Hildoceras mean valne width 辛 According densicostatum YoKOYAMA diameter of less to mean 2.OmⅡ1 than R･C･ Hildoceras 37. Ofnm MooRE, (1957) inouyei value of : Treat･ Inv･ PalリL, YoKAYAMA diameter less width and of Tokyo: SpAT王i* grecoi ca. of species diameter University the diameter values preservation of several between width the of width diameter mm band, other 1796.) toward Fossils relation stored ammonite-shells less sandy or Lioceratoides 1777･) complanatum France. No. diameter the are the died. fossils. general note These they as of more eminently margin. soon as ammonite writers that specimens bottom Ammonite is are apertural become the following No･ diameter On the of stages of preservation in bifrons HyATT (Yorkshire, (Le State or specimens of sea strata described section In this section the preceding fossils･ damage the stage The state decrease and one at ammonites･ a with comparison dissolved vertical change formation･ Horizontally'the in the of be may in few very in preserved facts are aptychus than 258pリFig･ 21.3mm 2. 0 mm 290-lab as Mode Harpoceras mean occurrence of less width Dactylioceras mean If the the the same that as densL-costatum the case case The measured case where case L･ and D. and the and mm is values of inouyei, the width bL･f,ons of the width is 2･0/7A=1/3.7. H. of The 2.0/9.2=1/4.6 2.0/4.0-1/2.0 okadai, 5,0/9.2-1/1.8 and 8mm. than mldoceras of H･ and H･ and in in the the case helianthoides. be laTge･ very belong to The of referred different species doubtful are writers less the bifrons yokoyamai, to seem widths Universlty Of Tokyo band, on 2. 0 specimens proportion bifrons complanatum grecoi is diameter H･ of H･ of it specimens, the width the commune the at 1.7.4mm tban European the densLIcostatum, in fragments preceding the assumed stored noⅦ￣ In the Harpoceras Dactylioceras of the assummed Lioceratoides of less some of of H. of the of diameter of width 5. 0 mm-In ‥ is 2･0/4･3-1/2･2 value in to (MATSUMOTO) yakoyamai value 67 YoKOYAMA values follows as mm diameters mean are get mean Formation 37.7皿m than of the values they is less as 2. 0 than diameter of width Same 31.1皿m helia71thoides value Nisbinakaya血a Lioceratoides diameter of in the am皿Onites YoKOYAMA okadai value of possibility specimens from of the such species large a dif- す feren･.ce of width, as from ranges 1/1･8 increases existent to among vertical its tectonic The ratio may be 1/1･8 said It is well to oval In the and Group･ their and degree monite not in fossils in the of the force indicating plane, however, ammonite in lateral tectonic suffer such be in the Nishibeds of with the highly shells to resistant (e. g. bildoceratids). Then, exceptional. the ratio lnai Group between it 1/2.0 view･ did not strong secondary as fossils tectonic Toyora the lateral the deformed are those of the with Group preserve Toyora the is faulted Group deformation writers shale movement of force. tectonic samples compared in Althou唱h cause few deformed are secondary a a only is small Accordingly, therein･ contained fossils and the fossil-bearing black a is ascribed Further, be may is Formation ammonites contracted ammonite lamina deformation their Shapes the the on Formation, Most other vary above consolidation to seem fossils ammonite Group. that outline of prlmary folded was fossils direction. and also may ratio Nishinakayama vertical ratio width mentioned unusal to the deposition. known lateral a an owing width The the relation as ammonite dactylioceratids Formation Nishinakayama the lnai in its the the with in only the in larger ratio Such preserved compared seen that 1/4･6 since and well a genus. them･ on becomes such Apparently 1/1.8-1/4.6 are as the their Nevertheless one-third. diameter-width that same worked about pressure the decreased pressure shrank dactylioceratids of of or diameter course fossils･ of fossils When unnatural species Formation nakayama and is half one Of it but deformation the as 1/4･6･ to proportionally･ species, with large consider Toyora the as the of seen that am- the Group did in the Inai T. 68 Sedimentary Lithologieal in Nishinakayama Ng, Nd, and Fig. 2. Pyrite deposited in differs little from gained from the remains easily which accupies reveals aragonite, other that the and are composed a such the of shells that is pr10r occurred carbonate are composed X-ray components. the retain between ammonoids shells prlmary the and many of their known, reduc- calcium nautiloids forming tO accelerated condition of of many existence and the Despite of Posidonienschiefer, the ammonoids of preservation suggests sediments marine chemical fossil of aragonite. the as total chemical hydrogen-ion the modern living the their some a sediments The where con- also Eh potential -200mV± The (1952). of pH value of such of shells of least comparison mostly case dissolution The (e.g. ostreids) mollusks the of oxygen In 99% at that However, consumption environment. dissolved. of aragoムite analys上s caused the indicate prevailed･ shown laminas. cross of shale such bottom. Ocean as black as members Na, avoid oxidation-reduction R.M. GARRELS and water in shale ■The reduction been interstitial Atlantic and the the of have of be not NW may condition may that shale facts have may 7.0-7.8 and KRtJMBEIN pH black platy ep,vli,r叩ment､ Where W.C. to according Stage in member llOrizons･ several le早Ve芦･, These of environpIFnt was concentration ing found.at an. and sandstone bedded, is thin shale are of the condition Nishinakayama comprlSeSfissile alternating black fragments many were tllRANO the of Formation gypsqm tains plant Environment and The and H. and approadl The Ne, SHIKAMA ammonoids chemical composition, which suggests pyrite, during that the the early diagenesis. Vertical lnai Group, The sea the bay of joints ln the tion be must donids*/ are and ecologlCal food-chain Seen including in the seen in the Toyora investigation the after in the scale in the Paleoecology slate of of Nishinakayama ammonites of the black Group. lithology and of examination the alterna- details. association bivalves, of in it. Utano bay. The is fossils plant area source the with leaves but Formation, less may which may we have of suggest di包cult are to posi- Except of丘sb. that than it is very Accordingly, climate scales and inoceramids, are ammonites belemnites*, of these fragments of aspect not de丘ned quantity many developed formed. in unidenti丘ed around large a Formation, studied occurring donids,-the * is on fossils by Fosgils are be should sapropel Nishinakayama Approach in they while depth developed well Which (Na), rest are The ammonites. the clarify to posh vegetation the assume yet unable humid been assuming paleo- the from Mode occurrence of Table Mean 4. of ammonites value of in diameter YoIくOYAMA Nishieakayama the Hildoceras of in Formation 69 densicostatum locality. each 9,10,ll,12 3,4,5t 6,7,8≠ Number of the of the Number Proportion total to value of diameter 5･ Table 28% 8% 43mm Mean value 54mm diameter of 7 50 80 specimens measured total number 4 22 specimens the of specimens Mean measnred of Number･ of Proportion the the of specimens Mean value these 21 58 33% 10% 10% 14% 37mm 24mm leaves the mean value And the area sandy and the 28% 16% 24% parts, the Tables those is small･ the species factors of the but may they The writers suggest that bay there located was fact the found the of are in the m'ld- of characters the by in deviation, that at exactly t･he land was in are Fragments were describe cannot that area ammonites and in value distribution these The world. southward. southern 1 to 12. of trends, assume This mean measured hand, other environment. the be 27皿皿 found The value diameters of definite no the mean 21% mrn of the 5. localities could the 20 decreases in the 2% is commonly 4 and and at than value On larger･ 15 58 mentioned. climate YoKOYAMA 12 49 15% which diameters Shows of in 41 above 15, 16 1 24mm Jurassic 25皿m 13, 14 6 25mm Hildoceras, larger mean of its diameter entrance 18mm the 9,10,ll,12 29% condition than if and become southward 26rnm 13, 14 and be the YoKOYAMA environmentlof buted to some bay 7 densicostatum must 5, and may inouyei come 21 shown smaller which broken Value are and ammonites -of localities 3, 4, mean 50 of localities at big 10CeraS 2 about is mldoceras of iOf similar.size･ northern opinion diameters of ammonites restoring 5 sedimentary Formation, diameter the the general Nishinakayama the 8 25mm and 6,7,8 i.9mm YoKOYAMA inouyei 80 specimens diameter with The of total 8 49 22 specimens the measured to total number of plant coincides measured 5 4 3,4,5 Number 15.15 41 of Hildocers locality. in each 1.3. 14 paleo- attribe_ sediments the south of the north. Conclusiop l･ served are The only appressed 2: The fossils ammonite as lateral one tp mode one of side, occurrence in the side･ and Nishinakayama Some some are preserved others carry of the ammonite Formation as only natural one fossils doe? are not replicas, lateral side. not support presome the 70 T. MINATO's solved away be may main The the at least the ln COmparison thinned tion This RELS. 5. the a in or direction the and dis- process Formation from 1/2 1/4.9. to Formation shrank thickness. Nishinakayama the was Stage 7.07.8 pH the and is assumed oxidation-reduc- to W.C. KRUMBEIN and in horizontal distribution R.M. GAR- condition. found are diameters, their Its diameter the distance YoKOYAMAI be may diagenetic Nishinakayama the prlmary of stagnant trends or ammonites sediments, shrinkage ranges Nishinakayama the according -200mV± regulation ammonites statum to Eh represents No the witll in their concentration was potential fossils of condition hydrogen-ion the of in deformation. sediments bottom sea shells buried ammonite fossilization and after considerably 4･ The fully of of HIRANO The were agency width Accordingly･ that they H. and sedimentation･ after the 3･ were on oplnion SIiIKAMA the the except decreases of entrance of densicoin perhaps the and HL'ldoceras of southward land the case relation bay. the of References ARKELL, W･J･ (1956) burgh BERNER, and A･ Robert during EINSELE, der Geol･ Akira The : 3, No. Itaru 2, (1960) ⅠⅠ, Vol･ Sec･ (1962) Jap., Wolfgang KoBAYASI-lI, 0f Teiichi KoBAYASHr, Inai T･ and Seires JapリVol. KRUMBEIN, W.C. sediments pp. Edin- in Faunas sediments 19142. pp. Fossilerhaltung Ent･ und Neues Jura. Jb. their･ and Jour. Nordwestdeut- am 447-463. pp1 Sci. Molluscan Hiroshima in Fossils Univ., Ser. Univ. Tokyo, C, Japan. in Untersuchungen Monat., Paはont. u･ Stratigraphical 567, GARRELS, and in terms of to Jour. Their Geol. Soc. T, Mesozoic the Jap. Vol. A (1940) : Southern Kitakami im Toyora Group. Gradua- in Prov. Nagato, Chu- 1-i.9. pp. New MS. 77. no. Formation 33, Posidonienscbiefer 65-68. pp. on the study University, National Species of Mountainland, fro皿 tbe Jour. Geol. Soc. Posidonia Japan, 81-83. pp, R･M･ pH Reference Provinces. Jb･ Geol･ in the Sci., Special Japanwith Biogeographical Organiscb･Chemische : Fac. Jour. 961108. pp. Yokohama 47, No. Formation and EuKASAWA, (?) 1, 277-328. on (1926) ‥ Note Jour. Geol. Soc., Japan･ goku, KRUMBEIN, (1968) the No. Schwabisschen 43, vol･ Japan. lnoceramus ⅠⅠ, pp. 797, Neues tbesi6 anaerobic within 267, Untersuchungen Rdsch･, Kyushu, Pelecypod (1･965): Hiromichi tion Ltd., 310-430. Petrographi､sche Distribution Scbwabens･ HIRANO, Boyd and 281-342. 68, No. Vol. im 3, ･pp. Mesozoic Jurassic Jurassic = sulfur Petrographie, no. Geol･ ⅩⅠⅠ,Pt. Stratigrapbical EEIノLER, : North pp. : Zur : 101, vol. Late and and Posidonienshifers (1955) Chugoku Vol. Oliver Jour. Sci., Vol. (1955) Abh･, Rudolf (1960) West - R･ des iron of Amer･ Posidonienschiefer･ schen World. the of Migration : Gestine Paはont･ u･ Ⅴ･ H･ HAYAMI, (1969) early MosEBACH, and G･ HASE, Geology diagenesisI stehung GAERTNER, Jurassic ‥ London. and (1952) : Origin and of classi丘cation chemical Geol., Vol. 60, No. 1, oxidationpotentials. Jour. (1963) and 1-33. W.C. Freeman SLOSS, and Col San L･L･ Francisco and : London. Stratigraphy Sedimentation｡ W.H. Mode Harry LADD, occurrence of S･ ed･ G,S.A., Tatsuro MATSUMOTO, Tatsuro sic Group･ Sci., Sci･ Rept･, MEISCHNER, Dieter Vol. MooRE･ G.S.A. Ⅰ, pp. ONUKI, Tadashi Iwanami-shoten, Ceratites. auf Tokyo, Invertebrate Lethaia, Japan. 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Yoshio SATO, Study Kyushu Press. Prefecture･ guchi i, pp. Province, 235-243. Ammonites･ to Epokie on Kansas Kansas Univ. and Saburo (1935) : A OISHI, γol. 2, Nagato the pp. Biostratigraphic A : in XXI, Vol. reference γol. 2, No. Treatise Treatise (1967) = Paleoecology. and History Geogr., (1947) Stratigraphy. : Univ. and 71 Formation 156-174. (1964) : ed･ Ecology Mesozoic Geol･ Perniciose : 2, pp. Late special Geol,, (1964) R･ C. Marine on Akira with (1968) 1., No. Masao MINATO, ONO, and Toyora Nisbinakayama the 67. (1949) ‥ The Japan. JapI Jour･ Southwest MATSUMOTO, Treatise (1･957) : Memoir in ammonites of R･, Evolution･ (1961) : BECK, K･C･ modern TAKAHAS町Eitaro (1951) (Yamagucbi Nagato RIA･ Some Geol･ interstitial of waters 39-73, pp, on Prefecture), Jour･ Japan. Composition : 73, vol. Notes Descriptive : Tokyo, (1965) Jour･ Geol･, sedimentsI of Asakura･shoten, BERNER, and Mesozoic Soc･ Plants Japan, from Vol･ 57, Province No･ 664, pp. 29-33. (1951) Some : (Yamaguchi TAKAHAStII, Cycadophyta Eitaro SI寸IKAMA, and is upward･ TAKAI, TEIC日ERT･ T･ Geol. Tokio (1950) 20, Vol･ and Jurassic the Jour. Soc･ ToRIYAMA, The : 36-37, pp･ R･ Toyora Japan, edi･ Series, 57, Vol. fossil ammonite Iwanami-shoten, pp. which Nagato 1911193_ venter Tokyo, Geology : (ユ･963) Prov. 668, No. Japan. Japan. Univ. of Press. Curt YocflELSON･ and Evolution･ tive ToRIYAMA･ Volume, ToRIYAMA･ Prefecture･ R･･ West Coast YoKOYAMA, (1949) Matajiro Coll･ Sci･ Geology Imp･ A Univ･ the Japan, T･ Triassic New Prefecture･ ‥ Jurassic Tokyo, Geol･ Vol. Ammonites 19, Art･ Features R･ C. Univ. Group 45, No. Nautilus Toyora 533, from Jap･ Acad‥ 20, pp･ Cephalopod Commemora_ 36, County, No･ Yanaizu, and Yama. 2471258, drift 2, pp. North γol. 25, No. Ecbizen 3-17. pp. ♪omopilius Vol･ from of MooRE Kansas. in the Geogr‥ Ammonites Proc･ Vol･ Geol. (1965) : Jap･ Jour･ Miyagi (1904) °ept. Toyora Soc･ Major : Stratigrapby･ 2, HAMADA, and : of (1967) ed･ and Geol･ of Thailand･ lsinomaki, L･ Publication : Jour･ T･ SATO, Hisakatsu near Special (1938) Ellis･ in Paleontology Essays Ryuzo guchi YABE, Science, side FMATSUMOTO, Tokyo from Japan･ Pref･) ｡n the 149-16ユ.. ｡f lnai ll. Nagato. J｡ur. Explanation 1a. Natural et 1b. 2. Pair 4･ 5･ (Hildoceras densicostatum Plate 9 YoKOYAMA) and external mould (Gen. indet･) sp･ of Natural la. (Hildocers inouyei YoKOYAMA) and external mould et sp･ indet.) Natural in a part (Hildoceras inouyei Yo壬くOYAMA) and replica Gen. (ammonite-fragments of et sp. indet･) Natural (Hildoceras inouyei YoKOYAMA) external replica and Gen･ of et sp･ indet･) Natural (Hildoceras densicostatum YoKOYAMA) replica ment 3, replica of cast of (ammonite-frag･ Gen･ -all in natural size- external mould mould (ammonite T. SHIKAMA 1b 書芸 屯,. Eirano photo, and H. HIRANO Sec. ⅠⅠ,Plate 9 Explanatiom 1. Natural least, 2. At 3. Outer 4=a. 4b 5. Natural (Harpoceras replica (ammonite Gen･ of outer whorl whorl is natural view Natural replica sp･ is of 10 (YouNG aff. exaratum and BIRD)) and external mould indet･)I natural replica replica densicostatum (Hildoceras (Hildoceras helianthoides (Dactylioceras replica γentral et Plate of densicostatum YoKOYAMA)･ 4a. (Hildoceras densicosiatum -all in natural YoKOYAMA)･ size- YoKOYAMA)･ YoKOYAMA)･ T. SHIKAMA and H. plate sec. ⅠⅠ, HIRANO I .ぺh r 10 l うふ･ ＼ .hJF a も I ∼ 4b lヽ I てI 'S ▲ % t!irano photo. Explanation 1a External mould of left且ank 1.b External mould of right lc Fragment ld γentral 2 3. of Outer natural (Harpoceras view of natural is natural (Y.OKOYAMA)), okadai flank. between replica whorl ll Plate of replica of (ammonite-fragment replica (Lioceratoides (Lytoceras sp･) lb. and (1.c). (Hildoceras replica mould Natural la Gen･ et inouyei YoKOYAMA) and external indet.). sp･ (MATSUMOTO)) yokoyamai and mould external ･ 4･ 5a･ Natural Outer of 5b. Pair (Grammoceras cast whorl Gen･ of et is sp･ natural replica sp･) and external (Grammoceras indet･)･ 5b. -all in natural size- (Grammoceras mould sp･) and external sp.) mould on it. (ammonite T. SHIKAMA H. and γ'y:ご鞠.ち.＼ ＼亀 Sec. HIRANO ∼.∼ 翠 1a ヽ. 1 し 鞘:I ヽし さ ヾこヽ ＼L､ ヽ､ゝ ヽ ヽ I ㌔ I. t 1i､ r) -ll 才才 ∼ ､1 i;:7も号 ?′譲与･/A.; もit lI; J!,L■-ら <”% ㌔ 1 ∼ 鰭 i.よ tf脊 tIヽ %j ､! 毛､･ゝ､. 1b [;..t車 :チ :iも二 ∴㌔.ir車i= ･‥三き竃 ∼ 守 'Y ヾ ＼ / ,A lーヽ ㌔ ナ1 F ヽ ノ ㌧ ＼ t､ニ薫琴.i 誇 ∼ *J '# ㌦■叫､ /.J ＼､' I. さ I ゝ■■ ∼ I; 1Ett 1c Hirano photo, ⅠⅠ,Plate ll
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