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Palaeontological Society of Japan Transactions and Proceedings of the Palaeontological Society of Japan New Series No. 98 Palaeontological Society of Japan J Lln e 30, 1975 Editor Takashi HAMADA Associate Editor Ikuwo OBATA Officers for 1975 - 1976 Honorary President: Teiichi KOBAYASHI Presiden t : Tatsuro MATSUMOTO Councillors (*Executive): *Kazuo ASAMA, Kiyoshi ASANO, *Kiyotaka CI-II NZEI, *Takashi HAMADA, *T etsuro HANA I, *Itaru HAYAM I, Tadao KAMEl, *Kametoshi KANMERA, *Tamio KOTAKA, *Tatsuro MATSUMOTO, Tokio SHIKAMA, Tsugio SHUTO, *Yokichi T AKAYANAG I, Toshimasa TANAI, *Hiroshi U]IlE Executive Committee: General Affairs: Tetsuro HAN AI, Itaru HAY AMI, Kiyotaka CHINZE I, Saburo KANNO, Yasuhide IWASAKI Membership: Kazuo ASAMA, Kazuhiko UEMURA Finance: Hiroshi UJIIE Planning: Tamio KOTAKA, Hiroshi NODA Publications Transactions: Takashi HAMADA, Ikuwo OBATA Special Papers: Kametoshi KA NMERA, Ienori FUJIY AMA, Tomo\vo OZAW A "Fossils": Yokichi T AKAYANAGI, Toshiaki TAKAYAMA Fossil on the cover is the six leaves in a whorl of Trizygia obLongifoLia (GERM. & KAULF.) ASAMA from the Maiya formation (ParafusuLina zone), Maiya, N. E. Japan. All communications relating to this journal should be addressed to the PALAEONTOLOGICAL SOCIETY OF JAPAN c/o Business Center for Academic Societies, Japan Yayoi 2-4-16, Bunkyo-ku, Tokyo 113, Japan Sole agent: University of Tokyo Press, Hongo, Tokyo Trans. Proc. Palaeont. Soc. Japan, N. S., No. 98, pp. 55-93, pis. 5-8, June 30, 1975 646. MIDDLE-LATE EARLY CRETACEOUS PLANTS NEWLY FOUND FROM THE UPPER COURSE OF THE KUZURYU RIVER AREA, FUKUI PREFECTURE, JAPAN* TATSUAKI KiMURA Tokyo Gakugei University, Koganei, Tokyo m*JJl!<:fLl1Ji~l:iiiE.lli!Z~;::ge~~.htc.1lfjJtIl~!II!*c,*,~f~Mtlil!Jo/.Jm';: flU,.fc EVfIHt, m*~* !!!flm;f!J5Rtt:fLl1Ji~)11 O)3Z>fr, m&cfr:}.; J: O"t,.fccfr l:iiiEl;::~tfj-t 7.J ~:EJ\11lt~m~@:}.; J: Lf-l-O)l:iiL O)~W(:E~it ~tr:lt!!~iJ' Gf~Fff-/G~O)l1ll!Jo/.J{I::.E~l*:!.R Ltc., 'i tc.:I&J6:. ~Jp{B(},:, 1l1l\ffij.!il'1.fG C C t 1;::~J1l,*,n~$:}.; J: Lf*t~cfrO)~:E~MiJ· G~:l:O)tra!Jo/.J{I::.E~ge~, l*~ Ltc. o ;:.hGtlil :fu{I::.EO)liif~"Et.e Gln;::vo~O) " fJ&tlil!Jo/.J~" 1;::1Jg-, 7.Jffi~Ht!:if-t 7.J C, "fJjll.tlil!Jo/.J~" it~ {iLlY-.n;::. :; "- '7 *c~MO):fL~~~tlil!Jo/.J~, Neocomian fJJM:}.; J: Lff,JiJtJl c ~ X. G.h 7.Jfi§ p jlllI!Jo/.Jltf (E1I&~J\11~~~1i'Y:EJ{:E1[~O)tlil:fuM) :}';J:Lf~:Etlil!Jo/.Jm';, :}';J:Lf Aptian c%'x.G.h7.Jm &cfrtlil:fu~I;::IR5t~.h7.J, ;:.hGO)tlil!Jo/.Jltfltl*J1if (m~) tlil¥!J1R (*tt, 1961, 1963) O)tllfJ$t ~ "C'if> 7.J ;: cit t ~ 7:> A., "C'if> 7.J iJ:. -l-.h:f.hl;:: --::>\, '-C iJ· t.e I) O)mJ$tl:O)!I'f:JjtiJ~~~ G.h, 'i tc. -l-.h:f.h,~~~~MO)~*tlil:fuIRO)tlil!Jo/.JWc~mJ$t~A~7.Jo~*tlil:fuIRO)1lfjM~!II!etlil:fu Wit Wealden ~"C'. -l-O)f\*~lt "f,l'lEtlil¥IlW" "C'if>I), rBiIii'l'I'IO)1lfjJtIl~!II!*c;ffil[!Jo/.JWcc t ~;::. VAKHRAMEEV 0) \" 5 l' :/ F', =:1 - P 'Y '{M!Jo/.JIR~;::IiJ~ 1..-. 1m: 1..- -Cj:rz;~~lji~~{tfr O)~lii :fuM~if>7.Jo 'ik~pM:fuW~f\*~c-t7.JI*J*M!Jo/.JIRO)M:fuW~, ~~MO)~~V7tlil:fu1R O)tlil¥IlM~;::-l-.h:f.hJ6:~"C'if> IJ, 1m: 1..- -C11['{Il£, ;@illll~Wf O)fill:fuM c ~ X. G.h 7.J 0 Ltc.iJ: '?-C l*J*tlil¥IllRlt, 1':/ F', =:1 - P 'Y /{tlil:fuIR.lli!Z,*,I;::!!Il.~ 1..- -C \" 7.J J: 5 ~O,,, X. 7.J 0 miJicfrtlil:fuMlt, ~:EJ\11W~;::~iflcll!t.e 7.J~tcfr~m~)i~iI;::£ 1..-, ~t~IYijO)1lfjM~!II!etlil:fu MO)~IHg*. tc. c x. Ii. Arctopteris, Jacutopteris t.e c~J3'tro *~"C'it, iJT;:Etlil!Jo/.JMO)~ $:}.; J: 0" [IiiJicfrtlil!Jo/.JW~;:: --::>\" -C~7JU 1..-~tc.~:flll:~;:: --::>\" -C~GjPJt-t 7.J c c t ~;::, TlIIJtJl~!II!*cO) ~* :}.; J: LfI*J*tlil!Jo/.Jlt~O)1m:~I;:: --::>\, '-C ~~tc.o Birisia onychioides It ~~ V7 tril[!Jo/.JIR1lfjM~lIE*c tlil:fuMO)lt~mJ$t~*O)~:flll:"C'if> 7.J 0 * tt :i¥ tljl mainly from the Tamodani valley, a right Introduction and Acknowledgement tributary of the Kuzuryu. This paper deals with the first palaeo­ In 1953, the writer and Y. HAYASHI botanical study of the middle to late who was a student of the Tokyo Uni­ Early Cretaceous floras in the Hida]Inner versity of Education, studied the strati­ side) Palaeofloristic Province formerly graphy of the little known Mesozoic for proposed by the writer (1961, 1963). mation exposed along the upper course The present writer is deeply indebted of the Kuzuryu, Kami-Anama-mura (now to Dr. THOMAS M. HARRIS, Professor Izumi-mura), Ono-gun, Fukui Prefecture, Emeritus of the University of Reading and collected many fossil plant fragments for his very helpful suggestions and crit­ * Received Sept. 28, 1974: Read Oct. 20, icism during the writer's stay in England. 1973 at the 112th Meeting of the Society at Financial support of this study was in Tokyo. part defrayed by the Grant-in-Aid for 55 56 Tatsuaki KIMURA Scientific Research from Ministry of The Lower Member overlies the Per­ Education, Japan. mian Group and semi-schist with un­ conformity, and the Uppermos't Member is characterised by the association of two Geology and Occurrence tuff beds, greyish in colour, 30-50 cm of fossil plants thick, and covered unconformably with quartz-porphyry and andesite flows of HAYASHI named the Mesozoic for­ later ages. mation in this area the Tamodani For­ As shown in Fig. 2, fossil plants occur mation. This formation is monoclinic in in several horizons, A-H but not the structure, inclined gently to north, and Lower and the Upper Members. Non­ is divisible into the following four mem­ marine or brackish shells, though they bers which are conformably set each are of little use as stratigraphical indi­ other: cators, are obtained from the lower part Uppermost tuff, shale and sandstone of the Middle Member. alternation In the Tetori (Tedori) Basin, the fol­ Upper sandstone lowing tuff-bearing Early Cretaceous Middle sandstone and shale alternation deposits have only been known: Lower conglomerate Mino·Shirotori·machi~ (Gifu prefecture) 0..., _""---'__ ' .--,---,hm Niguregawa valley Fig. 1. Map shows fossil localities (A-H, AI, BI, D/)along the Tamodani and the Hayashidani valleys, Izumi-mura, Ono-gun, Fukui prefecture. 646. Middle-late Early Cretaceous Plants 57 o. " ;:::, ~'.Il1/>\/>\"A"AA~I\": ...... - - 1\1\1\1\1\/'1./\ ~.-----. 1..5" Btuff ~ ~~~~,~~~~()\I'~:~~TY ...\.l-I fussil beds Fig. 2. Columnar section of the Lower Cretaceous formation exposed along the Tamodani valley, and the occurrence of fossils (T. KIMURA, 1974). Kitadani alternation of sandstone, shale MAEDA (1958), these shells (Kitadani and tuff (MAEDA, 1958); Fauna) were said to differ from the so­ Distributed along the Omichidani called Tetori non-marine shells de­ valley, a tributary of the Tetori and scribed by KOBAYASHI & SUZUKI (1936) the Takinami River,a tributary of the and to be close to those of the Nagdong Kuzuryu, overlying the thick Akaiwa Series, Southern Korea and the late sandstone, characterised by the pres­ Neocomian Wakino Subgroup, the ence of reddish or .greenish tuffaceous Kwanmon Group, Northeastern Kyu­ layers above (see Fig. 3) and by the shu. existence of the non-marine shells as Chinaboradani alternation of tuff, shale Trigonioides suzukii MAEDA, T. kodai­ and sandstone (MAEDA, 1957); rai KOBAYASHI & SUZUKI, Plicatounio About 100 m thick, overlying con­ kobayashii MAEDA, P. tetoriensis MA­ formably the Nochino conglomerate EDA, Nakamuranaia chingshanensis and sandstone, the Akaiwa sandstone (GRABAU), etc. below. According to equivalent, distributed at the upper 58 Tatsuaki KIMURA the former is not reddish or dark green­ o~r ish but rather greyish. KC . Kuwashima Sandstone & 1,'[ The geological age of the Uppermost , Shale Alternation AK ; Akaiwa Sandstone Member is presumed to be Aptian, K 1 ; Kitadani Sandstone, Shale & Tuff because in the Kitadani Formation, the Alternation Omichidani Tuff. Shale Kitadani Fauna below is similar to that o:vr ; 1000 III & Sandstone Alternation of the late Neocomian Wakino Subgroup (Upper Cretaceous) Sh Shale. S ; sandstone. (A. HASE, 1960; Y. OTA, 1960) and the C conglomerate, T ; tuff, Q quartz-porphyry, coloured tuffaceous layers above are A andesite similar in colour to the coloured pyro­ clastic layers of the Shimonoseki Sub­ AK group (so-called the Inkstone) overlying the Wakino Subgroup, and of Silla (Shi­ o ragi in Japanese) Series overlying the Neocomian Nagdong Group. ----. s If the above chronological assumption for the Uppermost Member is accepted, the Lower to Upper Member are rightly correlated with the late Neocomian Aka­ Kif iwa sandstone widely distributed in the Tetori Basin. Fig. 3. Columnar section along the Omichidani valley, Ishikawa Prefecture (after S. MAEDA, 1958). Subdivision of the so-called "Tetori Flora" course of the Uchinami and the Itoshiro The fossil plants including Arctopteris Rivers, both tributaries of the Kuzuryu, and jacutopteris, of the Uppermost Mem­ characterised by the presence of red­ ber, are quite different in composition dish or dark greenish tuffaceous layers. from those of the Akaiwa and the early Oyama Formation (MAEDA, 1957); Neocomian Oguchi Formations and that Distributed along the upper course of of the late Jurassic Kuzuryu Group_ the Itoshiro River, consisting of the Accordingly it is appropriate to treat Upper alternation of tuff, shale and them as a flora, the Tamodani Flora. sandstone Member of 30 m thick, and Recently, from several new localities the Lower sandstone and tuff Member of the Akaiwa Formation, the writer and of 47 m thick, conformably overlying his cooporators found a new fossil flora, the thin Nobudani conglomerate which the Akaiwa Flora which was fairly dif­ overlies the Palaeozoic Group with un­ ferent from the Oguchi Flora both in conformity and is characterised by the morphological characters of cycadophytes presence of reddish or dark greenish and ginkgos and in composition.
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