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Heteromorph Ammonite) from the Title Lower Cretaceous Hanoura Formation in Tokushima Prefecture, Japan( Fulltext )

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Heteromorph Ammonite) from the Title Lower Cretaceous Hanoura Formation in Tokushima Prefecture, Japan( Fulltext ) A large Shasticrioceras (heteromorph ammonite) from the Title Lower Cretaceous Hanoura Formation in Tokushima Prefecture, Japan( fulltext ) Author(s) MATSUKAWA,Masaki; ISHIDA,Keisuke; OBATA,Ikuwo Citation 東京学芸大学紀要. 自然科学系, 65: 35-40 Issue Date 2013-09-30 URL http://hdl.handle.net/2309/134191 Publisher 東京学芸大学学術情報委員会 Rights Bulletin of Tokyo Gakugei University, Division of Natural Sciences, 65: 35 - 40，2013 A large Shasticrioceras (heteromorph ammonite) from the Lower Cretaceous Hanoura Formation in Tokushima Prefecture, Japan Masaki MATSUKAWA*, Keisuke ISHIDA** and Ikuwo OBATA*** Department of Environmental Sciences (Received for Publication; March 28, 2013) MATSUKAWA, M., ISHIDA, K. and OBATA, I.: A large Shasticrioceras (heteromorph ammonite) from the Lower Cretaceous Hanoura Formation in Tokushima Prefecture, Japan. Bull. Tokyo Gakugei Univ. Div. Nat. Sci., 65: 35-40 (2013) ISSN 1880-4330 Abstract A large heteromorph ammonite specimen from the Hanoura Formation in the Katsuuragawa Basin is described as Shasticrioceras intermedium Matsukawa and Obata, 1993 herein. The new record expands the distribution of the species within the southwestern area of Japan. Key words: Large heteromorph ammonite, Shasticrioceras intermedium, Barremian, Hanoura Formation, Tokushima Prefecture, Japan Department of Environmental Sciences, Tokyo Gakugei University, 4-1-1 Nukuikita-machi, Koganei-shi, Tokyo 184-8501, Japan Introduction Only a few large specimens of S. patricki from the Sanchu Cretaceous (Obata and Matsukawa, 1984; Matsukawa and The heteromorph ammonoid genus Shasticrioceras Obata, 1993), S. nipponicum (Matsukawa and Obata, 1993) Anderson, 1938 is one of the North Pacific elements of and S. intermedium (Matsukawa and Obata, 1993) were ammonoid fauna, and suggests a cold current indicator. surely reported. They are over 110 mm in diameter, with a Up to date, seven species, Shasticrioceras poniente, S. loosed spire. The size of specimens probably is influenced by hesperium, S. whitneyi and S. inflatum (Anderson, 1938) and preserved conditions. S. patricki (Murphy, 1975) from the West Coast of North We identified a large specimen of heteromorph ammonite America as topotype (Anderson, 1938), and S. nipponicum named as Shasticrioceras intermedium occuring in the and S. intermedium from Japan as topotype (Matsumoto, Hanoura Formation in the Katsuuragawa Basin in Shikoku, 1947; Matsukawa and Obata, 1993), were described. Japan (Fig. 1A, B, C). So, we describe the large specimen of Generally speaking, these species excluding S. nipponicum Shasticrioceras intermedium herein. are large in size. Rich occurrence of small specimens of S. nipponicum have given an impression that Japanese Shasticrioceras is smaller than those of North America. * Department of Environmental Sciences, Tokyo Gakugei University, Koganei, Tokyo 184-8501, Japan ** Laboratory of Geology, Tokushima University, Tokushima, 770-8502, Japan *** Fukada Geological Institute, 2-13-12 Hon-Komagome, Bunkyo-Ku, Tokyo, 113-0021, Japan － 35 － Bulletin of Tokyo Gakugei University, Division of Natural Sciences, Vol. 65 (2013) MATSUKAWA et al.: A large Shasticrioceras (heteromorph ammonite) from the Lower Cretaceous Hanoura Formation in Tokushima Prefecture, Japan Geological setting (K. Ishida, Coll.), found at Nakagoya, Kamikatsu-cho, Tokushima Prefecture, from the muddy sandstone bed of the According to Matsukawa and Eto (1987), the Lower Hanoura Formation. It is external cast of shell. Cretaceous strata are distributed in the northern and southern Dimension (in mm; see Matsukawa, 1988 Fig. 4 for belts of the Chichibu Belt. They are separated by the pre- explanation of symbols used) Cetaceous formations between them. The strata in the Specimen Dn Dx H W W/H Un Ux northern and southern subbelts differ in the litho- and bio- TGUSE-MM 6064 184.0 96.6 24.2 0.25 77.6 facies. The strata of the northern subbelt can be divided into One volution earlier 79.1 26.2 5.2 0.20 40.4 four formations, the Tatsukawa, Hanoura, Hoji and Fujikawa formations, and those in the southern subbelt into three, the Description. See Matsukawa and Obata (1993). Shobu, Mamidani and Nakaizu formations in ascending order Remarks. The present specimen is almost the same size as (Fig. 1D). the holotype of the present species; the former is 184 mm in The present specimen occurred in the Hanoura Formation diameter and the latter is 195 mm. The ribs of the adult stage at Nakagoya, Kamikatsu-cho, Tokushima Prefecture. From of the present specimen are more sinuous than those of the the occurrence of Barremites (B.) difficilis, Crioceratites holotype. (Paracrioceras) asiaticum, Shasticrioceras nipponicum The narrow whorl of the present species is similar to that and others, the Hanoura Formation is assigned a Barremian of Shasticrioceras hesperium Anderson (1938, p. 204-205, age. pl. 56, fig. 1, 2; pl. 68, fig. 3). However, the present species is characterized by rapid expansion of shell height with growth. Systematic description Thus, this character differs from that of Shasticrioceras hesperium Anderson (1938, p. 204-205, pl. 56, fig. 1, 2; The illustrated ammonoid is deposited in the Department pl. 68, fig. 3), the latter being characterized by gradual of Environmental Sciences, Tokyo Gakugei University, expansion of shell with growth. Tokyo (TGUSE-MM). In general, morphological Occurrence. Barremian. terminology follows Arkell et al. (1957), and adjectives used in the description are in accordance with the definitions of Concluding remarks. A large heteromorph ammonite Matsumoto et al. (1988). Measured parts of specimen are specimen from the Hanoura Formation in the Katsuuragawa exemplified by the following symbols (Matsukawa, 1988): Basin is identified as Shasticrioceras intermedium Dn = minimum diameter of loose spire; Dx = maximum Matsukawa and Obata, 1993. This is one of the members diameter of loose spire; H = whorl height in maximum of the Japanese Barremian ammonite fauna, and is also diameter of loose spire; W = whorl width in maximum one of the members of the North Pacific elements of the diameter of loose spire; W/H = ratio of whorl width and ammonoid fauna. The species indicates a cold current whorl height; Un = minimum umbilical gap; Ux = maximum indicator (Matsukawa and Obata, 1993). The species was umbilical gap. originally reported from the Barremian Arida Formation in southwest Japan. The species was originally reported from Order: Ammonoidea von Zittel, 1884 the Barremian Arida Formation in southwest Japan. Its Suborder: Ancyloceratina Wiedmann, 1966 distribution is now expanded further to the southwest, where Superfamily: Ancylocerataceae Gill, 1871 it may also have been influenced by cold water. Family: Ancyloceratidae Gill, 1871 Subfamily: Crioceratitinae Gill, 1871 Acknowledgement. We thank Prof. Peter F. Rawson and Genus: Shasticrioceras Anderson, 1938 Dr. Jim Haggart for critical reading of the manuscript and to 1976. Shasticrioceras sp., Obata and Ogawa, pl. 1, fig. 5. give useful comments for the study. 1993. Shasticrioceras intermedium, Matsukawa and Obata, p. 258-261, text-fig. 5. Material. A single specimen, TGUSE-MM 6064 － 36 － Chichibu Belt Lithostrat. Column # Age units A Lithostrat. Column # Age units F. N F. Northern subbelt of the Cretaceous Terrane Albian Fujikawa Albian Southern subbelt of the Cretaceous Terrane Fujikawa 0 2 km $$ F. Rokujuhbu Kiwada F. Yokosekose 25 Uguisu Fukukawa 䂥 Mt.Kase 19 Hoji Hohji Hoji 48 44 45 ● 33°55′33°55′N Nakagoya 134°30′E134°30′E 䂥 Aptian 19 䂥 Aptian 38 SugiyamaSugiyama 50 19 Katsuura R. F. Taniguchi F. 䂥 Early Cretaceous ● 4052 Tanano Ta tsugatani 59 䂥 Early Cretaceous ● 55 4052 － Yanagidani Ikumi Hiura 7 Ta tsukawa 3 30 䂥 Hanoura Ochiai － Hanoura 80 Tsukigatani F. 55 Fukuhara Barremian 䂥 012km Asahi Nakaizu F. 82 Barremian 81 䂥 44 Fujikawa Formation Hoji F. 䂥 Mamidani 48 46 tsukawa IwaidanIwaidanii Hanoura F. Key Ta tsukawa F. Ta 48 Sugichi Haut. 46 Nakaizu F. 46 60 64 Mudstone Mamidani F. 300 tsukawa s (heteromorph ammonite) from the Lower Cretaceous Hanoura Formation in Tokushima Prefecture, Japan Tokushima (heteromorph ammonite) from the Lower Cretaceous Hanoura Formation in Alternating beds of Shobu F. sandstone and mudstone Key Ta 䂥 Serpentinite Haut. Muddy sandstone 䂥 Pre-Cret. 68 Mudstone Uchiyama 0m Sandstone300 60 fault s 66 Alternating beds of 57 Ta kegatani Conglomerate sandstone and mudstone % Momiji R. Fossil horizon and locality Muddy sandstone Pre-Cretaceou Shasticrioceras Pre-Cret. fms. 0m Sandstone & Conglomerate % Fossil horizon and locality Pre-Cretaceou Fig. 1 (Matsukawa et al.) Pre-Cret. fms. et al.: A large large A et al.: Fig. 1. Ammonite locality of the Katsuuragawa Basin, Tokushima Prefecture, Shikoku, Japan. A: Map showing the Katsuuragawa Basin in east Shikoku, B: Map showing the Lower Cretaceous distribution in the Katsuuragawa& Basin, C: Ammonite locality # 4052 and route of geological columnar section # 19 on the Geological map. Geological map cited from Matsukawa and Eto (1987), D: Geological columnar section #19. The columnar Fig. 1 (Matsukawa et al.) section #19 is referred from Matsukawa and Eto (1987). MATSUKAWA (2013) 65 Bulletin of Tokyo Gakugei University, Division of Natural Sciences, Vol. Vol. Division of Natural Sciences, Gakugei University, Tokyo Bulletin of Bulletin of Tokyo Gakugei University, Division of Natural Sciences, Vol. 65 (2013) MATSUKAWA et al.: A large Shasticrioceras (heteromorph ammonite) from the Lower Cretaceous Hanoura Formation in Tokushima Prefecture, Japan Fig. 2．Shasticrioceras intermedium,
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