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Palaeontological Society of Japan ISSN 0031-0204 Transactions and Proceedings of the Palaeontological Society of Japan New Series No. 165 Palaeontological Society of Japan April 30, 1992 Co-Editors Tsunemasa Saito and Kei Mori Language Editor Martin Janal (New York) Editorial Board Kunihiro lshizaki (Tohoku University), Yukio Isozaki (Yamaguchi University), Tomoki Kase (National Science Museum), Itaru Koizumi (Hokkaido University), Yasumochi Matoba (Akita University), Kei Mori (Tohoku University), Hiroshi N oda (University ofTsukuba), Tsunemasa Saito (Tohoku University), Yokichi Takayanagi (Ishinomaki Senshu University), Kazushige Tanabe (University of Tokyo), Yukimitsu Tomida (National Science Museum), Kazuhiko Uemura (National Science Museum) Officers for 1991-1992 President: Kiyotaka Chinzei Honorary President: Teiichi Kobayashi Councillors: Kiyotaka Chinzei, Takashi Hamada, Y oshikazu Hasegawa, Itaru Hayami, Hiromichi Hirano, Hisayoshi Igo, Noriyuki Ikeya, Junji Itoigawa, Tomoki Kase, Makoto Kato, Tatsuaki Kimura, Itaru Koizumi, Kei Mori, Hiroshi Noda, Ikuo Obata, Kenshiro Ogasawara, Tomoo Ozawa, Tsunemasa Saito, Yokichi Takayanagi, Kazushige Tanabe Members of Standing Committee: Hiromichi Hirano (General Affairs), Tomoki Kase (Finance), Tsunemasa Saito (Editor in Chief, TPPSJ), Kei Mori (Co-Editor, TPPSJ), Noriyuki Ikeya (Planning), Hiroshi Noda (Membership; Co-Editor, Special Papers), Kazushige Tanabe (Foreign Affairs), Haru Hayami (Editor, "Fossils"), Juichi Yanagida (Co-Editor, Special Papers), Tatsuaki Kimura (Friends of Fossils) Secretaries: Akito Asai, Tatsuo Oji (General Affairs), Masanori Shimamoto (Editorial of l'PPSJ), Hiroshi Kitazato (Planning), Katsuo Sashida (Membership), Yukimitsu Tomida (Foreign Affairs), Katsumi Abe (Editorial of "Fossils"), Takeshi Ishibashi (Editorial of Special Papers), Tamiko Ohana (Friends of Fossils) Auditor: Kuniteru Matsumaru The fossil on the cover is Trilophodon sendaicus Matsumoto, an extinct elephant, which was described from the Pliocene Tatsunokuchi Formation developed in the vicinity of Sendai, Northeast Honshu, Japan. (IGPS colI. cat no. 87759 (A), length about 18.5 cm) All communication relating to this journal should be addressed to the PALAEONTOLOGICAL SOCIETY OF JAPAN c/o Business Center for Academic Societies, Honkemagome 5-16-9, Bunkyou-ku, Tokyo 113, Japan Trans. Proc. Palaeont. Soc. Japan, N.S., No. 165, pp. 1009-1023, 3 Figs., April 30, 1992 932. MOLLUSCAN FAUNA FROM THE LATE MIOCENE HATS USE FORMATION IN THE MIURA PENINSULA, KANAGAWA PREFECTURE, JAPAN* KIYOSHI OKUMURA Department of Natural Science, Naruto University of Education, Naruto City, Tokushima Prefecture, 772 and YUT AKA Y AMAGISHI Kurihama Junior High School, Yokosuka City, Kanagawa Prefecture, 238 Abstract. The Hatsuse Formation distributed in the southern part of the Miura Peninsula mainly consists of well-bedded marine tuff breccia, lappili tuff, and scoriaccous sandstone and siltstone of marine origin with intercalated thin layers of pumice and conglo­ meratic sandstone. The molluscan fossils occur from a rather coarse-grained sandstonc associatcd with fragments of pyroclastic rocks. The Hatsuse Fauna named herein is com­ posed of three species of Gastropoda, one species of Scaphopoda, and 15 species of Bivalvia. The Hatsuse Fauna is characteristically an admixture of euneritic and subneritic forms, though all of them are warm-water dwellers. In consideration of specics composition and their mode of occurrence, the shallow-water dwellers arc interpreted to bc the ones which were displaced into the outcr neritic environment. The geologic age of the Hatsuse Fauna indicates Late Miocene, and is correlated with the Zushi Fauna distributed in the northern part of the Miura Peninsula, Kanagawa Prefecture and the Senhata Fauna of the Boso Peninsula, Chiba Prefecturc. Key words. Hatsuse, Miura, Zushi, Senhata, Mollusca. Introduction ed in the southern part of the Miura Penin­ sula have been lithologically divided into the The Hatsuse Formation was originally Misaki, Aburatsubo and Hatsuse Formations described by Suzuki (1932) for the marine in ascending order, and those formations have strata distributed around Hatsuse-Machi in tentatively been correlated with Tertiary the northern part of Miura City, southern­ strata in the northern part of the Miura most part of the Miura Peninsula, Kanagawa Peninsula (Akamine el al., 1956; Mitsuna­ Prefecture. He also reported a large number shi and Yabe, 1968). The precise geological of molluscan fossils from this formation, age of these strata has remained undeter­ though these fossils were undoubtedly col­ mined. One important reason for this is that, lected from part of the Pleistocene Miyata hitherto, no fossils have been found from the Formation. Hatsuse Formation. Subsequentely, the Tertiary strata distribut- Recently, numerous fossil molluscs were 'Received Sepember I, 1991; accepted Decembcr 20, collected by the present authors from the 1991 Hatsuse Formation. This is probably the 1009 1010 Kiyoshi Okumura and Yutaka Yamagishi first fossil collection from this formation. Formation (Pleistocene) consists mainly of This fauna i ncl udes some characteristic loose sandstone. species as shown in Table 1. It can be con­ The Hatsuse Formation shows a strike tren­ sidered that those fossil moll.uscs carry very ding generally from N 60"W to EW with the important information for age determination exception of the N agahama and Arasaki areas and correlation of the Tertiary strata in this where it trends from N 30"E to N60"E. Also, area. marked folds and faults which trend in a The purpose of the present work is to northwest-to-southeast direction are devel­ discriminate the molluscan fossils from the oped in this formation. Hatsuse Formation, to attempt to determine There are three major synclines in Mito, the geological age, and to correlate these Nagahama and Kaneda and two anticlines in strata with molluscan faunas in the northern Kurosaki-no-Hana and Kami-Miyada. part of the Miura and Boso Peninsulas. Their axes cross the line of strike of the Hatsuse Formation (Figure I). The Acknowledgments Minami-Shitaura and Hikihashi faults are reverse faults thrusting up from southwest to The authors wish to express their apprecia­ northeast and can be observed in several tion to Dr. Saburo Kanno, former Professor places. The Hikihashi Fault, one of the of the University of Tsukuba for his kind thrust faults, is the boundary between the encouragement during the present study and Hatsuse and Aburatsubo Formations. critical reading of the manuscript. The maximum thickness of the Hatsuse Formation is estimated to be about 460 m by Brief note on the geology around Akamine et al. (1956). the fossil localities Fossil localities and fossil occurrences The Miocene strata, in which the present fossil localities are incl uded, are overlain Molluscan fossils were collected from two unconformably by the Pleistocene Miyata localities near the Wakamiya Shrine, Kanda, Formation. According to Akamine et al. Hatsuse-machi, Miura City. One (Loc. A) is (1956), the Miocene strata distributed in the a small exposure on the east side of the Public southern part of the Miura Peninsula can be Hall of Kanda region, Miura City and other divided into three stratigraphic units: Misa­ one (Loc. B) is a small cutting exposed on the ki, Aburatsubo and Hatsuse Formations in mountain foot about 250 m south of the ascending order. These formations are main­ shrine, and about 450 m northeast of Loc. A ly characterized by pyroclastic rocks. (Figure I). Both fossil localities can be The Misaki Formation is overlain confor­ regarded as of equivalent stratigraphic posi­ mably by the Aburatsubo Formation, which tion. is overlain partially by the Hatsuse Forma­ Loc. A: Molluscan fossils occurred from a tion. The Hatsuse Formation consists main­ massive, conglomeratic tuffaceous sandstone. ly of brownish or yellowish andesitic tuff Most of the molluscs are sporadically scat­ breccia and lapilli tuff which are partially tered, and are mostly inner or outer molds, interbedded with scoriaceous sandstone, pyro­ except for the following species; Glycymeris clastic siltstone and thin layers of pumic and rotunda (Dunker), Chlamys miurensis (Yo­ conglomeratic sandstone. Cross-laminations koyama), Miyagipecten matsumoriensis are well developed in this formation and serve Masuda, and Amussiopecten akiyamae to distinguish it from the underlying Abura­ Masuda. tsubo Formation. The overlying Miyata The dominant species at Loc. A include 932. Molluscan Fauna from the Hatsuse Formation 1011 Glycymeris rotunda, Chlamys miurensis, rocky or gravelly bottoms at depths ranging Amllssiopecten akiyamae, Miyagipecten ma­ from about 50 to 200 m (Habe and Kosuge, tSlimoriensis, Laevicardium sp., and Clinocar­ 1967), whereas the latter inhabits rocky or dillm sp. shelly bottom from littoral depths to 180 m Loc. B: Molluscan fossils occured from a (Keen, 1963). Another rather deep-water pyroclastic, conglomeratic sandstone. F os­ dweller is Fissidentalium found at Loc. Band sils are sporadically scattered as in Loc. A, this species presently lives from about 50 to but are more dense in this locality than in 200 m depth (Habe and Kosuge, 1967). Loc. A. The dominant species from this In terms of faunal similarities between the locality are as follows; Glycymeris rotunda, A and B localities, only a few species are In docrassatella cf. tenuilirata (Shuto), common to both, namely Glycymeris rotunda, Laevicardium a ngustum (Y 0 koyama), Chlamys miurensis, Amussiopecten akiyamae
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