Title 福 井 県 の 九 頭 竜 川 上 流 地 域 東 部 の 手 取 層 群 の 層 序 と 白 山 周 辺 地 域 の 手 取 層 群 との 比 較 Author(s) 松 川, 正 樹 ; 西 田, 尚 央 ; 小 荒 井, 千 人 ; 林, 慶 一 ; 青 野, 伊 藤, 慎 Citation 東 京 学 芸 大 学 紀 要. 第 4 部 門, 数 学 自 然 科 学, 55: 191-20 Issue Date 2003-08-01 URL http://hdl.handle.net/2309/1635 Publisher 東 京 学 芸 大 学 紀 要 出 版 委 員 会 Rights
4 pp 191 200 2003 2003 3 20 MATSUKAWA, M., NISHDA, N., KOARAI, K., HAYASHI, K., AONO, H. and ITO, M. : Stratigraphy of the Tetori Group in the eastern part of the Kuzuryugawa area, Fukui Prefecture, Japan and correlation with its main part in the vicinity of Mount Hakusan, central Japan. Bull. Tokyo Gakugei Univ. Sect., 55 : 191 200 2003 ISSN 0371 6813 As the Jurassic to Cretaceous Tetori Group includes thin shallow marine deposits in thick terrestrial sequences, it is suitable for understanding environmental and biological changes and basin developments in the marginal area of Asian continent. A coherent stratigraphy of the group throughout the whole area is needed for an understanding of the problem. Hitherto, regional formation names of the group were separately given for sequences in some areas of the greater Mount Hakusan region that is a main area of exposure for the group. Coherent stratigraphy of the group is revealed through our new geological correlation between the areas. The group in the Kuzuryugawa area is divided into five formations; the Tochimochiyama, Kaizara, Yambara, Izuki and Nochino formations in ascending order. These formations are correlative with seven formations in a main area; the Tochimochiyama is correlative with the Ushimaru, the Kaizara with the Mitarai, the Yambara with the Otaniyama, the Izuki with the Okurodani and the Nochino with the Amagodani, the Okura and the Bessandani. From the occurrence of three molluscan assemblages, the transgression-phase is recognizable in the type section of the Izuki Formation. This concurs with the sequence of occurrences of nonmarine bivalves of Myrene (Mesocorbicula) tetoriensis and marine inoceramid and pectinids bivalves in the Izuki Formation in its eastern outcrops. The Tetori Flora was previously divided into two components: the Oguchi Flora and the Akaiwa Flora. Our stratigraphic studies show that these occurrences are the same horizon. Thus the Tetori Flora is a single assemblage only distinguished by two separate localities of occurrence. The terms Oguchi Flora and Akaiwa Flora can therefore be abandoned for the term the Tetori Flora. (in Japanese) Tetori Group, Jurassic, Cretaceous, Kuzuryugawa area, stratigraphic correlation, evaluation of phytobiostratigraphy, transgression Department of Science Education, Tokyo Gakugei University, Koganei-Shi, Tokyo 184-8501, Japan. 184-8501 4 1 1 Keio Shonan Fujisawa Junior and Senior High School, Fujisawa 252 0816, Japan Laboratory of Earth Sciences, Konan University, Kobe 658 8501, Japan Attached High School, Tokyo Seitoku University, Tokyo 114, Japan Department of Earth Sciences, Chiba University, Chiba 263 0022, Japan 191
4 55 2003 corbiculoids corbiculoids corbiculoids 2003a, 1961 2003a Table 1 1933 1950, 1951 1952, 1961 1957 1989 1952 Area Hakusan Kuzuryugawa Matsukawa et al. 2003a This study Maeda 1952 1961 Kawai et al. 1957 Yamada et al. 1989 Akaiwa Subgp. Bessandani Fm. Okura Fm. Amagodani Fm. Nochino Fm. Kitadani alternation Akaiwa sandstone Nochino conglomerate mbr. Stratigraphic division Itoshiro Subgp. Kuzuryu Subgp. Okurodani Fm. (Kuwajima Fm.) Otaniyama Fm. Mitarai Fm. Ushimaru Fm. Izuki Fm. Yambara Fm. Kaizara Fm. Tochimochiyama Fm. Izuki shale Obuchi conglomerate Ashidani alternation Yambara conglomerate Yambarazaka alternation Kaizara shale Tochimochiyama sandstone Oidani alternation Shimoyama conglomerate Shimoanama Fm. Arashimadani Fm. Izuki shale mbr. Kakunomaesaka alternation mbr. Dosaiyama conglomerate mbr. Yambarazaka alternation mbr. Kaizara shale mbr. Kamiwakogo conglomerate mbr. Shimowakogo alternation mbr. Shimoyama conglomerate mbr. Itoshiro Subgp. Kuzuryu Subgp. upper mbr. lower mbr. upper mbr. middle mbr. lower mbr. lower most mbr. 192
Figures 1, 2 Figure 3 1998 Inoceramus sp. cf. I. maedae Hayami Tochimochiyama Formation 1952 1952 1957 1989 600c Kaizara Formation 1952 1952 1957 1989 193
4 55 2003 194
480c c 1961 Sato 1962 1990 Figures 2, 3;, Neuqueniceras yokoyamai Kobayashi & Fukada Sato, 1962 Sato and Westerman, 1985 Izuki Formation 1933 1952 1957 1989 1040c Yambara Formation 1933 1952 1957 1989 1300c Figure 1, 2, 3, 5 Matsukawa and Ido 1993 Ostreidae gen. et sp. indet. Unio? ogamigoensis Myrene (Mesocorbicula) tetoriensis Tetoria (T.) yokoyamai Sphaerium sp. Batissa antiqua Figures 2, 3; Figures 2, 3; Myrene (Mesocorbicula) tetoriensis Figures 2, 3; pectinid gen. et sp. indet. 1998Inoceramus sp. cf. I. maedae 195
4 55 2003 Figures 2, 3; Myrene (Mesocorbicula) tetoriensis Figures 2, 3; 1978 Nochino Formation 1933 1952 1957 950c Figures 2, 3;, 2003, 2003a Figure 4 1961 Neuqueniceras yokoyamai Kepplerites japonicus Oxycerites cf. sulaensis Kranaosphinctes matsushimai Sato, 1962 Sato and Westerman, 1985 Kr Ar, 2003a 196
2003a, 2003a; b 2003b 1978 2003a 1978 Figures 2, 3; 1978 1978, 2003b Matsukawa et al., 1997 1998 Takahashi and Matsukawa, 2000, 1999 197
4 55 2003, 2003a, b 1998 Inoceramus sp. cf. I. maedae Hayami 1989 1994 Cylindroteuthididae, 2001 1 2 Figures 2, 3, 5 1998 Myrene (Mesocorbicula) tetoriensis (Kobayashi et Suzuki) Inoceramus sp. cf. I. maedae Hayami Figures 2, 3; 2 1 1 2 1998 Myrene (Mesocorbicula) tetoriensis (Kobayashi et Suzuki) Inoceramus sp. cf. I. maedae Hayami 1957 ( ) 198
[1] Ostreidae gen. et sp. indet. - Myrene (Mesocorbicula) tetoriensis [2] Myrene (M.) tetoriensis [3] Tetoria (Tetoria) yokoyamai [4] Sphaerium sp. [5] Plicatounio (Plicatounio) naktongensis - Trigonioides (Wakinoa) tetoriensis Matsukawa and Ido, 1993 Myrene (Mesocorbicula) tetoriensis (Kobayashi et Suzuki) [1] [2] [3] oligohaline mesohaline, 1999 [1] [2] [3] Ostreidae gen. et sp. indet. mesohaline brachyhaline Tetoria (Tetoria) yokoyamai fresh water mesohaline Myrene (Mesocorbicula) tetoriensis Ostreidae gen. et sp. indet. Tetoria (T.) yokoyamai, 1999 Inoceramid pectinid Myrene (Mesocorbicula) tetoriensis (Kobayashi et Suzuki) Inoceramus sp. cf. I. maedae Hayami Pectinidae gen. et sp. indet., 1995 Sphaerium sp. Figure 5 IZ 002 Tetoria (T.) yokoyamai Figure 5 IZ 004 Myrene (M.) tetoriensis Figure 5 IZ 006, 005, 003, 009, 010, Ostreidae gen. et sp. indet. - Myrene (M.) tetoriensis Figure 5 IZ 010 Myrene (M.) tetoriensis Figure 5 IZ 013 Ostreidae gen. et sp. indet. - Myrene (M.) tetoriensis 1 2, 1978 1978 1978 2003b 3 1998 Myrene (Mesocorbicula) tetoriensis (Kobayashi et Suzuki) Inoceramus sp. cf. I. maedae Hayami 1183303 1999 2000 11791012 1999 2001 199
4 55 2003 1998 52 55 1990 74pp 1957 5 110pp 1978 119 271 2003 152 50 1994 101 95 2001 321 328 1950 286 1951 276 1952 401 410 1957 225 237 1961 369 426 Matsukawa, M. and Ido, K., 1993, Nonmarine mollusucan communities and palaeoecology in the Jurassic-Cretaceous Tetori Group, Japan. Cret. Res.,, 365 381. Matsukawa, M, Ito, M., Hayashi, K., Takahashi, O., Yang, Y.S.and Lim, S.K., 1998, Evaluation of nonmarine bivalves as index fossils based on those from the Lower Cretaceous in East Asia, New Mexico Museum of Natural History and Science Bulletin,, 125 133. 1995 42 53 2003a 2003b 1999 817 835 Matsukawa, M., Takahashi, O., Hayashi, K., Ito, M. and V. P. Konovalov, 1997, Early Cretaceous Paleogeography of Japan based on tectonic and faunal date. Mem. Geo. Soc. Japan, no. 48, 29 42. 1933 614 644 669 699 Sato, T., 1962, Études biostratigraphiques des ammonites du Jurassique du Japon. Mém. Soc. Géol. France, N.S., 94, 1 122. Sato, T. and Westerman, G.E.G., 1985, Range chart and zonations in Japan. IGCP # 171 Circum-Pacific Jurassic, Field conference 3, Tsukuba, 73 91. Takahashi, O. and Matsukawa, M., 2000, Oceanward shifting of the Hauterivian (Early Cretaceous) arc-trench system in East Asia. Geosciences Journal, 187 199. 1989 391 403 200