Fossil fish otoliths from the Chibanian Miyata Formation,Kanagawa Prefecture,Japan, with comments on the paleoenvironment |
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| Affiliation: | 1. Graduate School of Marine Science and Technology, Tokyo University of Marine Science and Technology, 4-5-7 Konan, Minato-ku, Tokyo 108-8477, Japan;2. Kanagawa Prefectural Museum of Natural History, 499 Iryuda, Odawara City, Kanagawa 250-0031 Japan;3. Nara National Research Institute for Cultural Properties, 2-9-1 Nijo, Nara City, Nara 630-8577 Japan;4. Biodiversity Research Center, Academia Sinica, Greenhouse Building 246, 128 Academia Road, Sec. 2, Nankang, Taipei 11529, Taiwan;1. Analytical Center for Environmental Study, Atmosphere and Ocean Research Institute, The University of Tokyo, 5-1-5 Kashiwanoha, Kashiwa, Chiba 277-8564, Japan;2. Department of Earth and Planetary Science, Graduate School of Science, The University of Tokyo, 7-3-1 Hongo, Tokyo 113-0033, Japan;3. Department of Biogeoscience, Japan Agency for Marine-Earth Science and Technology, 2-15 Natsushima-cho, Yokosuka, Kanagawa 237-0061, Japan;4. Department of Archaeology and Ancient History, The M. S. University of Baroda, Vadodara, 390 002, India;5. Department of Geography, Hosei University, 2-17-1 Fujimi, Tokyo 102-8160, Japan;6. Research Institute for Humanity and Nature (Emeritus), 457-4 Motoyama, Kamigamo, Kita-ku, Kyoto 603-8047, Japan;1. Departamento de Química y Biología, Facultad de Ciencias Naturales, Universidad de Atacama, Av. Copayapu 485, Copiapó, Chile;2. SNSB-Bayerische Staatssammlung für Paläontologie und Geologie, Richard-Wagner-Straße 10, 80333 Munich, Germany;3. Department für Geo- und Umweltwissenschaften, Paläontologie und Geobiologie, Ludwig-Maximilians-Universität, Richard-Wagner-Straße 10, 80333 Munich, Germany;4. Department of Ecology and Evolutionary Biology, and Biodiversity Institute, University of Kansas, Lawrence, KS 66045-7534, USA;5. Urweltmuseum GEOSKOP, Burg Lichtenberg (Pfalz) Burgstrasse 19, 66871 Thallichtenberg, Germany;6. Forschungsstelle für Paläobotanik, Institut für Geologie und Paläontologie, Westfälische Wilhelms-Universität Münster, Heisenbergstraße 2, 48149 Münster, Germany;1. N.P. Yushkin Institute of Geology of the FRC Komi Science Center of the Ural Branch of the Russian Academy of Sciences, Syktyvkar 167982, Komi Republic, Russia;2. Department of Geological Sciences, Masaryk University, Kotlářská 2, 611 37 Brno, Czech Republic |
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| Abstract: | The Paleo-Tokyo Bay (Kanto Plateau) that persisted during the transgression periods in the Middle-Late Pleistocene is known for its rich marine fauna that accommodated both the warm and cold water taxa brought by the Kuroshio and Oyashio Currents, respectively. However, little is known on the paleoichthyofauna in this area and the processes shaping the marine ichthyofauna of modern southern Kanto. We used fossil fish otoliths and teeth discovered in the Sha’ana Tuffaceous Sand Member belonging to the Chibanian Miyata Formation, exposed at Sha’ana-dai, Miura City, Kanagawa Prefecture, Japan, to reconstruct the paleoichthyofauna and its associated paleoenvironment and explore the content of fish assemblages during this period. The Sha’ana Tuffaceous Sand Member was composed of upper sandy mud and lower muddy sand horizons at the exposure. A total of 1,675 fish remains were collected from this site, of which 1,389 were assigned to 62 distinct taxa (20 orders, 31 families). The taxonomic composition revealed taxa from various environments, including shallow continental shelf, epi- to meso-pelagic settings, and the majority were from a generally temperate climatic zone. Paleoenvironmental analyses suggested that the fish assemblages were from the continental shelf (approximate depth of 100–200 m) in a temperate sea where both warm Kuroshio and cold Oyashio Currents had an influence on the biota. The analysis also showed that two boreal fishes, namely Clupea pallasii and Theragra chalcogramma, once had a wider distribution that extended to the southwestern areas of the Paleo-Tokyo Bay. This study provides a more complete view of the related paleobiogeography of marine fishes during the Chibanian and is essential for reconstructing the evolutionary processes of the rich ichthyofauna in the southern Kanto. |
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| Keywords: | Pleistocene Paleoichthyofauna Paleobiogeography Fish otoliths Chondrichthyan teeth |
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