An Early Albian Arctic-type ammonite Arcthoplites from Hokkaido,northern Japan,and its paleobiogeographic and paleoclimatological implications |
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| Authors: | Yasuhiro Iba |
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| Institution: | 1. Department of Earth Sciences, Indian Institute of Technology Bombay, Powai, Mumbai 4000765, India;2. Solid State Physics Division, Bhabha Atomic Research Centre, Mumbai 400085, India;1. Leibniz Universität Hannover, Institut für Geologie, Callinstraße 30, D-30167 Hannover, Germany;2. Ruhr-Universität Bochum, Institut für Geologie, Mineralogie und Geophysik, D-44870 Bochum, Germany;3. ETH Zürich, Geological Institute, CH-8004 Zürich, Switzerland;1. Institute of Nature Conservation Polish Academy of Sciences, Adama Mickiewicza 33 Ave, 31-120, Kraków, Poland;2. Polish Geological Institute - National Research Institute, Carpathian Branch, Skrzatów 1 Str., 31-560, Kraków, Poland;3. AGH University of Science and Technology, al. A. Mickiewicza 30, 30-059 Kraków, Poland;4. Mass Spectrometry Laboratory, Institute of Physics, UMCS, M. Curie-Sk?odowskiej 1 Sq.; 20-031, Lublin, Poland;1. Research Center for Science and Technology, Duy Tan University, K7/25 Quang Trung, Danang, Viet Nam;2. Department of Earth and Environmental Sciences, KU Leuven, Celestijnenlaan 200E, 3001 Leuven, Belgium |
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| Abstract: | An Early Albian Arctic-type ammonite Arcthoplites was discovered from the Kamiji Formation of the Yezo Group in the Nakagawa area, northern Hokkaido, northern Japan. This is the first reliable record of a hoplitid ammonite from Japan and clearly indicates the distribution of an Arctic fauna in the middle latitudes of the North Pacific at that time. Synchronously with the appearance of this Arctic-type ammonite, the tropical Tethyan biota (Mesogean taxa) disappeared from Hokkaido and elsewhere in the Northwest Pacific. These biogeographic changes suggest the existence of a “cooling” episode in the Early Albian North Pacific. |
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