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Campanian (Late Cretaceous) Ammonoids and Inoceramids from the Ribira River Area, Hokkaido, Northern Japan

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Campanian (Late Cretaceous) Ammonoids and Inoceramids from the Ribira River Area, Hokkaido, Northern Japan ISSN 1881-9109 National Museum of Nature and Science Monographs No. 50 CAMPANIAN (LATE CRETACEOUS) AMMONOIDS AND INOCERAMIDS FROM THE RIBIRA RIVER AREA, HOKKAIDO, NORTHERN JAPAN Yasunari Shigeta Masataka Izukura Tomohiro Nishimura National Museum of Nature and Science Tokyo, February 2019 National Museum of Nature and Science Monographs No. 50 ISSN 1881-9109 National Museum of Nature and Science Monographs No. 50 Campanian (Late Cretaceous) ammonoids and inoceramids from the Ribira River area, Hokkaido, northern Japan Yasunari Shigeta Masataka Izukura Tomohiro Nishimura National Museum of Nature and Science Tokyo, February 2019 Editorial Board Fumitaka Wakabayashi, Editor-in-Chief, Department of Science and Engineering Toshio Kubota, Managing Editor, Department of Science and Engineering Ritsuro Miyawaki, Principal Editor, Department of Geology and Paleontology Megumi Saito-Kato, Principal Editor, Department of Geology and Paleontology Toshiaki Kuramochi, Department of Zoology Shoji Hamao, Department of Zoology Masanobu Higuchi, Department of Botany Yoshihito Ohmura, Department of Botany Ken-ichi Shinoda, Department of Anthropology Kazuhiro Sakaue, Department of Anthropology Yasunori Sato, Institute for Nature Study Makoto Manabe, Collection Center National Museum of Nature and Science Ueno Park, Tokyo, 110–8718 Japan Copyright ©2019 National Museum of Nature and Science, Tokyo Published on 1 February, 2019 Printed by International Academic Publishing Co., Ltd., Tokyo ISSN 1881-9109 ISBN 978-4-87803-044-4 Cover picture: Heteromorph ammonoid Didymoceras hidakense from a float concretion that most likely weathered out of the lower upper Campanian Baculites subanceps beds in the Ribira River area, Hokkaido. The specimen’s discovery by Noboru Sasaki alerted us to the presence of upper Campanian strata in the vicinity and provided the opportunity to conduct an intensive investigation of the area’s Cretaceous stratigraphy and paleontology. i CONTENTS Abstract ...........................................................................................................................................1 Introduction ....................................................................................................................................1 Notes on stratigraphy ....................................................................................................................2 Urakawa Formation .................................................................................................................4 Chinomigawa Formation .........................................................................................................5 Biostratigraphic subdivision .......................................................................................................10 Gaudryceras tenuiliratum beds ..............................................................................................10 Sphenoceramus orientalis beds ..............................................................................................10 Sphenoceramus schmidti beds ...............................................................................................10 Metaplacenticeras subtilistriatum beds .................................................................................10 Baculites pacificus beds .........................................................................................................11 Baculites subanceps beds .......................................................................................................12 Baculites rex beds ..................................................................................................................12 Discussion Biostratigraphic implication ...................................................................................................12 Paleobiogeography of Pachydiscus .......................................................................................13 Paleontological description (by Y. Shigeta) .................................................................................14 Suborder Phylloceratina Arkell, 1950 ........................................................................................14 Neophylloceras nodosum Shigeta sp. nov. ............................................................................14 Neophylloceras ramosum (Meek, 1858) ................................................................................16 Phyllopachyceras ezoense (Yokoyama, 1890) .......................................................................17 Suborder Lytoceratina Hyatt, 1889 ............................................................................................17 Saghalinites teshioensis Matsumoto, 1984 ............................................................................17 Tetragonites glabrus (Jimbo, 1894) .......................................................................................20 Tetragonites popetensis Yabe, 1903 .......................................................................................20 ii Gaudryceras tenuiliratum Yabe, 1903 ...................................................................................27 Gaudryceras intermedium Yabe, 1903 ..................................................................................32 Gaudryceras striatum (Jimbo, 1894) .....................................................................................34 Gaudryceras mamiyai Matsumoto and Miyauchi, 1984 ........................................................36 Gaudryceras sp. 1 ..................................................................................................................36 Gaudryceras sp. 2 ..................................................................................................................39 Suborder Ammonitina Hyatt, 1889 ............................................................................................39 Damesites sp. .........................................................................................................................39 Desmophyllites diphylloides (Forbes, 1846) ..........................................................................39 Eupachydiscus haradai (Jimbo, 1894) ..................................................................................43 Canadoceras mysticum Matsumoto, 1954 .............................................................................45 Canadoceras multicostatum Matsumoto, 1954 .....................................................................48 Canadoceras sp. ....................................................................................................................48 Menuites sanadai Matsumoto, 1984 ......................................................................................50 Menuites armatus Shigeta sp. nov. ........................................................................................53 Menuites fascicostatus (Yabe in Yabe and Shimizu, 1921) ...................................................59 Menuites nelchinensis (Jones, 1963) ......................................................................................59 Menuites sp. ...........................................................................................................................65 Patagiosites sp. ......................................................................................................................66 Pachydiscus excelsus Matsumoto, 1979 ................................................................................67 Metaplacenticeras subtilistriatum (Jimbo, 1894) ..................................................................75 Suborder Ancyloceratina Wiedmann, 1966 ...............................................................................75 Ainoceras kamuy Matsumoto and Kanie, 1967 .....................................................................75 Didymoceras hidakense Shigeta in Shigeta et al., 2016 ........................................................78 Didymoceras? sp. ..................................................................................................................99 Parasolenoceras ribiraense Shigeta sp. nov. .........................................................................99 Parasolenoceras sp. ............................................................................................................101 Diplomoceras sp. .................................................................................................................101 Baculites yezoensis Matsumoto and Miyauchi, 1984 ..........................................................101 Baculites pacificus Matsumoto and Obata, 1984 .................................................................105 Baculites subanceps Haughton, 1925 ..................................................................................121 iii Baculites rex Anderson, 1958 ..............................................................................................121 Baculites sp. ........................................................................................................................130 Conclusions .................................................................................................................................130 Acknowledgments ......................................................................................................................130 References ...................................................................................................................................130
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