The Last Surviving Ammonoid at the end of the Cretaceous in the North Pacific Region

Ken'ichi Kurihara; Manabu Kano; Hiroshi Sawamura; Yoshio Sato

doi:10.2517/2015PR027

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Ken'ichi Kurihara,¹ Manabu Kano,² Hiroshi Sawamura,³ Yoshio Sato⁴

¹Hokkaido Museum, 53-2 Konopporo, Atsubetsu-cho, Atsubetsu-ku, Sapporo, Hokkaido 004-0006, Japan(e-mail: ) kurihara.kenichi@pref.hokkaido.lg.jp
²Mikasa City Museum, 1-212-1 Nishiki-cho, Ikushumbetsu, Mikasa, Hokkaido 068-2111, Japan
³Ashoro Museum of Paleontology, 1-29-25 Konan, Ashoro Town, Hokkaido 089-3727, Japan
⁴Historical Museum of Urahoro, 16-1 Sakura-machi, Urahoro Town, Hokkaido 089-5614, Japan

Abstract

This paper describes the first record of the heteromorph ammonoid Diplomoceras cylindraceum from the uppermost Maastrichtian Kawaruppu Formation of the Nemuro Group, southeastern Hokkaido, Japan. D. cylindraceum was found in a siltstone 15 m below the Cretaceous/Paleogene (K/Pg) boundary. The stratigraphical level of the fossil is estimated to be ∼66.8 Ma, based on the time scale for the geomagnetical polarity and the K/Pg boundary. D. cylindraceum, therefore, was living at least ∼0.8 m.y. before the K/Pg boundary event in the north Pacific region.

Citation Download Citation

Ken'ichi Kurihara, Manabu Kano, Hiroshi Sawamura, and Yoshio Sato "The Last Surviving Ammonoid at the end of the Cretaceous in the North Pacific Region," Paleontological Research 20(2), 116-120, (1 April 2016). https://doi.org/10.2517/2015PR027

Received: 7 August 2015; Accepted: 1 September 2015; Published: 1 April 2016

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