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1 January 2020 Early Cenomanian (Late Cretaceous) Ammonoids from the Miyanohara Formation in the Sakawa Area, Shikoku, Southwestern Japan
Akihiro Misaki, Yoshihiko Okazaki, Yoshiaki Mizuno, Takeshi Matsunaga
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Abstract

Mid-Cretaceous ammonoids, Euhystrichoceras nicaisei, Mantelliceras japonicum, and Hypostlingoceras japonicum were collected from float rocks probably derived from the middle part of the Miyanohara Formation in the Sakawa area, Shikoku, southwestern Japan. Although it has been suggested that the stratigraphic correlation of this formation based mainly on bivalves such as trigoniids needs to be reexamined, the occurrence of these ammonoids confirms that the middle part of the Miyanohara Formation is correlated to the lower Cenomanian. The results of this study support the suggestion that the shallow marine deposits of the mid-Cretaceous that contain similar molluscan faunas are widely distributed throughout the northwestern Pacific region.

© by the Palaeontological Society of Japan
Akihiro Misaki, Yoshihiko Okazaki, Yoshiaki Mizuno, and Takeshi Matsunaga "Early Cenomanian (Late Cretaceous) Ammonoids from the Miyanohara Formation in the Sakawa Area, Shikoku, Southwestern Japan," Paleontological Research 24(1), 72-81, (1 January 2020). https://doi.org/10.2517/2019PR008
Received: 2 February 2019; Accepted: 3 April 2019; Published: 1 January 2020
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KEYWORDS
ammonoid
Cenomanian
Cretaceous
Miyanohara Formation
Sakawa
Sotoizumi Group
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