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Paleontological Research
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Abstract
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.
We wish to thank Hiroyoshi Sano, Haruyoshi Maeda, and Manabu Kano for their help in accessing museum collections and references; Toshifumi Komatsu and Matthew H. Dick for identification of bryozoans; Tomihiro Mizobuchi for fruitful discussions; and Tomohiro Nishimura, Yasuyuki Tsujino and Yasunari Shigeta for their valuable comments on the first draft. This study was supported in part by the Sasakawa Scientific Research Grant of the Japan Science Society and JSPS KAKENHI Grant Number JP25800290 and JP17H02028.
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