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＜departmental bulletin paper＞
Ainoceras, A New Heteromorph Ammonoid Genus from the Upper Cretaceous of Hokkaido : Studies of the Cretaceous Ammonites from Hokkaido and Saghalien－XVI
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| Abstract | A new heteromorph ammonoid genus is established in this paper under the family Nostoceratidae. It has helical septate whorls and a crioceratoid body-chamber. It is ornamented with distant ribs which a...re Hared in later growth-stages. Two new species are described under this new genus. They occur in the zone of Inoceramus orientalis, substage K5γ, approximately Lower Campanian, of Hokkaido.show more |
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| Created Date | 2015.10.28 |
| Modified Date | 2021.02.18 |