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＜departmental bulletin paper＞
Notes on Pachydiscus from Hokkaido : Studies on the Cretaceous Ammonites from Hokkaido and Saghalien-XXXIX
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| Abstract | In this paper four new species are established for the genus Pachydiscus based on the specimens from Hokkaido. The first one, which certainly belongs to the subgroup of P. neubergicus-P. gollevillensi...s, occurs in K6a (Campanian). Other three are from K6b (approximately Maastrichtian). The second new species, characterized by flexuous ribs, is diagnostic of K6b2. Some specimens which were referred to P. (P.) subcompressus should be transferred to this second new species. The third new species of P. (P.) was found solitarily from K6b of the Urakawa area. The fourth new species from K6b2 is referred to P. (Neodesmoceras) and is distinct from P. (N.) japonicus from K6b1. In conclusion, these Pachydiscus species from Hokkaido are discussed in connexion with the problem of faunal provincialism and a difficulty in precise inter-regional correlation is explained.show more |
| Table of Contents | Palaeontological Descriptions Part Ⅰ: Some New species of Pachydiscus from the Tombetsu [Tatsuro Matsumoto] Part Ⅱ: A New Species of Pachydiscus from the Urakawa Area [Tatsuro Matsumoto/Yasumitsu Kanie] Part Ⅲ: Two Species of Pachydiscus from the Nemero-Hmanaka Area [Tatsuro Matsumoto/Saburo Yoshida] |
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| Created Date | 2015.11.13 |
| Modified Date | 2021.02.18 |