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Jurassic Forum » JURASSIC references & paper reviews » Jurassic around the world » Nakada T. (2014) (Ammonoid biostratigraphy of the Nishinakayama Formation)
Nakada T. (2014)
mhornДата: Wednesday, 29.10.2014, 15:28 | Сообщение # 1
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Nakada T. (2014) Ammonoid biostratigraphy of the Nishinakayama Formation in the Toyora Group exposed in the Nishinakayama area, Kikugawa Town, Shimonoseki City // Bull. Firefly Museum of Toyota town. Vol. 6. P.9-17.

http://www.hotaru-museum.jp/pamphlet/images/bul2013/nakada(2014).pdf

The Nishinakayama Formation, the middle part of the Lower Jurassic Toyora Group, has been known as one of the most major sources of the Early Jurassic Mollusca fossils, especially ammonoids. The ammonoid biostratigraphy with the detailed international correlation was recently reestablished along the Sakuraguchidani Valley, the northern North district of the Toyora Group. The aim of this study is to discuss the ammonoid biostratigraphy in the Nishinakayama area, located in the southern North district, on the basis of the revised zonation. Three ammonoid assemblages are recognized in the study area. The lower assemblage (KNO0301 assemblage) seems to be corresponded to the Canavaria japonica Zone (the uppermost Pliensbachian), and the upper assemblage (KNO0102 assemblage) is compared to the Harpoceras inouyei Zone (the middle Lower Toarcian). The ammonoid faunal associations and their stratigraphic transition have been also recognized in the Sakuraguchidani Valley. These evidences suggest that the revised ammonoid zonal framework in the Sakuraguchidani Valley enables to be applied to the southern North district of the Toyora Group. The revised zonation with the high versatility in the North district will contribute to the international correlation of the Early Toarcian (Early Jurassic) Oceanic Anoxic Event analyzed in the Toyora Group


Middle Jurassic - Lower Cretaceous ammonites & aptychi
 
Jurassic Forum » JURASSIC references & paper reviews » Jurassic around the world » Nakada T. (2014) (Ammonoid biostratigraphy of the Nishinakayama Formation)
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