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This paper is concerned primarily with the description of the fusulinaceans and the zonation of the type Sakamotozawa Formation of the Kitakami massif, which is the type sequence of a comprehensive bi...ostratigraphic unit, the Sakamotozawa Series, of the Lower Permian of Japan. In the description of species one new species is established and other already known species are revised or commented. The Sakamotozawa Formation contains varied fusuline faunas that permit its division into five zones, each of which is defined by a particular assemblage of species. They are the Zellia nunosei and the Monodiexodina langsonensis-Nipponitella explicata zone in the Lower Subformation, and the Pseudofusulina vulgaris (s.l.), the P. fusiformis and the P. ambigua zone in the Upper. Further subdivision is also possible on relatively short-ranged species. There is a remarkable faunal change at the unconformable .boundary between the two subformations. The lower two zones are accompanied with species of Paraschwagerina (s.s.), P. (Acervoschwagerina), Rugosofusulina and quasifusulina, while the upper three zones are characterized by predominant occurrence of species of Pseudofusulina and are associated with species of Schwagerina and Nagatoella. Species of Paraschwagerina (s.s.), P. (Acervoschwagerina) do not abundantly occur, but they are confined to the Lower Subformation. A species of Zellia has a short stratigraphic range and defines the lowest zone in the formation. A species of Pseudoschwagerina (Robustoschwagerina) ranges up into the Upper Subformation. In conclusion some remarks are given to the zonal correlation of the Lower Permian between the selected areas in Japan and other provinces.続きを見る
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1.Introduction 2.Description of species 3.Zonation of the type Sakamotozawa Series 4.Correlation 5.References
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Mendeley出力
16_03_p275