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翻訳と辞書　辞書検索 [ 開発暫定版 ] スポンサード リンク Serravallian ： ウィキペディア英語版 Serravallian The Serravallian is in the geologic timescale an age or a stage in the middle Miocene epoch/series, that spans the time between 13.65 ± 0.05 Ma and 11.608 ± 0.005 Ma (million years ago). The Serravallian follows the Langhian and is followed by the Tortonian.〔Gradstein ''et al.'' (2004)〕 It overlaps with the middle of the Astaracian European Land Mammal Mega Zone, the upper Barstovian and lower Clarendonian North American Land Mammal Ages and the Laventan and lower Mayoan South American Land Mammal Ages. It is also coeval with the Sarmatian and upper Badenian stages of the Paratethys time scale of Central and eastern Europe. ==Definition== The Serravallian stage was introduced in stratigraphy by the Italian geologist Lorenzo Pareto in 1865.〔(Lorenzo Pareto, Note sur les subdivisions que l'on pourrait établir dans les terrains tertaires de l'Apennin septentrional In ''Bulletin de la Société Géologique de France'', volume 22, série 2, pp. 210-277 )〕 It was named after the town of Serravalle Scrivia in northern Italy. The base of the Serravallian is at the first occurrence of fossils of the nannoplankton species ''Sphenolithus heteromorphus'' and is located in the magnetic chronozone C5ABr. The official GSSP for the Serravallian is in the Ras el Pellegrin section, close to the castle at Fomm ir-Riħ, southern Malta. The top of the Serravallian (the base of the Tortonian stage) is at the last common appearance of calcareous nannoplanktons ''Discoaster kugleri'' and planktonic foram ''Globigerinoides subquadratus''. It is also associated with the short normal polarized magnetic chronozone C5r.2n. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Serravallian」の詳細全文を読む スポンサード リンク 翻訳と辞書 : 翻訳のためのインターネットリソース Copyright(C) kotoba.ne.jp 1997-2016. All Rights Reserved.