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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 Oxfordian (stage) ： ウィキペディア英語版 Oxfordian (stage) The Oxfordian is, in the ICS' geologic timescale, the earliest age of the Late Jurassic epoch, or the lowest stage of the Upper Jurassic series. It spans the time between 163.5 ± 4 Ma and 157.3 ± 4 Ma (million years ago). The Oxfordian is preceded by the Callovian and is followed by the Kimmeridgian.〔For a detailed geologic timescale see Gradstein ''et al''. (2004)〕 ==Stratigraphic definitions== The Oxfordian stage was introduced into scientific writing by Alexandre Brongniart in 1827. The stage takes its name from the city of Oxford in England. The base of the Oxfordian stage is defined as the point in the stratigraphic record where the ammonite species ''Brightia thuouxensis'' first appears. A global reference profile for the base (a GSSP) had in 2009 not yet been assigned. The top of the Oxfordian stage (the base of the Kimmeridgian) is at the first appearance of ammonite species ''Pictonia baylei''. In the Tethys domain, the Oxfordian contains six ammonite biozones: *zone of ''Epipeltoceras bimammatum'' *zone of ''Perishinctes bifurcatus'' *zone of ''Gregoryceras transversarium'' *zone of ''Perisphinctes plicatilis'' *zone of ''Cardioceras cordatum'' *zone of ''Quenstedtoceras mariae'' 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「Oxfordian (stage)」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.