|
The Lutetian is, in the geologic timescale, a stage or age in the Eocene.〔Established by D.G. Jenkins and H. Luterbacher, "Paleogene stages and their boundaries (introductory remarks)" in ''Neues Jarhbuch fur Geologie und Paläontologie'' 1992.〕 It spans the time between . The Lutetian is preceded by the Ypresian and is followed by the Bartonian.〔Gradstein ''et al.'' (2004)〕 Together with the Bartonian it is sometimes referred to as the Middle Eocene subepoch. ==Stratigraphic definition== The Lutetian was named after Lutetia, the Latin name for the city of Paris. The Lutetian stage was introduced in scientific literature by French geologist Albert de Lapparent in 1883 and revised by A. Blondeau in 1981.〔Blondeau (1981): "Lutetian" in ''Bulletin d'information des géologues du Bassin de Paris'', 2, pp167-180.〕 The base of the Lutetian stage is at the first appearance of the nanofossil ''Blackites inflatus'', according to an official reference profile (GSSP) established in 2009.〔"The Lutetian GSSP at meter 167.85 of the Gorrondatxe section in a dark marly level where the nanofossil ''Blackites inflatus'' first appears" ((working group website )).〕 Of two candidates located in Spain, the Gorrondatxe section was chosen.〔See the (website of Eustoquio Molina ) for these candidates.〕 The top of the Lutetian (the base of the Bartonian) is at the first appearance of calcareous nanoplankton species ''Reticulofenestra reticulata''. The Lutetian overlaps with the Geiseltalian and lower Robiacian European Land Mammal Mega Zones (The Lutetian stage spans the Mammal Paleogene zones 11 through 15.), the upper Bridgerian and Uintan North American Land Mammal Ages, the upper Arshantan and Irdinmanhan Asian Land Mammal Ages and the Mustersan and lower Divisaderan South American Land Mammal Ages. It is also coeval with the middle Johannian regional stage of Australia and the upper Ulatisian and lower Nanzian regional stages of California. 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「Lutetian」の詳細全文を読む スポンサード リンク
|