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Tournaisian
The Tournaisian is in the ICS geologic timescale the lowest stage or oldest age of the Mississippian, the oldest subsystem of the Carboniferous. The Tournaisian age lasted from Ma to Ma.〔Gradstein ''et al.'' (2004)〕 It is preceded by the Famennian (the uppermost stage of the Devonian) and is followed by the Viséan.
==Name and regional alternatives==
The Tournaisian was named after the Belgian city of Tournai. It was introduced in scientific literature by Belgian geologist André Hubert Dumont in 1832. Like many Devonian and lower Carboniferous stages, the Tournaisian is a unit from West European regional stratigraphy that is now used in the official international time scale.
The Tournaisian correlates with the regional North American Kinderhookian and lower Osagean stages and the Chinese Tangbagouan regional stage. In British stratigraphy, the Tournaisian contains three substages: the Hastarian, Ivorian and lower part of the Chadian (the upper part falls in the Viséan).〔Heckel & Clayton (2006)〕
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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