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Tongeren Group : ウィキペディア英語版 | Tongeren Group The Tongeren Group is a lithostratigraphic unit (a sequence of rock strata) in the subsurface of Belgium. It consists of shallow marine, epicontinental and/or continental clays and sands from the late Eocene to early Oligocene epochs (between 37 and 30 million years old). The Belgian Tongeren Group correlates with the Dutch Tongeren Formation. The name was introduced by André Hubert Dumont in 1849. ==Subdivision== The Tongeren Group is subdivided into three formations. From top to bottom these are: *the Borgloon Formation, lagunal or fluvial shell rich sand and clay; *the Sint Huibrechts-Hern Formation, marine shell bearing sand and clay; *the Zelzate Formation, shallow marine glauconiferous sand with thin clay layers.
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「Tongeren Group」の詳細全文を読む
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