|
The Tongeren Formation ((オランダ語:Formatie van Tongeren); abbreviation: TO) is a geologic formation in the subsurface of the Netherlands. The formation consists of shallow marine, epicontinental and continental sediments, predominantly clay and sand from the late Eocene and early Oligocene epochs (between 37 and 30 million years old). The Tongeren Formation is part of the Middle North Sea Group and correlates with the Tongeren Group from Belgian stratigraphy. The name was introduced by Belgian geologist André Hubert Dumont in 1849. ==Lithologies and subdivision== The Tongeren Formation is subdivided into three members: *the Goudsberg Member, an alternation of clay with chert nodules and thin lignite layers; *the Klimmen Member, micaceous fine sand; and *the Zelzate Member, shallow marine glauconiferous sand alternating with 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 Formation」の詳細全文を読む スポンサード リンク
|