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Houthem Formation
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Houthem Formation : ウィキペディア英語版
Houthem Formation
The Houthem Formation, named after the Dutch town of Houthem, is a geological formation that crops out in the south of Belgian and Dutch Limburg. It has also been found in borings in the northeastern part of the Campine Basin. The formation consists of calcareous sandstone and was formed about 60 million years ago, in the Paleocene epoch.
==Lithology==
The Houthem Formation consists of maximally 30 metres of light grey to light yellow calcareous arenites. The arenite can contain calcareous concretions, fossils and hardgrounds with shell fragments. At other places lenses of boundstone occur, formed by red algae.
The hardgrounds make it possible to subdivide the formation into three members: the Geleen Member, the Bunde Member and the Geulhem Member.

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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