About: Aalter Formation   Sponge Permalink

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The Aalter Formation is a fossil-bearing geologic formation in the subsurface of northwest Belgium. The formation consists of marine clay and sand, deposited in the shallow sea that covered northern and central Belgium during the Eocene epoch.

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  • Aalter Formation
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  • The Aalter Formation is a fossil-bearing geologic formation in the subsurface of northwest Belgium. The formation consists of marine clay and sand, deposited in the shallow sea that covered northern and central Belgium during the Eocene epoch.
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  • The Aalter Formation is a fossil-bearing geologic formation in the subsurface of northwest Belgium. The formation consists of marine clay and sand, deposited in the shallow sea that covered northern and central Belgium during the Eocene epoch. The Aalter Formation crops out in the provinces of East- and West-Flanders and forms a maximally 30 meters thick layer in the subsurface. To the east, the formation wedges out and becomes thinner. Due to this wedging out, the formation does not occur anymore in the province of Antwerpen. The base of the formation consists of glauconiferous clay sand alternating with organic rich (humus and peat) layers (the Aalterbrugge Member). On top of this is a sequence of clay, sand and sandstone layers, rich in fossils (the Beernem Member). The top of the formation consists of fossil rich, glauconiferous fine sand (the Oedelem Member). The Aalter Formation was formed during the late Ypresian to early Lutetian ages, giving it an age of around 48 million years. It is part of the Zenne Group and is covered by the Brussel Formation. If the Brussel Formation is absent, the Lede Formation can be found on top of the Aalter Formation. Both are like the Aalter Formation part of the Zenne Group. Stratigraphically below the Aalter Formation are deposits of the Gentbrugge Formation (late Ypresian marine clays and sands).
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