Aachen Formation

The Aachen Formation (Dutch: Formatie van Aken; German: Aachen-Formation) is a Cretaceous Period geologic formation in the southern Netherlands and northern Belgium, and adjacent Germany.

Aachen Formation
Stratigraphic range: 85.8 - 70.6 million years
TypeGeological formation
Unit ofChalk Group
UnderliesVaals Formation
OverliesLimburg Group
Lithology
PrimarySand
Location
RegionSouthern Netherlands and northern Belgium, and adjacent Germany
Type section
Named forAachen

It is part of the Chalk Group and named after the German city of Aachen.

Geography

The formation crops out in southern Belgian and Dutch Limburg and adjacent areas in Germany. The formation can also be found in the subsurface of West-Flanders, where it forms an aquifer from which drinking water is won.

Geology

The Aachen Formation consists of glauconite bearing sand. It was deposited during the Santonian and Campanian ages (85.8 - 70.6 million years ago) of the Cretaceous Period in the Mesozoic Era.

Its base is an unconformity on top of Carboniferous rocks of the Limburg Group, which are more than three times as old. On top of the Aachen Formation is the Vaals Formation, also part of the Chalk Group.

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See also

References


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