Aachen Formation
Upper Cretaceous geologic formation
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The Aachen Formation (Dutch: Formatie van Aken, German: Aachen-Formation) is an Upper Cretaceous geologic formation in the southern Netherlands and northeastern Belgium and adjacent Germany.[1]
| Aachen Formation | |
|---|---|
| Stratigraphic range: Santonian-Campanian ~ | |
The Aachen Formation in Hergenrath | |
| Type | Geological formation |
| Underlies | Vaals Formation |
| Overlies | Limburg Group |
| Lithology | |
| Primary | Sandstone |
| Location | |
| Coordinates | 50.8°N 5.9°E |
| Approximate paleocoordinates | 40.8°N 7.3°E |
| Region | Dutch Limburg, Belgian Limburg, North Rhine-Westphalia |
| Country | Belgium, Germany, Netherlands |
| Type section | |
| Named for | Aachen |
| Region | North Rhine-Westphalia |
| Country | Germany |
  Aachen Formation (Netherlands) | |
It is stratigraphically equivalent to the middle part of the Chalk Group of England, 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 to 70.6 million years ago) of the Cretaceous Period.
The formation rests unconformably on top of Carboniferous rocks of the Limburg Group, which are more than three times as old. Overlying the Aachen Formation is the Vaals Formation, equivalent to the upper part of the Chalk Group of England.