Stratigraphy
The Dutch Landen Formation is not totally equal with the Belgian Landen Group. In Belgium, the Orp and Gelinden Members are seen as one separate formation, the Heers Formation. The Dutch Landen Formation correlates with the Belgian Heers Formation, Hannut Formation, Tienen Formation and parts of the Opglabbeek Formation.
The Landen Formation lies normally on top of a nonconformity with the Dutch Chalk Group, which is usually represented by the early Paleocene Houthem Formation. In most places the early Eocene Dongen Formation is found on top of the Landen Formation.
Read more about this topic: Landen Formation