Landen Formation
The Landen Formation is a lithostratigraphic unit in the subsurface of the Netherlands. This formation shares its name with the Belgian Landen Group, but the Belgian unit is thinner and has different definitions. The Landen Formation consists of shallow marine and lagoonal sediments from the late Paleocene to early Eocene. Dutch stratigraphers see the Landen Formation as part of the Lower North Sea Group.Lithology
The Landen Formation can be maximally 150 meters in thickness. It is subdivided into five only regionally recognized members:
Some of the sandy layers can have been made into sandstone by diagenetic processes. The whole formation is interpreted as one megacycle: the lower parts represent a marine transgression, while the upper parts represent a regression.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.
