Rupel Group

The Rupel Group can be 250 meters thick at maximum. During the Rupelian age Belgium was covered by a shallow sea. The formations of the Rupel Group therefore have a shallow marine to near coastal facies.

The group is subdivided into three formations: the Bilzen Formation (yellow-white glauconiferous fine sand, containing fossils), the Boom Formation (a thick clay deposit, containing loam layers and septaria) and the Eigenbilzen Formation (strongly layered sands).

The Rupel Group lies stratigraphically on top of the late Eocene Tongeren Group (Sint Huibrechts-Hern Formation or Zelzate Formation) or Maldegem Formation. The group can be covered by a range of younger formations, such as the late Oligocene Voort Formation, the Miocene Berchem Formation or Bolderberg Formation or the Pliocene Kattendijk Formation.

• Dumont, A.; 1849: Rapport sur la Carte géologique du Royaume, Bulletin de l'Académie royale de Belgique 16 (2^ième partie), p. 370 ((in French))
• Laga, P.; Louwye, S. & Geets, S. (eds.); 2001: Paleogene and Neogene lithostratigraphic units (Belgium), Geologica Belgica 4(1-2), p. 135-152

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