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2.11.1. Bilzen Formation - Bi


The name was for the first time used in a publication by Marechal (1993). Bilzen is a village in South East Limburg. It is also the name of the geological map made by Van Den Broeck (1883) and Van Den Broeck & Rutot (1883).

General characteristics

The Bilzen Formation is only encountered in the Hageland and Limburg. The formation consists essentially of sandy sediments (the Kerniel Member and the Berg Member) with a clayey intercalation (the Kleine-Spouwen Member). The formation rests on the underlying Tongeren Group. The upper boundary is with the superjacent Boom Formation.


The formation crops out in the south of the Hageland and Limburg. Further north, the formation occurs in the deeper parts of the subsurface of the eastern Campine.


Kerniel Member, sand;

Kleine-Spuwen Member, clay and marl;

Berg Member, sand.

Former designations

Geological map 1/40.000: R1 + R2a + R2b

Stratigraphical register (1929, 1932): R1 + R2 p.p.

New geological map 1/50.000: Bi