Hannut Formation

The information on this page is a summary description.
The full formal description is available here: Hannut Formation

Abbreviation Hn
Parent unit Landen Group
Child units Chercq Member, Lincent Member, Halen Member, Waterschei Member, Grandglise Member
Lithological description This marine unit consists of clay, sandy clay and silt, siliceous limestone, siltstone and sandstone, mostly covered by glauconitic, fine sand.
Age Early and Middle Thanetian.
Thickness The formation thickens to the northeast and reaches more than 100 m in the Campine (Mol borehole). In the Mons Basin the maximum thickness is about 55 m. In East- and West-Flanders the thickness mostly varies between 20 and 40 m, but mark-edly decreases in the north of West-Flanders (Knokke borehole).
Area of occurrence The formation extends almost over the whole northern part of Belgium. The outcrops are mainly situated in the Hesbaye and in Hainaut.
Type locality
Alternative names
Authors Laga, P., Louwye S. & Geets, S.
Date 01/01/2001
Cite as Laga, P., Louwye S. & Geets, S., 2001. The Hannut Formation, 01/01/2001. National Commission for Stratigraphy Belgium. http://ncs.naturalsciences.be/lithostratigraphy/Hannut-Formation


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