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. https://ncs.naturalsciences.be/lithostratigraphy/Hannut-Formation |
| Additional information | The formation is also discussed by Baudet (1939), Cornet (1899), De Geyter (1980, 1981), D’Omalius d’Halloy (1939, 1842), Gullentops et al. (1995), Gulinck (1948), Gulinck & Hacquart (1954), Kaaschieter (1961), Lyell (1852a), Macar et al. (1947), Maréchal (1993), Moorkens (1972b, 1982), Nijs & De Geyter (1985), Steur-baut (1998) and Vincent & Rutot (1879). |
