Kortrijk Formation
Stratigraphic range: Ypresian
~54 Ma

PreЄ

Type| Geological formation
Unit of| Ieper Group
Sub-units| Mont Héribu Member
Orchies or Saint-Maur Member
Moen or Roubaix Member
Aalbeke Member
Underlies| Tielt Formation
Overlies| Landen Group
Tienen & Hannut Formations
Thickness| up to 125 m (410 ft)
Lithology
Primary| Marine claystone
Location
Region| Hainaut, West Flanders, East Flanders & Walloon Brabant
Country| Belgium
Extent| Campine Basin
Type section
Named for| Kortrijk
Region| West Flanders

The Kortrijk Formation (Dutch: Formatie van Kortrijk; French: Formation de Courtrai; abbreviation: Ko; named after the West Flemish city of Kortrijk) is a geologic formation in the Belgian subsurface. This formation crops out in northern Hainaut, southern West and East Flanders and in Walloon Brabant. The formation consists of marine clay from the Ypresian age (early Eocene, about 54 million years old).[1][2]

## Contents

* 1 Description
* 1.1 Subdivision
* 2 See also
* 3 References
* 3.1 Bibliography

## Description

The Kortrijk Formation consists predominantly of clay, sometimes sandy or silty. The formation generally becomes sandier to the east, in Brabant and the Campine area. In some places fossils or bioturbation occur. In the westernmost part of Belgium it can be 125 metres (410 ft) thick, but it gradually wedges out to the east.[2]

### Subdivision

The Kortrijk Formation is subdivided into at least four members: the Mont Héribou, Orchies or Saint-Maur, Moen or Roubaix and the Aalbeke Member. The Kortrijk Formation forms the lowest part of the Ieper Group and is stratigraphically overlain by the younger Tielt Formation (late Ypresian marine sand), part of the same group. The Kortrijk Formation lies on top of late Paleocene formations like the Tienen Formation or Hannut Formation, both part of the Landen Group.[1][2]

## See also

* List of fossiliferous stratigraphic units in Belgium
* Ypresian formations
* Fur Formation of Denmark
* London Clay Formation of England
* Silveirinha Formation of Portugal
* Wasatchian formations
* Nanjemoy Formation of the eastern United States
* Wasatch Formation of the western United States
* Itaboraian formations
* Itaboraí Formation of Brazil
* Laguna del Hunco Formation of Argentina

## References

1. ↑ 1.0 1.1 Steurbaut, 2006, p.76
2. ↑ 2.0 2.1 2.2 Kortrijk Formation \- National Commission on the Stratigraphy of Belgium

### Bibliography

* Steurbaut, Etienne; De Ceukelaire, Marleen; Lanckacker, Tim; Matthijs, Johan; Stassen, Peter; Van Baelen, Hervé; Vandenberghe, Noël (2017), An update of the lithostratigraphy of the Ieper Group, National Commission for the Stratigraphy of Belgium, pp. 1–79, https://ncs.naturalsciences.be/sites/default/files/Litho Ieper Group 201702.pdf, retrieved 2020-09-07
* Steurbaut, Etienne (2006), "Ypresian", Geologica Belgica 9: 73–93, https://popups.uliege.be/1374-8505/index.php?id=1101, retrieved 2020-09-07
* Laga, P.; Louwye, S.; Geets, S. (2001), "Paleogene and Neogene lithostratigraphic units (Belgium)", Geologica Belgica 4 (1–2): 135–152, doi:10.20341/gb.2014.050, https://popups.uliege.be/1374-8505/index.php?id=1954, retrieved 2020-09-07

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