• Source: Kortrijk Formation

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).




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.




= 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.




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






= 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 (PDF), National Commission for the Stratigraphy of Belgium, pp. 1–79, retrieved 2020-09-07
Steurbaut, Etienne (2006), "Ypresian", Geologica Belgica, 9: 73–93, 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, retrieved 2020-09-07

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