Kortrijk Formation

Kortrijk Formation
Stratigraphic range: Ypresian ~54 Ma PreꞒ Ꞓ O S D C P T J K Pg N ↓
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]