| Ieper Group Groupe d'Ypres | |
|---|---|
| Stratigraphic range: Ypresian ~ | |
| Type | Geologic group |
| Sub-units | Kortrijk, Mons-en-Pévèle, Tielt, Hyon & Gentbrugge Formations |
| Underlies | Zenne Group Aalter Formation |
| Overlies | Landen Group Tienen Formation |
| Thickness | >225 m (738 ft) |
| Lithology | |
| Primary | Sandstone, claystone |
| Other | Siltstone |
| Location | |
| Coordinates | 51°18′N 4°18′E / 51.3°N 4.3°E |
| Approximate paleocoordinates | 46°42′N 1°30′E / 46.7°N 1.5°E |
| Region | East Flanders, West Flanders, Antwerp, Hainaut, Flemish & Walloon Brabant |
| Country |  Belgium |
| Extent | Campine Basin |
| Type section | |
| Named for | Ypres (Ieper) |
  Ieper Group (Belgium) | |
The Ieper Group (Dutch: Ieper Groep; French: Groupe d'Ypres) is a group of rock strata in the subsurface of northwest Belgium. The group is subdivided into three marine formations, all formed during the Ypresian, a single age of the geologic timescale (55.8 to 48.6 million years ago, the oldest age of the Eocene epoch). Both age and group are named after the West Flemish town of Ypres, for which the Dutch name is "Ieper".