On the frontier of the municipalities “Melick en Herkenbosch” and “Vlodrop” near the road from Herkenbosch to boundery-mark 376, in the site named “Koezoep”, in the province ofLimburg, Netherlands, is a peat swamp, known as the “Turfkoele”. From the geological map (no. 58, fourth part sheet 4) it appears that the peat under the swamp has been formed on a deposit of river sand. This deposit has come from the Roer and lays on the middle terrace of this river and of the Meuse.