Excursion 2 visited the extended quarry of the ENCI (First Netherlands Cement Industry), near Maastricht. Here Maastricht-chalk and the upper part of the Gulpen- chalk could be seen. In both parts a great number of flintlayers could be studied. In the surroundings of Eben-Emael (Belgium) two quarries, where flint is extracted for use in industrial mills and ovens, were visited. At the Garcet-quarry flint is exploited by means of horizontal galleries.