X ; 5 BERLIN coal needed for heating. Most of the % 7' .ONO RUHR ...
early shallow coal mining, but the basin also continues eastnortheast at increasing depths through Dortmund and beyond. 2. The Stockum Saddle is a sharp anticline. In most of it the leancoal strata only are present. 3. The Bochum Basin is important, since in it part of the richcoal strata are preserved near the surface.