34 



JOANNES RASMUSSEN 



boundary of the coal area. The clays are all fire-resistant and without plasticity. 

 The thickness of the individual coal bands in the profile section varies some- 



FiG. 3. Profile through the Coal-bearing series. 



what from place to place. In the northern area the lower coal band is thicker 

 than the upper one, whereas the contrary is the case in the southern area. 



