THE MISSISSIPPIAN PERIOD 



605 



Europe, by wide-spread crust al disturbances. It was at this time 

 that a great system of mountains, sometimes called the Paleozoic 

 Alps, began its development. These mountains crossed central 

 Europe from east to west. Their remnants are seen in the Vosges, 

 Black Forest, Harz, Sudetes, etc., mountains of the present time. 



Fig. 428. Map showing the relations of land and water in Europe in the 

 early Carboniferous period. The shaded parts represent areas of marine 

 deposition. (After DeLapparent.) 



The development of the Ural Mountains appears to have begun at 

 the same time. Geographic changes which were not deformative 

 were also in progress, shifting somewhat the areas of sedimentation. 

 In Europe as in America, therefore, there is a notable break be- 

 tween the Lower and Upper Carboniferous, as shown by unconform- 

 ities at many points. The distinctness of the two systems is further 

 emphasized by their unlike distribution, and by the physical un- 

 Ukeness of their formations. 



