older Deposits of the North of Germany and Belgium. 



265 



Even in those districts where the igneous rocks have not risen much to the 

 surface, the strata are continually seen in the most convulsed positions. The 

 banks of the Lahn between the baths of Ems and the mouth of the river offer 

 striking examples of contorted strata. In one spot near Horein, laid open by a 

 new road, we found the harder arenaceous beds wedging out among the slates, 

 while the whole mass was highly inclined, broken, and contorted. 



Fig. 7. 



Banks of the Lahn near its mouth. 



Our woodcut represents these appearances on the face of a rock not more than 

 thirty feet high and fifty feet wide. 



At the iron works still lower down the Lahn, the fossiliferous flagstones (charged 

 with Delthyris, Homalonoti, &c.) are in vertical masses, the higher ends of which 

 stand up like prisms of basalt ; and the faces of the beds, showing the strike to 

 be N.N.E. and S.S.W., are nearly at right angles to the general bearing of the 

 country. 



At Ehrenbreitstein (see woodcut, fig. 8.) the fortress stands upon beds dipping 

 from 50° to 60° to the north ; while the little forts a few hundred yards to the south 

 of it are separated by a great fault, and are on beds which are almost horizontal. 

 Further north the strata are violently contorted and nearly vertical. 



Fig. 8. 



Dislocations and Contortions at Ehrenbreitstein. 



N. Ehrenbreitstein. Forts. 



These are examples, on a small scale, of the dislocations to which the rocks 

 above described have been subjected. But it would be idle for us to accumulate 



