AGES OF MOUNTAIN SYSTEMS. 



traced in France in the anthracite schistous beds on the banks of 

 the Loire and of the Brest canal. It is also seen in the depart- 

 ment of Mayenne, in the south-east of Laval, in the southern 

 part of the Vosges, in the chains of Lozdre, Margeride, and the 

 Corr^ze. 



In England the system is directed from Cornwall to the Gram- 

 pians, in Belgium from Avesnes to Lidge, and in Germany in the 

 Hartz mountains, which probably have received from it their pecu- 

 liar form. 



It may also be traced in Bohemia, Saxony, Sweden, Russia, 

 Siberia, in the Altai range, in North America, along the line of 

 the Alleghanies, and in southern Asia. 



211. VII. SYSTEM or THE NOBTH OF ENGLAND. The con- 

 vulsion which produced this system dislocated the coal formation, 

 h, fig. 124, and in the ^ 



tranquil period which suc- 

 ceeded the waters of the Iff 

 ocean deposited thePermian 

 strata, i. 



Its date, therefore, was 

 prior to the Permian and 

 subsequent to the carboni- 

 ferous period. This system 

 is characterised by lines 



Fig. 124. 

 Permian sea. 



g f 



c b 



of summit which extend from the parallel of Derby to the frontiers 

 of Scotland, through Yorkshire, and between Cumberland and 

 Northumberland. Traces of it are also found in the neighbour- 

 hood of Bristol, as well as in the south of Ireland. It is traced also 

 both in Norway and Sweden, upon the crests of the southern chains. 

 212. VIII. SYSTEM OF HAINATTLT. The catastrophe which pro- 

 duced this system has been manifested less by any elevated ridges 

 than by a series of dislocations and compressions which are seen 

 in England, between Pembrokeshire and Mansfield, and which 

 also traverse the Netherlands, running nearly east and west. All 

 the existing strata, and par- 

 ticularly the coal measures, 

 h, fig. 125, and the Permian 

 strata, *, exhibit these effects. 

 The strata of Vosgian sand- 

 stone are, however, undis- __ 



turbed and horizontal as they 



were deposited from the waters, k r, f d c b < 



showing that the date of this catastrophe was anterior to their 

 deposition and posterior to the Permian period. These positions 

 of the Vosgian strata are apparent at Sarrebruck. 



15 



Fig. 125. 

 Vosgiau sea. 



