68 PALAEOZOIC TIME. [CHAP. V. 



mence a new period of geological time. The history of this 

 depression belongs to the next chapter, but it has this con- 

 nection with the geography of Devonian times, that the 

 relative height of different portions of the Devonian con- 

 tinent may be indicated by the relative age of the Carboni- 

 ferous beds which lie upon them. 



