Ch. IV.] SCHISTOSE GROUP OF CORNWALL. 



Fig. 8. 



57 



Ground plan. 



Section. 



Pengersic Cove, Mounts Say, Cornwall. 



From the examples which have been adduced, we derive 

 the important fact that the insulated beds or courses of 

 granitic rocks always partake of the nature of the containing 

 slate, which is not surprising, since it has been shown in this 

 and the second chapter that both kinds of rocks have re- 

 spectively the same bases. 



Let us now turn our attention to the schistose groups of 

 other countries; referring those, who are desirous of ob- 

 taining more minute details concerning the varieties and 

 localities of the Cornish crystalline slates, to the fourth 

 volume of the Geological Transactions of Cornwall. 



