536 



ON THE CRYSTALLINE SCHISTS OF THE MALVERN HILLS. 



other. The Simple Schists described are hornblende-gneiss, formed 

 from diorite, mica-gneiss from granite, and mica-schist from felsite. 

 The Injection-schists noticed were duplex diorite-gneiss, composed 

 of veins of diorite in diorite, and granite-diorite-gneiss, of veins of 

 granite in diorite. 



In conclusion it was observed that : — 



(1) Particular varieties of gneiss and schist generally occurred in 

 the vicinity of the igneous masses to which they were most nearly 

 related in mineral composition. 



(2) No true stratification was detected, the bands of igneous and 

 of foliated rocks thinning out rapidly, in the manner of veins. 



(3) The received view of the age of the greater part of the rocks 

 was not affected by the conclusions of the Author. 



(4) The chief metamorphism was completed before the Cambrian 

 epoch. 



(5) Some, at least, of the schistosity had been caused subsequent 

 to consolidation. 



(For the Discussion on this paper, see p. 514.) 



