464 



DK. A. JOWETT ON THE 



[Oct. 1913, 



green sandstone. As the strike is here parallel to the coastline, not 

 many different lava- flows are exposed. 



At the liock of St. Skae occurs another dyke 1 of porphyrite, 

 which is intruded in close proximity to an important fault. The 

 dyke and silicified fault-breccia together form a vertical wall of rock 





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rising from the beach to a height of over TOO feet, and projecting 

 from the cliff southwards across a small bay which is flanked on 

 each side by steep cliffs. The ' Rock ' has been tunnelled by the 



1 G-eol. Surv. 1-inch map, Sheet 57. 



