496 



Scientific Geology. 



Granite Veins in Micaceous Limestone : Conway. 



In the same town and near the same spot, may be seen the original 

 of No. 39. We have here a vein of granite, 40 inches wide, which 

 sends off two branches ; the first at an angle of 20 and the second 

 at an angle of 50. Both the branches are 18 inches wide, and the 

 portion of the vein which continues in a direct course is 14 inches 

 wide. Intersecting these veins of granite, we find several of quartz, 

 whose width varies from one inch to 3 inches ; ana 1 whose direction 

 corresponds with that of the contiguous layers of mica s^ate. The 

 probability is that these, like most other quartz veins, were the result 

 of the infiltration of siliceous matter into fissures previously produced 

 deccation or mechanical force. 



(39) Granite and Quartz veins in Mica Slate ; 

 Conway. 



