476 



Scientific Geology. 



(3) Junction of Granite and Mica Slate ; Westminster. 



At b, a mass of coarse granite occupies the top of a hill of consid- 

 erable altitude. As we approach the road, descending from the hill, 

 the granite is mostly concealed by diluvium. At a, however, mica 

 slate appears running nearly east and west. A few rods to the west 

 at d, it runs nearly north and south ; which is the usual direction of the 

 slate in that region. What but the disturbing force of the granite 

 could have turned the mass a, nearly 90 degrees. 



No. 4 exhibits a protruding mass of coarse granite 20 or 30 rods 

 long in mica slate. The slate does not seem to be disturbed. It has 

 an easterly dip of about 80°. The sketch was taken in the northwest 

 part of Norwich. 



(4) Protruding- Mass of Granite in Mica Slate. Norwich. 



The following sketch was taken near the road from Norwich to 

 Chester village, a little after we begin to descend the high hill on 

 which Norwich stands. Over many acres in that place the mica slate 

 and granite are mixed in the greatest confusion : but I could sketch 

 only limited patches, and of course it is scarcely possible to give a 



