Protrusions of Gra?iite. 



477 



correct view of all the disturbance that has taken place. The sketch 

 below embraces a space about 8 rods long and 3 rods wide, e, g, h, 

 are protruding masses or veins of granite, a, b, c, d, show the bas- 

 set edges of mica slate. At a, its strata run nearly north and south 

 and dip rather less than 45° to the west : which is the usual dip and 

 direction in the vicinity. At b and c, the strata are turned so as to 

 run nearly northeast and southwest ; but the dip is increased only a 

 few degrees. At d they are still more wheeled, and the dip is as 

 high as 60° or 70°. 



(5) Granite and Mica Slate ; Norwich. 



The next case is at the same place, and embraces a space about 16 

 rods long, a, a, b, n, n, m, m, are veins of granite from one to two 

 feet w r ide, and c, a mass 10 feet wide. A large mass also lies on the 

 side d, d. At h, the mica slate is deflected only a few degrees from 

 the usual course of its strata, which is nearly north and south. The 

 dip there is 45° northwest. But in every other part of the sketch, it 

 will be seen that the mica slate is turned almost at right angles to its usu- 

 al course, and towards the lower part of the sketch it exhibits most re- 

 markable curvatures. The dip also, is in general greatly increased ; 

 so that in the vicinity of e, it is 80° north. 



I feel the inadequacy of such sketches to convey a just idea of the 

 very great confusion which this spot exhibits. But if any one can 

 examine such places and still maintain that granite was not forced up 

 through the slate while in a fused state, I can only say that his mind 

 must view facts in a very different light from my own. 



