334 



STRATIGRAPHICAL GEOLOGY. 



are of the same character, dipping 70° N. 52° W. Upon them are some 

 narrow ranges of conglomerate Hke that seen above the slate quarry. 

 On examining the fields back of J. K. Corey's house, we find some of 

 these ledges isolated, and others resting upon the Huronian, with the 

 same dip as the underlying strata. Next there occurs a large ledge of 

 Helderberg limestone, full of coralline and crinoidal remains. Some of 

 the limestone bunches contain irregularly shaped masses of chlorite, 

 evidently of later origin than Helderberg, or, more precisely, of the age 

 of the elevation of the fossiliferous sediment. Still farther east is a 

 mass of white quartz, full of reticulated veins. Then there succeed a 

 great many ledges of green schists, full of fragmental grains, belonging 

 to our Swift Water series, dipping like the fore- 

 going. Near J. K. Corey's house some of the 

 layers have the aspect of calcareous decompo- 

 sition. On the height of land to the south there 

 ^: S is a great abundance of embossed schistose lay- 

 1 1 ers, like those near the house, dipping 75° N. 52° 

 1 1 W. Below Corey's house the greenish, sandy 

 * I schists dip 70° N. 52° W. 



c s Another trip was made from the slate quarry 



-2 f to Corey's farm. The conditions of Fig. 42 were 



'o^ „- found up to the slate. On the ridge I found ar- 



i,-| gillaceous schists, with the high north-westerly 



■I ^ dip. The eastern slope is gradual, but so covered 



1 1 by earth that no ledges appeared. The blocks 



ffi of Huronian hornblendes and diabases suggested 



- the possible presence of ledges to connect the 



I Corey schists with those on the wooded summit 



I of Fitch hill. North from Corey's is a spur from 



-o" the main Blueberry range, running south-east- 



I erly. This proved to be the same greenish, sandy 



I schists with those before described, dipping to 



•^, the north-west. 



The next section in Fig. 43 is three and three 

 eighths miles long, and passes over more strata. 

 It begins high up the early course of Mulliken's brook, crosses Blueberry 



