QUAfeRV MATEiRlALS OiP i^fiW VoRK 



83 



for foundation and construction work. Some variations, notably 

 the coarse pink and white porphyritic phase, might find use for 

 monumental stone. The convenient situation in regard to railroad 

 facilities is an advantage not possessed by most of the localities 

 where granite of similar character is exposed in the Adirondacks. 

 The section as measured along the winding route of the railroad 

 extends about 8 miles in a general east and west direction. The 

 first exposure on the west is near railroad milestone 56, which refers 

 to Sacketts Harbor as the initialpoint, and the eastern border where 

 the granite gives way to a well-foliated gneiss may be taken ap- 

 proximately at milestone 64, but is not sharply defined. The distance 

 from Carthage, an important railroad center, is 25 miles, and from 

 Watertown 40 miles. 



MILES 



Fig. 7. Sketch map of the section along the Carthage and Adirondack 

 Railroad from Natural Bridge to Oswegatchie 



The exposures occur on both sides of the railroad in a series of 

 ridges and hills that lend a rugged aspect to the topography though 

 they seldom rise over 200 or 300 feet above the valley bottoms. 

 They have no definite structural trend, in contrast with the regular 

 north-east-south-west alignment of the ridges and valleys underlain 

 by the older gneisses. The hills are more or less rounded, often 

 hummocky on the summits, but there is little evidence of profound 

 6 



