SCIENTIFIC SURVEY. 245 



Mt. Battie are all small, and are not always elongated or flattened. 

 But the localities of the altered ones are so common that we 

 think no one could fail to discover them. Good examples were 

 seen on the top of the mountain, both at the south and northern 

 ends. Two sets of joints cross the strata — one running N. "75° W., 

 and the other N. 10° E.— which sometimes cut the pebbles in two. 



Our last year's estimate of the thickness of the strata of this 

 mountain at 500 feet we will not change. The height of the moun- 

 tain is about 1,000 feet above the bay at its base. One can hardly 

 resist the conviction that Mounts Battie and Megunticook have 

 been elevated to their present height by a "convulsion of nature," 

 rather than the quiet and gradual way in which ranges of moun- 

 tains are normally elevated. The section in Fig. 41 confirms this 

 view ; for what is more likely than that the quartz rock in Rock- 

 port, bb, forms a great synclinal axis with I, the conglomerate of 

 Mt. Battie ? The fault then must be found, if anywhere, between 

 k and I. 



In Fig. 38 a narrow band of quartz rock is exhibited west of the 

 Meadow's quarries in Thomaston. Whether this is to be consid- 

 ered a part of the formation we have been describing, or as a mem- 

 ber of the Taconic schists, we know not. We had not time to 

 trace it through its whole extent, still we think it quite limited. 

 It dips 50° N. 50° W., or away from the limestone. Still it may 

 be repeated by an anticlinal, which we suppose to exist, although 

 the rocks cannot be seen, before the limestone is reached, and thus 

 underlie it in the normal way. Some of these quartz layers are 

 calcareous, and resemble dark siliceous slate. Others are bright 

 colored ; and some show the constituent grains of silica distinctly. 

 The mica schist to the west has a still higher dip in the same 

 direction. The belt is a dozen rods wide. 



5. Eolian Limestone. 



The name suggested by Professor Emmons for the principal belt 

 of Taconic Limestone, was Slockbridge Limestone, from the town of 

 Stockbridge, in western Massachusetts, where are large quarries 

 of marble. For geological reasons my father suggested* a change 



*See Final Report upon the Geology of Vermont, Vol. 1, page 395. 



