■■^75 Crown Point Section 



"The upper surface of this rock is plated with a layer of 

 chert, one or two inches thick, which is spread very evenly over 

 almost the whole exposure of the rock at this point. This layer 

 is smoothed and polished by drift which has been forced over it. 

 -;: ■> * Following the shore along the bay, I found a stratum 

 about one foot thick filled with lingulge. They were confined 

 wholly to this layer, and thousands of them could have been ob- 

 tained, though from the thinness of the shell it is difficult to ob- 

 tain them in a perfect state. That part of the rock which has 

 been employed in the fortification is the Trenton limestone. As 

 in the walls, the shaly part of the stone frequently contains 

 TrhuideiLs tesselatus and Orthis testiidinaria.''' 



In a diagramatic secftion, from the town of Crown Point to 

 the fortress, he gives the following in order from south to north: 



Archsen , 



Drift, 



Potsdam sandstone, 



Calciferous sandrock. 



Drab-colored layers, 



Fault, 



Calciferous sandrock, 



Cliaz3', 



Birdseye, 



Limestone with fucoidal la3'ers. 



In the Geology of Vermont (r86i), Prof. Edward Hitchcock 

 speaks of the Chazy as being "abundantly exposed" at Crown 

 Point, and as part of an anticlinal which can be traced across the 

 lake to Chimney Point, thence northward through the Vermont 

 towns of Addison, Panton and Ferrisburgh into Charlotte. The 

 following dips and strikes are given: 



Strike. Dip. 



Crown Point N. 48° E. 9° N. W. 



Chimney Point N. K. & S. W. 8° N. W. 



