M \\ ^ OSS i If 



i ii;i/v and Trenton limestones occur 

 in • The first forma Willsboro poinl and extends 



Whallonsburg. A Becond area begins at 

 \V< ads southward to the town of that name. A 



third ia on Larrabees point. 



Black river Limestone member of the Trenton is usually 

 bedded, very tough and compact. The rock lias been 

 < r-.w d point. 

 The Trenton proper, also exposed on Crown point, is 150 feet 

 thick, but fa usually thin bedded, Bhowing alternations of liuie- 

 and shale layers. The Trenton has been used at several 

 places for making lime, bu1 no definite statement can be made 

 ning the purity of any given bods, as they are variable. 

 the rock Lb quite Low in silica. Large quarries have 

 ii opened on Willsboro poinl (pi. 38), and in the town of Es- 

 . and the stone from the former was shipped to New York city. 

 A partial analysis of the Chazy limestone on Willsboro point, 

 furnished the writer by Prof. J. F. Kemp, showed: 



Lime 51 



Magnesia 1 



- ca 2.43 



The following represent the average composition of 1) the 

 upper 10 '1 2) the lower 10 feet of the quarry from anal- 



Bamples collected by the writer. 



1 2 



Silica 4.4 4.6 



Alumina 7.1 4.1 



ozid 3.5 1.9 



Lime carbonate 79.2 87.7 



:arbonate 4.2 .98 



' able 15 12. G 



2 



allowing additional ones are given by T. G. White. 1 



11 Is of quarr v on Willsboro point. 



Willsboro townships, Essex co., N. Y. (see Trans. 

 I 



