T^S M SBUli 



>und in the county are of 

 The Helderberg limestones extend 

 soutl M a belt several miles 



thorn limit p fchrongh the towns of Jordan- 



\ i 1 ! I darville and Cedar Lake. They have been 



ral places, Columbia among them, for lime bura- 

 l.ut their dial From the railroad ia a Berioua objection. 



The Tentacnlite limestone is utilized at Columbia south of 

 for the manufacture of lime, and a sample from A. 

 S quarry showed the following composition. 



Silica 4.91 



J ' nic oxid 53 



A lumina 48 



Lime 51.82 



Magnesia 1.16 



Carbon diuxid 41 . 9 



100.8 



The same quarry shows two thin layers of waterlime. 

 The group of Trenton limestones is of some importance in 

 Herkimer county, but only the Lirdseye and Trenton, members 

 are pn 



Around little Falls the Trenton is not over 4 feet thick aceord- 



to Darton, but at Tngham Willis the rock is well exposed in 



[uarry <>i Sherman Butler (pi. 41), where nearly 15 feet 



of goo can be seen. The better stone is bluish, fine grained 



. but in the upper part of the quarry it passes into 



following analyses represent its composi- 



0, no. 1 being the lower mac^ive rock and no. 2 the average 



lie quarry fa' 



1 2 



G.7 8.45 



Alumina 3.03 2.72 



