LIME AND CEMENT INDUSTRIES 799 



quarry is fairly white. The composition of the lower limestone 



runs: 



Silica 6.13 



Alumina .79 



Ferric oxid .61 



Lime carbonate 88 . 49 



Magnesium carbonate 2 . 45 



98.47 

 The upper beds showed 8.92^ of insoluble matter. There is- 

 evidently considerable variation in the upper layer, as a com- 

 parison of the foregoing analysis with the first of the following 

 three shows. They were made by J. M. Sherrerd and published 

 in 19th annual report U. S. geological survey, pt 6. 



Upper layer Intermed. Lower 



Silica 1.25 3.82 5.68 



Ferric ozid I 3 1.08 2.76 



Alumina j 



Lime 52.78 52.46 52.12 



Magnesia ,. 



Undetermined (CO s ?) 42.97 42.64 39.44 



Another limestone quarry has been opened by George Ross on 

 the eastern edge of the town. The rock has thus far been used 

 as building stone. It contains some sandy streaks, which could 

 be separated if the stone were to be burned into lime. The aver- 

 age composition of the stone is: 



Silica 7.46 



Alumina 2 . 48 



Ferric oxid 1 . 07 



Lime carbonate 71 . 76 



Magnesium carbonate 18 . 19 



This rock is probably Calciferous and not Trenton, judging 

 from its magnesian character. Portions of the rock in the eastern 

 end of the quarry run as low as 4$ in insoluble matter, v 



Other quarries have been opened at Canajoharie, Palatine 

 Bridge, and St Johnsville there being a large number at the last 

 town. 



