MW rOBS STATE MUSEUM 



not qui ree with an analysis made by the writer, 

 which represents an i e of the quarry as follows: 



Lime earl 59 . 84 



Magnesium carbonate uG.8 



Alumina .4 



Pd rrie <>.\id .25 



Silica , 2.31 



99.6 



A small quarry was once in operation near Scarsdale, but the 

 ii tains considerable mineral impurities. 

 !line limestone extends up the valley of Annsville cove 

 and Sprout brook for several mile?, and is exposed at a number 

 of phi' ■ -daily along the line of the narrow gage railroad 



leading up to the Edison magnetite mines. The best exposure of 

 this is in the quarry 1} miles west of Peckskill rock. The rock 

 a fine grained, grayish white stone, which seems to be the 

 ter quality toward the eastern end of the mine, where it is of 

 a darker color. The working face exposed is over 75 feet long. 

 The following analysis made by J. D. Irving shows the composi- 

 tion of the stone, and illustrates the point that far less magnesia 

 ists in this limestone than is found in other portions of West- 

 ster county. 



Silica 2.5 



rio oxid and alumina 1.55 



Time carbonate , 81 . G4 



Magnesium carbonate 13.5 



99.19 



r ' posures of this same rock outcrop, as low ledges on 



M r 1 1 iggins about 2£ miles from Peckskill village. 

 v a stone of considerable purity, while 

 rather micaceous. 



