34 



NEW YORK STATE MUSEUM 



The microscope shows that the grains, which are mostly quartz, 

 are well rounded and encased in limonite. Some of them have 

 become enlarged by secondary growth, thus making the stone 

 compact and firm. Weathered feldspar and plagioclase make up 

 a large part of the section. Some ore grains, probably magnetite 

 and pyrite, are scattered through the mass. The texture is quite 

 even, the grains averaging .30 millimeter in diameter. 



19 Sandstone 



Warsaw, Wyoming co. N.Y. 



WARSAW BLUESTONE CO. 

 See plate 21 



This sandstone, used for building purposes, has a bluish gray 

 color, is rather loose and of a fine grain and even texture. 



The rock is made up mostly of very fine subangular grains of 

 - quartz and weathered feldspar cemented together by calcite. 

 Biotite and muscovite scales, chlorite, recrystallized quartz, some 

 ilmenite and other ore grains were also noted in the section. 



5 Limestone 



Sandy Hill, Washington co. N.Y. 



HIGLEY & BARBER 

 See plate 22 



The stone from this locality is fine grained and bluish gray and 

 is used mostly for building purposes. It is quite hard and compact 

 and the texture, as a whole, is fairly even, though it varies some- 

 what to a coarser grain. 



The microscope revealed more or less angular crystals of calcite 

 cemented firmly by a fine grained cloudy calcareous material. 

 Some rounded quartz grains and a few pyrite grains were also noted 

 in the section. 



12 Limestone 



Little Falls, Herkimer co. N.Y. 



P. KEARNEY 



See plate 23 ^~ 



The stone from this quarry, which is used locally as a building 

 stone, is light gray in color, fairly compact and, as a whole, fine 

 grained. It is made up of dolomite rather than calcite. 

 The microscope showed it to be composed of good crystals of 



