1847.] The Limestones, and Lime. 121 



middle and western counties of New- York. As a general mass, 

 it is unimportant; as a local deposit, it becomes important in con- 

 sequence of the scarcity of calcareous matter in the region where 

 it occurs. We believe it is confined to the state of New-York. 



99.60 

 The Tully limestone is an important variety, for the lime which 

 it may furnish for agricultural purposes. It is dark colored, com- 

 pact, or only sub-crystalline. 



In the geological series, superior to the New-York system, im- 

 portant beds of limestones occur, which it is proper to notice in 

 this place. Thus, in Formation XIII., of Rodgers' Pennsylvania 

 Report, we find the following analyses: — 



First. Second. 



Carbonate of lime, - 96.10 96.90 



Carbonate of magnesia, - none none 



Alumina and oxide of iron, 1.30 0.50 



Insoluble matter, - - 2.30 2.90 



Water, - - - - 0.30 0.30 



100.00 



The first limestone occurs in Butler county. Pa. Color light 

 gray; compact or close grained; fracture smooth and slightly con- 

 choidal; fossiliferous — containing stems of enciinites. 



The second occurs in Clarion county. Its characters and ap- 

 pearance are much the same as the preceding. 



We give two additional analyses of limestones from the same 

 formation, but from different parts of Pennsylvania. 



First. Second. 



Carbonate of lime, - 84.00 94.00 



Carbonate of magnesia, - none none 



Alumina and per oxide of iron, 1.00 1.30 



Insoluble matter, - - 12.80 4.30 



Water, - - - 0.45 0.40 



Loss, .... 1.50 0.00 



100.00 100.00 



