40& 



UNITED STATES 



session of the same gentleman : they were found near 

 Concord, in Delaware county, Pennsylvania. 



Limestone.,, ^The calcareous region in general has 

 been already amply noticed in the mineralogical 

 survey of the United States. It may be here per- 

 mitted to mention some particular tracts of lime- 

 stone and marble. 



Only one vein of limestone is known below the 

 Blue Ridge in Virginia. Its first appearance is in 

 Prince William county, two miles below the Pignut 

 ridge of mountains, and is never more than one 

 hundred yards in width. From the Blue Ridge^ 

 westwardly, the whole country seems to be founded 

 on a rock of limestone, besides infinite quantities oii 

 the surface, both loose and fixed.* In New York it 

 is found in great quantities, and is every where su- 

 perficial, and bedded both on granite and schistus* 

 Near Claverack there is a mass of it about 800 acres 

 in extent, which is remarkable for its petrifactions. 

 The whole tract in New York is minutely described 

 by Dr. Mitchell. 



Pennsylvania owes much of her agricultural riches, 

 to the abundance of this excellent stone in the state* 



In Maryland it is also found in great plenty, and 

 North Carolina is crossed by a long ridge of limestone, ' 

 in a south-westerly direction. 



7kfarZ>/e.... Quarries of Marble have been opened 

 in Stockbridge, Massachuf^etts. Its quaiiiy i:- sc.g' od 

 as to make it an object of demand. The corporation 

 of the city of Nevv^ York have ordered large quan- 

 tities of it for ihe construction of their new hail ; 



* J«ferson*s Kotes. 



