GEOLOGICAL POSITION AND GEOGRAPHICAL DISTRIBUTION 213 



gray In color, coarse-crystalline ; and makes beautiful ashlar 

 work, either as rock face or as fine-tooled, decorative pieces. 



The Corniferous limestone Is hard and durable, but it is 

 so full of chert that It can be used for common, wall work 

 only. 



The Seneca blue limestone is easily dressed and is a fairly 

 good building stone. 



Limestone of the Upper Helderberg epoch Is quarried 

 extensively at Kingston, Ulster county, and is a valuable 

 building stone. In Onondaga county there are the well- 

 known Splitrock and Reservation groups of quarries, which 

 have produced an immense quantity of excellent and beau- 

 tiful stone and which have found a market In all of the cen- 

 tral part of the state. They are In the lower member of 

 the group. Going west, there are the large quarries in the 

 Seneca limestone at Union Springs, Waterloo, Seneca Falls 

 and Auburn. The LeRoy, Willlamsville, Buffalo and Black 

 Rock quarries are In the Corniferous limestone. 



The aggregate output of the quarries in the Upper Hel- 

 derberg limestones exceeds in value that of any other lime- 

 stone formation In the state. The many quarries of the 

 Trenton probably produce more stone. 



TuLLY Limestone 



The Tully limestone lying above the Hamilton shales, Is 

 a thin formation, which is seen in Onondaga county and to 

 the west — on the shores of Cayuga lake — In Seneca 

 county and disappearing In Ontario county. It does not 

 furnish any stone other than for rough work and in the 

 Immediate neighborhood of Its outcrops. 



As a supplement to the limestones the quarry In calcareous 

 tufa at Mohawk, in the Mohawk valley, should here be 

 mentioned, although the quarry is of no importance and 

 there Is no great outcrop for much work in it. 



