ECONOMIC GEOLOGY 191 



and at Higginsville in Oneida county, from this formation. The 

 nearness of the Medina sandstone, with its more accessible quar- 

 ries and superior stone, has prevented the more extensive devel- 

 opment of the quarrying industry in the sandstone of the Clinton 

 group. 



Oriskany sandstone 



The Oriskany sandstone formation is best developed in Oneida 

 and Otsego counties. The rock is hard, silicious and cherty in 

 places, and generally too friable to make a good building stone. 

 No quarry of more than a local importance is known in it. 



Cauda galli grit and Schoharie grit 



These rocks aire limited to Schoharie and Albany counties and 

 to a very narrow belt which stretches south and thence south- 

 west to Ulster county. The Cauda galli sandstones are argilla- 

 ceous and calcareous and are not durable. They are used in 

 Albany county for road metal, but are not very good for this 

 purpose. » The Schoharie grit is generally a fine-grained, calcare- 

 ous sandrock which also is unsuited for building. Quarries in 

 these rocks have local use only. 



Marcellus shale 

 As its name implies, this formation is characterized by shaly 

 rocks, which are not adapted to building. The abundance of 

 good building stone in the next geologic member below it — the 

 Corniferous limestone — whose outcrop borders it on 'the north 

 throughout the central and western parts of the state, also pre- 

 vents any use which might be made of its stone. A single quarry 

 was at oine time opened in it at Chapinville, Ontario* county. 



Hamilton group 



The rocks of the Hamilton group outcrop in a narrow belt, 

 which runs from tine Delaware river, in a northeast course, across 

 Sullivan and Ulster counties to the Hudson valley near Kings- 

 ton; thence north, in the foot-hills, bordering the Catskills, to 

 Albany county; then, bending to the northwest and west across 

 the Helderberg mountains into Schoharie county; thence imoreais- 



