92 NEW YORK STATE MUSEUM 



is some flagstone sold, mainly by the quarries at Burke, for shipment 

 to Montreal. 



The so-called Hudson River group is essentially a group of sand- 

 stones, shales, slates and conglomerates, ranging in age from the 

 Trenton to the Lorraine, but which have riot been sufficiently studied 

 to permit the actual delimitation of the various members on the 

 map. The group is exposed in a wide belt along the Hudson from 

 Glens Falls southward into Orange county and also in the Mohawk 

 valley as far west as Rome. The sandstone beds are usually fine- 

 grained, of grayish color and rather thinly bedded. Over wide 

 stretches they provide practically the only resource in constructional 

 stone and consequently they have been quarried at a great number 

 of places to supply the local needs for building and foundation 

 work. Some of the stone is crushed for road metal and concrete. 



The Medina sandstone is found along the southern shore of Lake 

 Ontario from the Niagara river east to Oswego county; in central 

 New York it is represented by a coarse conglomeratic phase called 

 the Oneida conglomerate. As developed in the western part of the 

 State, where it is principally quarried, it is a hard fine-grained 

 sandstone of white, pink and variegated color. The pink variety 

 is specially quarried for building stone and has an excellent reputa- 

 tion. Many of the large cities of the country and most of the im- 

 portant towns and cities of the State contain examples of its archi- 

 tectural use. The large quarries are situated in Orleans county, 

 near Albion, Holley and Medina, along the line of the Erie canal, 

 but there are others at Lockport and Lewiston, in Niagara county 

 and at Brockport and Rochester in Monroe county. The Medina 

 sandstone also finds extensive application for curbing and flagging 

 and for paving blocks. It is employed more extensively for the 

 latter purpose than any other stone quarried in the State. 



The Shawangunk conglomerate is more widely known for its 

 use in millstones than for constructional purposes. It outcrops 

 along Shawungunk mountain in Ulster county and southwesterly 

 into New Jersey, with an outlier near Cornwall, Orange county. 

 The quarries near Otisville have supplied considerable quantities of 

 stone for abutments and rough masonry. 



The Clinton sandstone is mainly developed in central New York, 

 being absent from the Clinton belt in the western part of the State. 

 It forms ledges of considerable extent on the south side of the 

 Mohawk valley from Ilion to Utica and beyond. It consists of 



