Q2 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 not 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 
