THE MINING AND QUARRY INDUSTRY IQI2 71 
doubtless in the basal portion of the limestone area that extends 
across Washington and Warren counties. The only place where 
it has been extensively quarried is.at Port Henry where the purer 
layers have been worked for flux. In the Lake Champlain region 
it is a bluish or grayish magnesian limestone occurring in layers 
from a few inches to several feet thick. 
The Chazy limestone is found in the same region as the Beekman- 
town in discontinuous areas along the eastern Adirondacks from 
Saratoga county north to the Canadian boundary. It attains its 
maximum thickness in eastern and northeastern Clinton county, 
and has been quarried around Plattsburg, Chazy and on Valcour 
island. The Chazy is the earliest representative of the Paleozoic 
formations characterized by a fairly uniform high calcium content ; 
it analyzes 95 per cent or more of calcium carbonate. It has a 
grayish color and finely crystalline texture. The fossiliferous 
beds afford attractive polished material which is sold as ““ Lepanto ” 
marble. It is used also for lime and furnace flux. There are old 
quafries on Willsboro point, Essex county. On the west side of 
the Adirondacks the Pamelia limestone described in the areal re- 
ports of that section, belong to the Chazy series. It covers a 
considerable area in Jefferson county between Leraysville and 
Clayton, and has been rather extensively quarried for building stone 
and lime, though of subordinate importance to the Trenton lime- 
stones of that section. 
In the Mohawkian or Trenton group are included the Lowville 
(Birdseye), Black River and Trenton limestones which have a wide 
distribution and collectively rank among the very important quarry 
materials of the State. They are represented in the Champlain 
valley but are specially prominent on the Vermont side; from the 
latter area a belt extends southwest across northern Washington 
county to Glens Falls in Warren county and is continued into 
Saratoga county. Another belt begins in the Mohawk valley near 
Little Falls and extends northwesterly with gradually increasing 
width across Oneida, Lewis and Jefferson counties to the St’ Law- 
rence river. There are isolated areas of Trenton limestones in the 
Hudson valley south of Albany. The limestones vary in composi- 
tion and physical character according to locality and geologic posi- 
tion. They are often highly fossiliferous. In the northern section 
they are mostly gray to nearly black in color, contain little mag- 
nesia and run as high as 97 or 98 per cent calcium carbonate. The 
lower part of the group is heavy bedded and well adapted for build- 
Sn 
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= —— 
LS 
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