THE MINING AND QUARRY INDUSTRY I9I4 6l 



Falls, Amsterdam, and other places. It is a rather heavily bedded 

 stone of grayish color, suitable more especially for building pur- 

 poses. In Saratoga county the Hoyt limestone is in part the equiv- 

 alent of the Little Falls dolomite; it has been quarried for building 

 stone just west of Saratoga Springs. On the west side of the 

 Adirondacks the Theresa limestone is described by Cushing as a 

 sandy dolomite which may in part belong to the Cambric system. 

 It is comparatively thin and has no importance for quarry purposes. 



The Beekmantown limestone, whi.h is now taken as including 

 the middle and upper beds of that series as earlier defined, is mostly 

 restricted to the Champlain valley. It occurs on the New York 

 shore in rather small areas, usually down-faulted blocks, that are 

 the remnants of a once continuous belt. It is also represented 

 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 Beek- 

 mantown 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 Paleozoi : 

 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 furna e flux. There are old 

 quarries on Willsboro point, Essex county. On the west side of 

 the Adirondacks the Pamelia limestone, described in the areal re- 

 ports of that section, belongs to the Chazy series. It covers a con- 

 siderable 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 limestones 

 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 Champ- 

 lain valley but are specially prominent on the Vermont side; from 



