222 NEW YORK STATE MUSEUM 



south of Hudson are known as the Burden iron mines; and, on 

 account of their extent and productiveness, and the comparative 

 insignificance of the Ulster county mines, they may be considered 

 as practically the whole of this group. The range in which the 

 Burden mines are opened is between one and two and a-half mile?? 

 east of the river, opposite Cats-kill, and is four miles in length, 

 from north to south. It lies partly in the town of Greenport and 

 partly in Livingston. The ore crops out in the western face and 

 near the crest of Plass Hill at the north, and in Cedar Hill and 

 Mount Thomas at the south. It is stratified, and its bed dips at 

 angles of 20° to 40° to the east. 



The first mining of considerable extent done on this range was 

 in 1874. 



LIME AND CEMENT. 



Lime is produced throughout the State on the outcrops of the 

 Calciferous, Trenton, Niagara and Helderberg limestonesi Some 

 of the chief localities are Glens Falls, Howe's Cave, Rochester, 

 Buffalo, Sing Sing, Pleasantville and Tuckahoe. Hydraulic 

 cement or water lime is chiefly produced from beds of hydraulic 

 limestone in the Water lime group at the base of the Lower 

 Helderberg. Rondout and Rosendale, Howe's Cave and the 

 vicinity of Syracuse are important commercially for this product. 

 At Akron and Buffalo much water lime is made, but from a lower 

 formation, probably the Salina Group. 



Portland cement is made from marl and clay at Warner's near 

 Syracuse, and at Wayland, Steuben county; from lime and clay 

 near Glens Falls and at other points. 



LIMESTONE FOR FLUX. 



In the present depressed condition of the manufacture of iron 

 in New York, the production of limestone for flux is but a small 

 industry. 



Mineral Paint • 



The mineral paint of New York state is from comparatively 

 few localities, and is manufactured from rocks of five formations: 



1 From Rossie iron ore. 



2 From Cambrian red and green slate, near Whitehall. 



