790 NEW YOEK STATE MUSEUM 



The Black river limestone rests on the Birdseye and derives its 

 name from its occurrence along the Black river. It is very thick 

 bedded, but at Watertown seems to be formed of lumpy masses. 

 Its color is black, and not over 7 feet thick, being known to 

 quarrymen as the Y-foot tier. 



The Trenton limestone is divisible into two members, viz, a 

 compact, black stone, and a gray, crystalline one. The former 

 is sometimes evenly bedded, with masses of interbedded slate; 

 while the ffrav is often more massive. The Trenton member first 

 appears as a bluff at Watertown, and southward from there forms 

 a series of terraced hills. Its total thickness is about 300 feet. 

 Its boundaries extend from Champlain northwest to the Black 

 river at a point 4 miles east of Watertown, thence to Henderson 

 and then south to EUisburg. The southern boundary passes 

 nearly northeast from Mannsville in the direction of Adams, 

 Whitesville and Tylerville. While the chief use of the different 

 Trenton members has been for building, still it would make an 

 excellent lime. It is quarried at Cape Vincent, Chaumont, Clay- 

 ton, Pamelia, Redwood, Threemile Bay, Theresa, and Watertown. 



Lewis county* 



The Trenton limestone extends across the county in a north- 

 westerly direction and follows the line of the Rome, Watertown 

 and Ogdensburg railroad. It has been quarried at several locali- 

 ties, among them Leyden, Lowville and Collinsville. 



The Birdseye member is well exposed along the road from 

 Port Leyden to Leyden, l-J miles south of the former locality on 

 the land of Peter Snyder. The rock here is a fine grained, brittle, 

 light gray stone, full of calcite eyes. An analysis of it made 

 by D. H. ISTewland gave: 



1 White, T. G. Report on relations of the Ordovician and Eo-Silurian rocks 

 in portions of Herkini'er, Oneida and Lewis counties, {see 51st an. rep't N. Y. 

 state mus. 1 : r21) 



Vanuxem, Lardner. Geol. 3d dist. N. Y, 1842. 



