226 
[Assembly 
Another is near a limestone spring, by the locaUty of fibrous sulphate 
of baryta, in Carhsle, Schoharie county. 
Another is at the foot of a ledge of limestone, on the banks of Stoney 
creek, on land of David Schoonmaker, in the township of Rochester, 
Ulster county. 
These localities are all situated at or near the junction of the pyritous 
slates with the Helderberg limestone series. 
Calcareous tufa is frequently employed for making lime for stucco 
work and "hard finish ;" because in whiteness and purity, it is supe- 
rior to most other limes. 
Terrains de transport. 
The tertiary and diluvial formations are found in the valleys of all the 
streams in the district under examination ; but as it is difficult to draw 
any line of demarkation between them, in consequence of the absence 
of fossil remains, they are in this report classed under the comprehen* 
sive and significant term of terrains de transport. 
These deposits consist of stratified beds of pebbles, gravel, sand, loam 
and clay ; and by means of the transported fragments and the composi- 
tion of the clays, we can trace the direction from which these materials 
have been transported. 
The gravel and pebble beds afford fine paving stones, and the sand 
beds, materials for mortar and the brick manufacture ; but the clay beds 
are far more valuable. The clay beds in the valley of the Schoharie 
creek, have the same characters as those of the Hudson river, while 
those of the Delaware and Susquehanna are entirely different. 
Bricks are extensively manufactured in Greene and Ulster counties. 
The principal places of this manufacture are Coxsackie, Athens, Glas- 
co, Catskill, &:c. and the average aggregate number made in these two 
counties may be estimated at 20,000,000 of bricks per annum. 
The range of the main body of the tertiary clay and sand beds in 
Greene and Ulster counties, is from a few miles north of Coxsackie, by 
that village and the landing, up the Coxsackie and down Murderer's 
creeks, to Athens, thence to Catskill, and thence down the Hudson four 
or five miles, with a variable breadth, from 100 yards to two or three 
miles. Tt occurs again at Saugerties, ranges by Glasco, near which it 
J 
