76 
Assembly 
ally increasing in number by the percolation of water through the calci- 
ferous slate of which the hill is composed. 
There are a few other minerals in this county, viz : 
Sulphur — Sometimes found associated with gypsum. 
Sulphate of barytes — In the bituminous limestone near Chittenango. 
Hydrate of iron, staining calcareous tufa ; called by Mr. Vanuxem, 
tufaceous iron ore. 
MONROE COUNTY. 
The mineralogical characters of this county are not unlike to those of 
the preceding. Of the argillaceous iron ore, so widely diffused through 
the western part of the State, we have here several localities. In ad- 
dition to this magnetic iron, sand has been found in considerable abun- 
dance on the shores of Lake Ontario. 
In the vicinity of Rochester small quantities of the sulphurets of lead 
and zinc have been found in the limestone. A company was once 
formed for working one of the veins, but it is needless to say that they 
soon became satisfied that the pursuit was visionary. 
Of gypsum and marl there are here several important deposits, espe- 
cially in the southern part of the county ; while calcareous tufa, is also 
abundant. All these may be advantageously employed as fertilizers 
and for other purposes. 
No county in the State is more largely supplied with sulphur springs 
than this. Indeed, it would seem that the evolution of sulphuretted 
hydrogen is in some way or other connected with the rock strata which 
characterize it. In some instances, these springs are highly charged 
with the gas. and have become places of much resort. Bathing houses, 
and houses for the accommodation of visitors, have been erected at 
many of them. The Caledonia spring, in the town of Wheatland, is 
remarkable for the large quantity of sulphuretted water which it con- 
tains. 
In Riga there are springs which give out carburetted hydrogen gas 
in such quantities as to supply a constant flame. And it may also be 
added, that several brine springs have been discovered in this county, 
but none of them are of any importance. 
To the above are to be added the following minerals, which have 
been found in Monroe county, viz : 
