' CHAUTAUQUE COUNTY. 
499 
account in a few places, but no mineral wealth can be expected from any part of these coun¬ 
ties. The products of the soil are the great source of prosperity in this district, and the 
region is abundantly fertile to supply all the reasonable wants of man. 
In order to follow out the plan, and to accomplish the objects of this work, it now remains 
to trace the New-York rocks in their western continuation, to show some of the changes un¬ 
dergone throughout their immense extent, the different phases under which they are to be 
sought and recognized, and the influence of such lithological variations manifested in the 
character of the imbedded fossils. 
63 
