110 



GEOLOGY OF THE SECOND DISTRICT. 

 113. 





Perforathli of granite near Oxboic, from a drmiing hy E. E.M.'.iONS, Jr. 



Distribution of Drift and Boulders, &c. 



The facts in relation to the distribution of drift and boulders have been in part anticipated. 

 The same causes which have grooved the surface in many places so deeply, have also been 

 instrumental in the dispersion of the boulders and loose materials over ihe surface. 



In this county, as in others, boulders are found in particular sections or districts. The)'- 

 are not, as might be inferred from the remarks sometimes loosely made, spread over the 

 whole surface without regard to its level ; they are, on tiie contrary, arranged in zones, the 

 greatest number being found in tlie higher parts of certain districts. It is true, that they 

 are found ahnost every where ; but by these remarks, it is to be understood that they are far 

 more numerous in some districts than others, and that this is a result which is uniform, and 

 may be connected in each instance with one cause. 



In Jefferson, the zone of boulders, or the boulder region, is about two hundred or two hun- 

 dred and fifty feet above the level of Lake Ontario. I may err in this statement, as it regards 

 the approximate lieight ; but it is not far from the truth. Boulders are scattered over tlie 

 southern parts of the county. Upon the lake shore, granite, gneiss, hypersthene and horn- 

 blende compose the principal ones. The same kinds, also, are found between Henderson 

 and Adams, and in the vicinity of Champion and Carthage. 



But the region in which the boulders are greatly multiplied, is that upon tlie slope of tlie 

 range of hills south of Watertown, and extending in an irregular band or zone of the same 



