62 



ROCHESTER ACADEMY OF SCIENCE. 



DEPTH, ■^■^^g 



58 



77 

 154 

 174 



193 

 212 



251 

 406 



425 

 522 



541 

 580 

 618 

 638 



657 

 676 

 792 

 830 

 846 



lOI I 



1060 



19 



77 



19 



19 



39 



^9 

 97 



19 



39 



19 



•9 

 116 



38 



16 



165 

 49 



60 



[Jan. II, 



Section of Well No. 91, Clarksvit.le, Allegany Co., New York. 



Approximate Altitude 2300' A. T. 

 ;|^" KIND OF rock. 

 58' (ireenish shale. 



Red shale (?). 



Oray sandstone. 



Bluish shale. 



Grayish-buff sandstone (?). 



Bluish-gray shale. 



Mixed shale and sandstone (?). 



Blue shale. 



Mottled shale (?). 



Grayish shale (?). 



Light gray sandstone. 



Greenish-gray shale. 



Blue shale and light gray sandstone (?). 



Olive shale. 



Light gray sandstone. 



]jluish shale. 



Mainly light gray sandstone. 



(ist sand at 770'.) 

 Bluish shale and light gray sandstone (?). 



Olive shale mixed with red iron ore. 



Mainly olive to bluish-gray shale. 



Greenish-gray sandstone (?). 



Gray sandstone. 

 (2d sand at 1060'.) 



