Geology of Seneca County. 



, 103 



feet ; that it is generally thicker in the Owasco valley, one section 

 being 23 feet thick. 



For the Genesee shale the Ithaca well gives 100 feet. It 

 appears to be thicker at Lodi and Highland. 



The following is a part of the table given by Prosser for the 

 Ithaca well, quoted from Ashburner. It is in the valley one- 

 quarter mile south of the town, 396 feet, A. T. 



Depth. 



Thickness. 





340 



340 







100 



440 







30 



470 







1,142 



1,612 







82 



1,694 







78 



1,772 







13 



1,785 









115 



1,900 







1,285 



(lower) Portage shales and sandstones. 



Genesee black shale. 



Tully limestone. 



Hamilton shales and sandstones. 



Marcellus black shale. 



Corniferous limestone. 



Oriskany sandstone. 



Lower Helderberg limestones. 



Salina (not through). 



Bottom of well. 



The dip of the strata is also more steep than has been sup- 

 posed. 



instances of local disturbance and reversal of dip are frequent. 

 Examples : Seneca Falls, river, excessive to S.; Corniferous quar- 

 ries, dip in all directions ; Tully, two anticlines on Seneca lake ; 

 quarry at Willard ; Genesee, small anticline of 15 feet height in 

 railroad cut at Willard. 



A general inclination to the S. W. is commonly noticed by 

 quarry men in the east side of the county, among the sandstones. 

 The same may be assumed with probability as the cause of the 

 oblique position of the Upper Helderberg beds across level 

 country. S. G. Williams assumes it as representing the dip of 



