1892.] prosser the genesee section. 77 



Diagrammatic Section of the Kerr Well at Rock Glen, 

 New York, 



Approximate altitude 1306' A. T. 

 depth. \-(l?£?^" kind of rock. 



95' Drift ; clay and gravel. 



95' Rock, sandstone and shale. 



455' Portage. 



550' Blackish shale, top of Genesee (?). 



100' Genesee. 

 650' ? Base of Genesee. 



o 



>o Limestone at iioo'. Hamilton. 



50' Marcellus. 



1400 



1450' 



140' Upper Helderberg. 



1590' ? Base of Upper Helderberg. 



Lower Helderberg. 



1900 

 2030 

 2045 

 2085 



2135 

 2138 



Dark gray magnesian limestone at 1700'. 

 30' Crreenish and brownish-red marlytes. 

 15' ist rock salt stratum. 



p 

 o 



P 

 C/2 



40' Greenish-gray raarlyte. I p 



50' 2d rock salt stratum. 



crq 



o 



c 



Drab marlyte. 



Bottom of well. 



Since the Kerr well is located in the Warsaw salt basin the pre- 

 ceding section will serve as a standard one for the rocks of that region, 

 through which so many wells have been and will be drilled in order 

 to reach the beds of rock salt. A number of wells have been drilled 

 at this locality (') and the above section agrees fairly well with the 

 one reported by Professor Bishop, (') which is given below for the 

 purpose of comparison. 



(i.) See Ann. Rept. Supt. Onondaga Salt Springs for 1888, p. 19. 



(2.) 5th Ann. Rept. State Geologist [of New York] for 1885, p. 24. This section is copied by 

 Dr. Engelhardt, ibid.^ chart No. II. 



