7° 



ROCHESTER ACADEMY (JF SCIENCE. 



[Jan. 



DEPTH. "^J^ic^ 



49 

 229' 



1015' 

 1025' 



1675' 



1775' 

 1915' 



2235' 

 2335' 

 2370' 



2415 



2455' 

 2525' 



Section of Castile Well, 

 from data given by Professor Bishop and Mr. Bush. 



Approximate altitude 1390' A. T. 

 kind of rock. formation. 



49' Soil. 



Near top of Portage. 



180' "Argillaceous sandstone, 175' — 



i8o'." (■) 



^86' "Blue shale, nearly uniform in 

 color and hardness." 



10' "Flint shell {?)." 



650' " Building stone, nearly like the 

 first." 



100' " Black shale, lower part much 

 darker than the upper." 



140 

 320' 



" Corniferous limestone." 



" Alternate layers of hard and soft 

 rocks." 



, Portage. 

 Genesee. 



Hamilton. 



Marcellus. 

 Upper Helderberg. 



Lower Helderberg. 



1 9 



i 2 



45 



40' 



70' 



" Soft slate saturated with brine," 



"Salt and shale mixed." 



" Clear rock salt." 



"Shales." 



" Salt and shale, five feet of which was salt." ("') 



Bottom of well in bluish-gray marl and limestone. 

 Salt crystals. 



P 



in 



o 



(i.) In the totals for the well it is evidently called 180'. 



(2.) Mr. Bush writes that 65' of this stratum was pure rock salt. Dr. EriKelhardt slates that 

 the well " is 2,525' deep, with two salt beds, the upper forty-five feet thick, followed by forty feet 

 shale, and a lower one, which was penetrated seventy feet without passing through this rock-salt 

 vein" (Ibid., p. iq.) But on Charts 11, III and IV, accompanying this report Engelhardt has fol- 

 lowed Bishop precisely. 



(3.) In the above section it is possible to indicate only in a general way the position of the 

 different terranes. 



