72 



ROCHESTER ACADEMY OF SCIENCE. 



[Jan. II, 



At Perry, si.x -\- miles NXE of Castile, two wells have been 

 drilled and from the first of these wells samples were obtained daily by 

 Professor I. P. Bishop, who kindly sent them to me for re-examination. 



Section of the Perry ^^'EI,l,. (') 



Approximate altitude 1350' A. T. (") 



DEPTH. 

 176' 



259' 

 3S0' 



560' 



620' 



775' 

 800' 



920' 



1135 



1462' 



1475' 

 1520' 



1675' 



KIND OF ROCK. 



Argillaceous and finely arenaceous shale of light 

 gray color. 



Dark gray, clear, argillaceous shale ; streak white. 



Ditto, some of the fragments with a slightly 

 brownish streak but mostly with a white streak. 



Blackish, argillaceous shale with fairly brownish 

 streak. 



Gray, argillaceous shale with white streak, non- 

 calcareous. 



Slightly darker gray argillaceous shale, non- 

 calcareous, streak white. 



Dark gray argillaceous shale with brownish-gray 

 streak, non-calcareous. 



Bluish-gray argillaceous shale, calcareous. Fos- 

 sils, especially Bryozoans. 



Cirayish, calcareous, argillaceous shale. Fossils, 

 Crinoid stems 



Bluish-gray, calcareous, argillaceous shale. Fos- 

 sils, CJwnetes, Amboco'iia umhouata (Con.) Hall. 



Very dark gray, argillaceous shale ; calcareous 

 and fossiliferous with aslightly brownish streak. 



Dark gray limestone, strong effervescence in 

 HCl. 



Ditto. 



Light gray limestone with strong effervescence. 



Dark gray limestone, which effervesces .very 

 slowly in cold HCl, and is increased on heating. 



FORMATION. 



Portage. 



Hamilton. (') 



Upper 

 Helderberg. 



Onondaga 

 Salt group. 



(i.) Prof. Bi.shop gives an interesting account of this well in the 5th Ann. Rept. State Geologist 

 [of New York] for 18S5, pp. 24, 25. 



(2.) Prof. Kishop writes me that he has been unable to secure the authentic elevation of the 

 mouth of this well; but from his knowled.^'e of the slope from Castile it is estimated to be within 10' 

 of 1350' above tide. 'J'he well is located witiiin the corporation and near the railroad station. 



(3.) The top of the Hamilton is probably higher in the well, possibly between the samples from 

 620' and 775'; but the samples are not complete enough in order to show the division between the Gen- 

 esee and Hamilton. 



