1892.] PROSSER THE GENESEE SECTION. 49 



The following paper was accepted for publication by the Council 

 and read by title : 



THE THICKNESS OF THE DEVONIAN AND SILURIAN 



ROCKS OF WESTERN NEW YORK ; APPROXIMATELY 



ALONG THE LINE OF THE GENESEE RIVER. 



By Charles S. Prosser. 

 contents : 



Page. 



Introductory Statement 49 



The Genesee section, a classic one for western New York : 50 



Hall's section of 1838 50 



Conrad's correlation of 3 837 51 



Hall, 1S3Q and 1S40 51 



Hall's final report of 1843 51 



Correlation of the Upper Devonian and Lower Carboniferous : 52 



Ashburner's correlation 52 



Carll's " 53 



H.S.Williams' " 54 



Records of the wells : 56 



The Clarksville well, a typical section of the Richburgh oil and natural gas field 57 



The Rock Glen well, a typical section of the Warsaw rock salt region 73 



Batavia well 88 



Rochester well gi 



General Geological section of western New York : gj 



ist. Compiled from well records 93 



2d. Compiled from books and articles g4 



Authority and reference for thickness of rocks in preceding section 95 



Conclusion 103 



Introduction. » 



The October number of the American Geologist for 1890 (') con- 

 tained an article on "the thickness of the Devonian and the Silurian 

 rocks of Western Central New York. " The present paper is a con- 

 tinuation of that general investigation, and the section crosses west- 

 ern New York somewhat west of the Genesee river. The series of 

 terranes composing this section is identical with that discussed by 

 Prof. Henry S. Williams, in his Bulletin on " The Genesee Section, 

 New York," (") together with those of the Lower Devonian and Silu- 

 rian. Many of the well sections described in this paper are near 

 localities at which Professor Williams has described outcrop sections 



(i.) op. cit.^ vol. vi, pp. 199-211. 



(2.) Bull. U. S. Geol. Surv., No. 41 : On the Fossil Faunas of the Upper Devonian — The Gene- 

 see Section, New York, 1887. 



4, Proc. Roch. Acad, of Sc, Vol. 2, May, 1892. 



