94 ROCHESTER ACADEMY OF SCIENCE. [J^H- 



DEPTH. '^l!}}-9}>- FORMATION. 



o- Medina, including: 8^' 

 1158 ' *• -^ 



of Oswego sandstone. 

 5408' 



6006' 



6960' 



7097' 



7100' 



In order to show the variation of the above section from our pre- 

 vious knowledge of the thickness of these terranes, a general geolog- 

 ical section ranging through the same series of formations has been 

 compiled from books and geological articles. In the compilation of 

 this section the maximum thickness of the terranes, as near the line 

 of section as possible, has been taken. The notes following the sec- 

 tion give the authority and reference to the work in which may be 

 found the statement of the thickness of the various terranes. 



A Generalized Geological Section along the Genesee River, 



FROM the OlEAN CONGLOMERATE TO THE ArCHEAN 



OF Ontario, 

 Compiled from various books and articles. 



DEPTH. \"eSS^ FORMATION. 



o' Olean conglomerate (Little Genesee conglomerate?). 



300' (a.) Upper Devonian. 

 Wolf creek conglomerate (flat pebble). 



1800 

 2800 

 2890 

 3290 

 3340 



1 500' (?) {/>.) Chemung. 



1000' (i.) Portage. 



90' {(/.) Genesee. 



400' (e.) Hamilton. 



50' (/.) Marcellus. 



