PLATE VII. (a). — View of the upper end of Section 4-. The base of the section 

 is formed by the Styliolina limestone, above which are visible the gray and black 

 Genesee, and the Cashaqna and Gardeati shales. 



(/j). — View of the Genesee shales of Section 4. showing the characteristic 

 joiutage of the black shales. —Photographed by A. W. Gsabai'. 



