PL^ATIi VII. i;i ). — View of the iipjK-r 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 Cashaqiia and Gardean shales. 



(/j). — View oi' the (iciiescc shales of" Section 4. showing; the characteristic 

 jointage of the black shales. — Photo.graphed by A. \V. Gkab.\u, 



