Plate 2 



J2 



C 



1 Rochester 

 I shale 



Upper limestone 

 (Irondequoit) 



I Upper green shale 

 f (Williamson) 



j Lower limestone 



[ (Wolcott) 



I 



^ Iron ore (Furnace- 



1 ville) 



Lower green shale 

 (Sodus) 



Medina gray band 



Red Medina shales 



Gcncsce gorge, Rochester, showing the upper 

 Medina, the Clinton beds and the base of the 

 Rochester shale 



