eULL. GEOL. SOC. AM. 



VOL. 23, 1912, PL. 1 



Figure 1. — Bluffs south of Granite, Iowa 

 The lower plain is on the Dakota side, looking south 



Figure 2. — Kaxsax Knob northeast ok Canton 

 Kansan plain to the right, looking west 



RIDGES NORTHEAST OF CANTON, SOUTH DAKOTA 



