BULL. GEOL. SOC. AM. 



VOL.23, 1911, PL. 14 







**i*- 



FiGUKE 1. — The upper Scarp and I'latform : Escarpment Station 



Figure 2. — The middle Scarp and Puatform : Ki.iabe Statihn 

 THE RIFT VALLEY 



