BULL. GEOL. SOC. AM. 



VOL. 17, 1905, PL. 52 



Figure 1. — Ridges and Valleys eroded on nearly vertical Sheets of Dwyka Tillite and Shales 



Figure 8. — A glaciated Boulder ok Barberton Sl.vi 

 ERODED VALLEYS AND RIDGES AND GLACIATED BOULDER 



