BULL. GEOL. SOC. AM. 



VOL. 22, 1910, PL. 30 



Figure 1. — Bird^s-eye View of Mount Toby 



Figure 2.- — Hanging Valley above "a" in Figure 1 



The brook ( + ) in the center of the flgiire drains a broad, flat area, of which the high ground in 

 the center of the pictui'e forms the bacl< wall. The brook falls over the vertical wall 80 feet lower 

 than the sand plain in the foreground. 



RELIEF MAP OF MOUNT TOBY AND VIEW OF THE HANGING VALLEY INDICATED THEREON 



