BULL. GEOL. SOC. AM 



VOL. 23, 1912, PL. 



Figure 1. — GnAVELLY Ridges northeast of Sioux Falls 



FiGuin-: 2. — T'i'1*ek Bi'ncm in west hale ov SKcnox 1 

 Township 101 north, ran.s:e 41 west 



TOPOGRAPHIC FEATURES NEAR SIOUX FALLS, SOUTH DAKOTA 



