BULL. GEOL. SOC. AM. 



VOL. 20, 1908, PL. 5 



Figure 1. — Shallow, narrow Trench of the Shell Rock River, in Cerro Gordo 



County, Iowa 



Showing a characteristic young Iowan stream 



Figure 2. — Elbow Lake and Part of the Moraine south of Ruthven, Iowa 

 Illustrating some characteristic topographic features of the very young Wisconsin drift. 



GLACIAL PHENOMENA IN CERRO GORDO AND PALO ALTO COUNTIES, IOWA 



