PLATE VI 







s 



//TV 





O 



FIG. 1. Youthful topography in a region of slight relief. The valley of 

 Maple Creek is narrow, and much of the area is unaffected by erosion 

 Scale, about 2 miles per inch. 



A Mt. Washburne 





Upper Falls 



ij.03 T 



FIG. 2. A. young valley in a region of great relief. Scale, about 2 miles 

 per inch. 



