216 



PHYSICAL GEOLOGY 



irregular. Hollows are not so deep, swells are not so high, 

 and slopes are gentler. Certain ground 'moraine drift plains 

 are almost flat. 



FIG. 226. Terminal moraine topography six miles southwest of Glen- 

 buelah, Sheboygan Co., Wis. (Alden, U.S. Geol. Surv.) 



The deposition of drift may render a surface rougher 

 than before (Fig. 228), or may reduce the relief (Fig. 229). 



FIG. 227. Terminal moraine topography near Oconomowoc, Wis. The 

 elevations are kames. (Alden, U.S. Geol. Surv.) 



