BULL. GEOL. SOC. AM. 



VOL. 20 1908, PL. 3? 



Figure 1. — A folded Aftonian Bed 

 (a) Kansan ; (6) oxidized and folded bed of Aftonian gravel; (c) Aftonian white sand 



Figure 2. — The Lovelaxd Bluff, Pottawattamie County 



(a) Sub- Aftonian, more or less folded, and the upper part with sand cemented into 

 blocks; (&) Kansan; (c) red joint clay, the Loveland ; (d) loess 



EXPOSURES SHOWING FOLDED AFTONIAN GRAVELS 



