BULL. GEOL. SOC. AM. 



VOL. 20, 1908, PL. 



Figure 1. — Looking almost due East 



(a) Kansan ; (6) contact line, weathered and with calcareous plates ; (c) Aftonian sand, 

 21 feet ; (d) fossiliferous Aftonian gravel, 10 feet exposed 



Figure 2. — Looking Southeast 



(a) Kansan, 13 feet; (6) contact line; (c) sand, 21 feet; (d) gravel, 14 feet exposed 



COX PIT, EAST OF MISSOURI VALLEY, IOWA 



