BULL. GEOL. SOC. AM. 



VOL. 20, 1908, PL. 35 



Figure 1. — Exposure in Sertion 7, Township 85 North, Range 44 West 

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



Figure 2. — Exposure east of Logan, Iowa 



(a) Missourian limestone, 4 feet; Cb) Aftonian gravel, 2 feet; (c) Aftonian sand, 10 

 feet; (d) Kansan joint clay (Loveland), 7 feet; (e) loess, 15 feet 



SECTIONS SHOWING POSITION OF AFTONIAN 



