BULL. GEOL. SOC. AM. 



VOL. 21, 1909, PL. i 



Figure 1. — Weniger I'it 

 The irregular white line is the calcareous nodular band separating the Kansan drift 



from the Aftonian below 



Figure 2. — Part of the Elliott Section 

 Darker Kansan separated from cross-bedded Aftonian by sharp, somewhat oxidized line 



SECTIONS SHOWING CONTACT OF KANSAN AND AFTONIAN 



