Explanation of Plate XI. 



Fig. 1. The ridge b shows to the right. The talus d appears indis- 

 tinctly at its base. The Concannon house is on the basal part of the 

 ridge a, to the left. Looking west of north. (See p. 351). 



Fig. 2. The first cut along the C. G. W. Ry. southwest of Carroll, 

 Iowa, looking north. 



The topmost layer is yellow non-fossiliferous loess. The whitish 

 band is pale bluish loess with abundant fossils, iron - tubules and lime- 

 nodules. Below that is Kansan drift. (See p. 367). 



