Explanation of Plate XIII. 



Fig. 1. Laminated loess in cut on the north side of M. street, east 

 of Thirteenth street, So. Omaha, Neb. This is very unlike water-lami- 

 nation. (See p. 375). 



Fig. 2. Sand-bars along tha Missouri river, opposite St. Joseph, 

 Mo. (See p. 373). Clouds of dust were being swept from these bars 

 at the time the picture was taken. 



