232 IOWA ACADEMY OF SCIENCE . 
yards. No attempt will be made in this papier to describe or even locate 
all the Nebraskan exposures observed, but the location of a few of the 
better ones may be noted. In the east bluff of the Big Sioux valley, good 
exposures occur just east of the town of Cherokee along the road in the 
northeast quarter of section 35, and in central '24. Along Mill creek 
a large exposure occurs in the east bluff- in northwest 4, Cherokee town- 
ship, and the Nebraskan-Kansan contact is exposed along the road rising 
southward to the upland in the southwest quarter of the same section. 
Another good exposure is found along a tributary of Mill creek at the 
southeast corner of section 3. The approximate location of these expo- 
sures and many others, is shown on figure 1. 
