Explanation of Plate I. 



Fig. I. Exposure of LeClaire limestone at the Sugar Creek lime quar- 

 ries, Cedar county, Iowa. The limestone is obliquely bedded in the lower 

 part of the section and horizontally bedded above. The same fauna occurs 

 in both sets of beds. Oblique beds dip southea.st. 



Fig. 2. Oblique beds of LeClaire limestone, dipping northeast, in west 

 bank of Mississippi river, one-half mile below LeClaire Iowa. 



