Explanation of Plate II. 



Fig I. Thin-bedded LeClaire limestone overlving the phase represent- 

 ed in Plate i, Fig. 2, as seen on west side of Main street, LeClaire, Iowa 

 At this point sub-marine erosion removed portions of certain beds, and the 

 space so formed was subsequently filled with a second set of beds which 

 overlapped obliquely the eroded edges of the first. 



Fig. 2. \'iew in the Cedar VaJlev quarries, near Cedar X'allejr, Cedar 

 county, Iowa. The quarry stone belongs to the Anamosa stage, which 

 overlies the LeClaire Here we have a good illustration of the uneveness 

 of the floor upon which the Anamosa limestone was deposited; for only a 

 fourth of a mile up stream from this quarry the LeClaire beds rise to an 

 altitude of thirty feet above the level of the river, while at the quarry the 

 Anamosa beds descend fifty or sixtv feet below the same level. 



