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SAMUEL CALVIN 



vertical quarry face is about fourteen feet. The upper two or 

 three feet is made up of soil, reddish-brown residual clays, and 

 decayed fragmentary limestone." It will be noted that there is no 

 recognizable drift; and if the area mapped is to be used to prove 

 that there is no Iowan, with equal force, fairness, and cogency 

 certain parts along its southern margin, together with the whole 



Fig. 7. — View on north side of the road passing through the middle of Section 21, 

 Township 84, Range 18, showing the marly, fossiliferous phase of the Lime Creek 

 shales at the surface, with no overlying drift of any age. 



valley of Otter Creek southward, might be used to prove that there 

 are no glacial deposits of any sort within the whole state of Iowa. 



It would be possible to select a great many points within the 

 Iowan area, that are driftless or practically so, where Pleistocene 

 deposits are wholly absent or are represented by thin beds of sandy 

 loam or a few stray bowlders. One such begins in the eastern edge 

 of Independence and extends eastward over the stony hills for more 

 than a mile. This is part of a belt some miles in length bordering 



