RELATION OF THE WISCONSIN DRIFT TO THE lOWAN 

 DRIFT AS REVEALED IN WORTH COUNTY. 



E. J. CABDE. 



This paper is the result of an attempt to determine, if possible, 

 the relation of the Wisconsin drift to the lowan drift, not only 

 along the immediate border of the Wisconsin drift, as outliaed 

 in the Iowa State Geological Survey Reports, but within the Wis- 

 consin drift plain itself. A careful and detailed investigation 

 was made along the eastern border of the Wisconsin drift from 

 the northern boundary of Worth county, where the eastern edge 

 of the Wisconsin drift enters the state, as far south as Hardin 

 county. Examination of drift cuts, well logs, and a recently 

 excavated coal shaft, located in Hardin county on the border of 

 the Wisconsin drift, failed to reveal, in any positive way, the 



presence of lowan drift beneath Wisconsin drift. Many instances 

 could be cited where unquestioned Wisconsin drift was found 

 superimposed upon, (a) Yarmouth deposits and, (b) Kansan 

 till. One of the best exposures along the Wisconsin drift border 

 showing the relation of the Wisconsin drift to the underlying 

 drift, is found along the south, bluff of Lime creek, southeast 

 quarter, section 35, and south one-half of section 36, Fertile 

 township, Worth county. Lime creek, in this particular locality, 

 is cutting on its southern bank into a high bluff of Wisconsin 

 drift and affords the follo^^ing section : 



SECTION ALONG THE SOUrH BANK OF LIME GREEK, FERTILE 

 TOWNSHIP, WORTH COUNTY. 



Feet 



Sand and gravel, largely sand near the top and more gravelly 

 near the Dase; many of the included pebbles are covered with 

 a coatins of iron oxide 



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