6oo 



SAMUEL CALVIN 



an interglacial deposit is in no way inconsistent with the earlier 

 view — and the view still entertained so far as the source of the 

 deposit is concerned — "that the loess is a- silt derived from the 

 finer materials of the Iowan drift." That a certain deposit of 

 loess was derived from the Iowan is a conviction that grows stronger 

 and stronger as the work is prosecuted farther and farther in the 



Fig. 12. — View near the southeast corner of Section 22, Township 94, Range 15, 

 showing what is probably the largest Iowan bowlder in the state; and this lies in a 

 dry pasture. 



field; and outside the paper under consideration there has never 

 been any "abandonment of the view that there is an Iowan drift 

 correlating with the loess." 



The Buchanan gravels are an interglacial deposit. They are 

 not of glacial origin, and they he between two sheets of drift. The 

 fact that they are interglacial, however, gives no adequate ground 

 to infer that they were not derived from the Kansan, or that there 

 has been an abandonment of the view that there is a Kansan 



