WRIGHT COUNTY, isss. WARREN UPHAM. 



other. The former underlies the latter and contains debris which came from the 

 northeast, while the latter is abundantly supplied with Cretaceous debris and seems 

 to have come from the northwest. It is not likely that the finer part of either of 

 these tills was far transported, and is reasonably referred to the near vicinity of 

 where it is found. These two tills, in Wright county, may not be the equivalent of 

 the two which in other counties further south are separated by a soil and beds of 

 vegetation, indicating an interglacial epoch, but they may be of nearly cotemporary 

 date, the western ice-lobe having locally encroached on that from the northeast. 



N. H. w. 



