THE IOWAN DRIFT 599 



granite of royal proportions. In some parts of the Iowan area, 

 notably in the region between the Cedar and Little Cedar east of 

 Charles City, the bowlders are distributed in trains which stretch 

 across the country from northwest to southeast without respect to 

 sloughs, while intervening spaces of essentially the same topography 

 are practically free. The fact is, however, that the bowlders may 

 be anywhere; upland or lowland seems to make no special differ- 



Fig. n. — View in Nora Springs, Iowa, showing a large and very typical Iowan 

 bowlder on dry upland, near the southeast corner of the city park. 



ence; their distribution follows no constant rule, except one: 

 typical Iowan bowlders are strictly limited to the area of the Iowan 

 drift. 



The Iowan Drift Has Certain Very Intimate Relations to Certain 



Bodies of Loess 



The discussion of the loess and of Calvin's attitude toward it, 

 on pp. 298-99 of the Berlin paper, is based on so many misappre- 

 hensions that the task of straightening out the tangle is one too 

 hopeless to be undertaken. There are bodies of loess belonging to 

 different ages, but there is one loess that stands in intimate and 

 close relation to the Iowan drift. The view that the loess is chiefly 



