THE IOWAN DRIFT 



597 



The low an drift is young as compared with the Kansan. 



The Iowan drift is not a phase (weathered or unweathered) of the 

 Kansan. 



The statement on p. 282 of the paper on ''Comparison of North 

 American and European Glacial Deposits," to the effect that the 

 Iowan bowlders "are found chiefly in shallow draws, called sloughs, 



Fig. 9. — View in Section 14, Township 95, Range 16, showing a fresh, planed 

 bowlder of the Iowan type in a dry, cultivated field. 



at the heads of the valleys or drainage lines," has no special signifi- 

 cance even if it were fully justified; but the fact is that the Iowan 

 bowlders occur in various relations to the rather featureless topog- 

 raphy of the region to which they are confined. The largest mass 

 of granite in Chickasaw County is on the highest ridge of the whole 

 region, midway between Devon and Alta Vista. There are three 

 Iowan bowlders in Floyd County especially noted for their com- 

 manding size, and each is located on dry upland. One of these 

 (Fig. 10) occurs less than two miles southwest of Charles City, in 

 the northwest quarter of Section 14, Township 95, Range 16. It 



