18 



UIUI"T1.\U SAND. 

 Table VIII. Mechanical Composition of Drifting Sand from 



LeDgth of 

 diameter Id 



37 



38 



Field drilt In 

 Barnes county. 



Field drift, 

 Cooperstown. 

 Griggs county. 



39 



40 



41 



Fieid drift, 

 Steele county. 



Drifting pand, 

 Steele county. 



Drifting sand, 

 Griggs count.v. 



16—8 

 8—4 

 •4—2 

 2-1 



13.1 



55.8 

 6.4 

 1.3 



Some years ago a drift of sand was blown up in a field 

 near the city of Lindsborg in the central part of Kansas. 

 The soil in this place was composed of a sandy alluvium, 

 which held very little fine material. No specialh' note- 

 worthy feature appears in the mechanical composition of 

 this sand (Tab. X). 



The most extensive sand-hill region in the United States 

 is probablj' found in tlie western part of Nebraska. Here 

 the Avinds have been at work for a long time rearranging, 

 shifting, and sifting extensive beds, which were formed in 

 Pliocene and early Pleistocene time. Entire counties are 

 covered bv extensive rano-es of sand hills sometimes ex- 

 ceeding three hundred feet in height. The bulk of the 

 blown sand in this region largely exceeds that of any 

 other locality from which any material has been collected. 

 The lag gravels are conspicuouslj- absent in the samples 



