i4 



DRIFTING SAND. 



Table IV. Mechanical Composition of Dune Sand from tlie Shore of Lake Michigart, 



Michigan City, Ind. 





85 



36 



37 



38 



39 



Length or 



diameter In 



mm. 



Upper rear slope 

 of dune 



Dune sand. 



Typical 

 dune sand. 



Near the crest of 

 a dune. 



From the crest 

 of a dune. 



16-8 













8-4 



•^' 1 











4-2 



4.1 



.1 









2—1 



74 1 



1.1 





12.4 1 





1-i 



14.1 1 



8.2 1 



•^L 



6.4 [ 



6.0 

 92.6 1^ 

 .6 1^ 



i-xV 



26.7 1 

 45.3 ■ 

 .5 



25.1 1^ 

 64.0 III 

 1.2 



20.7 1 



76.8 W//^ 

 1.0 



13.8 1 

 65.2 In 



1.8 



iV-irV 





.2 









1 1.^ 



32 64 

 6^ 18 S 



128 sle 















Table IV. (Continued.) 



30 





From the top 

 of a dune. 



Average. 





tr. ' 





.7 







3.4 





3.4 



5.5 





12.9 1 



17.5 



L 



73.1 ^B 



69.5 



■ 



8.7 n 



2.3 



tr. 





Tahle 5. Mechanical Composition of Drifting 

 Sand from the River Bluffs east of Cordova, III. 



Length of 

 diameter in 



16-8 



4—2 



2-1 



10.5 



1-ir 



14.0 



1-i 



25.9 



i-i 



52.2 



8 1 (i 



6.0 



tV-^V 





■5? eV 





64 12S 





i¥^ iSi> 





.4 1 



