10 



Ttihle I. Mechanical Composition 



Length of 

 diameter in 



Chips of ehale 



from Edeemont. 



S. Dat. 



From a 



"blo«"-out, 



Bonppole, 



Ttlt 



From a 



"blow-out," 



Honppolp, T1!b 



From north of 

 Mineral, Ills. 



From rear of 



dune, Michigan 



Citv. Ind. 



.6 

 14.5 



18.6 

 16.6 

 25.7 

 20.5 

 3.3 



10.1 

 35.0 

 23.9 

 20.4 

 8.8 



29.5 



43.4 



7.2 



4.3 



14.7 



Talh II. Mechanical Composition 





11 



12 



13 



14 



IS 



Length of 



diameter in 



mm. 



Rear slope of a 



dune. 

 Alliance; Neb. 



Rear elope of a 



dune, 

 Tampico, Ills. 



Hear nlope of a 



dune, 

 ^ew Boston, Ills. 



Rear slope of a 



dune. 

 Alliance, Neb. 



Rear slope of a 



dune. 



Alliance, Neb. 



16-8 













8-4 













4 2 







9 







2-1 



9.0 1 



3.9 i 



1.8 1 



o 



■1 , 



1-1 



80.0 W^ 



43.S ■ 



22.0 I 



37.1 ta 



33.7 i 



i-t 



6.6 



28.6 W 



46.2 ■ 



50.9 ■ 



49.4 ■ 



1 1 



4 S 



5.0 



22.0 I 



26.2 r 



18.9 p 



15.0 p 



S 16 



.1 



1.7 



2.8 



1.7 1 



.1 



tV-^V 







2 







^^j-ttV 













1 1 

 ¥4 las 













TITS Sstt 













