-20 I- 



Poorly 

 Sorted 



1.50 



Moderately 

 Sorted 



Very Well 

 Sorted 



00 



.50 00 



1. 0mm 



1.50 20 



2.50 



30 



3.50 40 



Very Course 

 Sand 



Course 

 Sond 



4- Medium 



Sand 

 MEAN GRAIN SIZE 



+ 



Fine 

 Sand 



— |- Very Fine A 



Figure 12. Plot of Standard Deviation versus Mean Grain Size for Type A 

 Sediment Samples from 131 Cores 



30 



