4- 



H 



3- 



2 - 



I - 



-2 



4 



10 



Extremely Poorly 

 Sorted 



Very Poorly 

 Sorted 



Poorly Sorted 



Moderately Sorted 



Well Sorted 

 Very Well Sorted 



Figure 4. -Phi Mean Size (M^) versus Sorting {a^) plots of sediments. Data for the delta coastal beach and the Colville River 



environments were taken from Dygas et al. (1971). 



266 



