SYMBOLS AND DEFINITIONS 



dCmra) grain diameter expressed in millimeters 



Mj. phi mean of sample grain-size distribution (an estimate of p) 



Mdj 50th percentile phi size 



S^ phi sorting of sample grain-size distribution (an estimate of a) 



SK(j) phi skewness measure of asymmetry for a sample grain-size distri- 

 bution 



(j) a measure of sedimentary particle size 



P mean of a lognormal distribution 



o standard deviation of a lognormal distribution 



