4>95 - 4>5 

 2.44 ($75 - <)25) 



Classification of sediments by kurtosis is given in Table 5. 



Table 5. Classification of sediment by kurtosis (after 

 Folk, 1964). 



Kurtosis 



Classification 



<0.67 



Very platykurtic 



0.67 to 0.90 



Platykurtic 



0.90 to 1.11 



Mesokurtic 



1.11 to 1.50 



Leptokurtic 



1.50 to 3.00 



Very leptokurtic 



>3.00 



Extremely leptokurtic 



3. Results . 



A total of 255 sediment samples was analyzed for particle-size 

 distribution, percent carbon, organic carbon, carbonate, and 

 statistical factors. Since very little, variation was noted in any of 

 the factors at any station or within the geographical boundaries of 

 the study area, surface sediments exhibited uniformity over time and 

 location. 



The percentage of sample weight for each particle size (gravel, 

 sand, silt, and clay) for each station is listed in Appendix B, and 

 for each transect in Appendix C. The percentage of sample weight of 

 total carbon, organic carbon, and carbonate for each station is listed 

 in Appendix D, and for each transect in Appendix E. 



a. Gravel . Sediments in the survey area ranged from to 7 

 percent of the total sample weight in the gravel fraction. This size 

 fraction consisted mainly of carbonate particles. Over 90 percent of 

 the stations had less than 0.51 percent of the total sample weight in 

 the gravel fraction (Fig. 10). 



The average percent of the total sample weight of this size 

 fraction at all transect stations was 0.197. Station 1, located in the 

 swash zone, had the highest average percentage of this size fraction; 

 station 4, located on the second sandbar, had the least (Table 6). The 

 weight percent of this size fraction was also low at stations A and B 

 (Table 7). 



28 



