APPENDIX A 



CORE SEDIMENT DESCRIPTIONS 



Appendix A contains visual descriptions of sediment from cores in the 

 study area. Except where noted, sample locations are shown in Figure 2. 



Visual descriptions for the CERC cores are based on both megascopic and 

 microscopic examination. Sediment color is based on dry sample per Munsell 

 Soil Color Charts (Munsell Color Company, Inc., Baltimore, Maryland, 1954 

 Edition). 



Sediment names are based on the Wentworth size-scale as follows: 



Sediment 



Siz 



(» 









Phi 



Gravel 





>2 









<-l 



Very coarse sand 



1.0 



to 



2 











to -1 



Coarse sand 



0.5 



to 



1 







1 



to 0- 



Medium sand 



0.25 



to 







5 



2 



to 1- 



Fine sand 



0.125 



to 







25 



3 



to 2- 



Very fine sand 



0.0625 



to 







125 



4 



to 3- 



Silt and mud 



<0 



0625 







>4 



Sorting terms 1 













Phi 



Very well sorted 

 Well sorted 

 Moderately well so 



rted 











0.35 

 0.50 

 0.80 

 1.40 

 2.00 

 2.60 



Moderately sorted 

 Poorly sorted 

 Very poorly sorted 

 Extremely poorly s 



^rted 











'Verbal sorting terms from Friedman (1962). 



The contents of the core samples are tabulated in Table A-l. 



Table A-l. 



Description of Alpine 

 cores shown in Figure 13. 1 



Core 



No. 



Depth 

 (ft) 



Description 







Nortl 

 (watt 



l Orient Point 

 r depth 48 ft) 



1 



to 



1.0 



Black mud 





1.0 to 



2.5 



Black silty sand 





2.5 to 



4.5 



Sand, medium grain, tan 





4.5 to 



7.2 



Gravel, fine-grained, mixed 

 with about 10 pet sand 





7.2 to 



9.0 



Gravel, coarse 0.75- to 

 3-in pebbles 





9.0 





Refusal 







East 

 (wat* 



of Gull Light 

 .r depth 44 ft) 



4 



to 



0.5 



Black mud 





0.5 to 



3.5 



Sandy silt, beige color 





3.5 to 



6.0 



Silty sand, fine-grained, 

 closely packed 





6.0 





Refusal 



l From Alpine Geophysical Associates, Inc. (1965). 



57 



