Table A-3. Sediment description from Nassau County cores.— Continued 



Core no. 



Water depth 



Core length 



Interval 



Description 





(feet) 



(feet) 



(feet) 





246 



-36.4 



30.2 



to 17.0 

 17.0 to 25.0 

 25.0 to 26.0 

 26.0 to 29.0 

 29.0 to 30.2 



Light gray, fine sand. 



Black clay. 



White, fine sand. 



White, fine to coarse sand with some gravel. 



White, fine to coarse sand. 



247 



-40.8 



30.0 



to 21.0 

 21.0 to 24.0 

 24.0 to 30.0 



White, fine sand. 

 No samples available. 

 Black clay. 



248 



-44.6 



30.3 



Oto 2.9 

 2.9 to 10.1 



10.1 to 10.6 



10.6 to 12.5 

 12.5 to 13.3 

 13.3 to 21.2 



21.2 to 22.2 

 22.2 to 24.7 



24.7 to 30.3 



Black sand with shells. 



White, fine sand. 



White, fine sand with large shells. 



Gray sand. 



Gray sand with shells. 



White, fine sand. 



Black clay. 



Black clay. 



Black clay. 



249 



-49.0 



28.5 



Oto 1.7 



1.7 to 14.7 



14.7 to 19.0 



19.0 to 27.5 



27.5 to 28.5 



Black and white sand, layered with shells. 



White, fine sand. 



Gray, silty, fine sand; trace of seashells. 



Gray clay ; trace of fine sand. 



Gray, silty, fine sand; trace of clay. 



250 



-48.0 



28.0 



Oto 0.4 

 0.4 to 3.4 

 3.4 to 3.9 



3.9 to 5.4 



5.4 to 18.6 



18.6 to 21.3 



21.3 to 26.3 



26.3 to 28.0 



Black, fine sand. 



Black, sandy clay. 



Brown and gray clay ; evidence of previous exposure to 



weathering above water table. 

 Black and gray clay. 

 White, fine sand. 

 Black clay. 

 Black clay. 

 Black, fine to medium sand. 



251 



-50.1 



30.0 



to 18.0 

 18.0 to 29.6 

 29.6 to 30.0 



White, fine sand. 

 Black and gray clay. 

 Black, fine to medium sand. 



252 



-51.4 



29.0 



Oto 2.6 



2.6 to 6.3 



6.3 to 16.0 



16.0 to 29.0 



White sand and seashells; black inclusions at 0.5 to 10 feet. 

 White, fine sand. 



White, fine sand with layers of shells from -8.7 to -13.7 feet. 

 Black and gray clay. 



253 



47.2 



30.0 



Oto 0.8 



0.8 to 19.5 



19.5 to 24.7 



24.7 to 28.3 



28.3 to 30.3 



Gray, fine sand with shells. 



White, fine sand; layer of shells from -5.7 to -8.8 feet. 



Black clay. 



Black, fine sand with layers of black clay; layer thicknesses vary 



from less than Vi to over 2 inches. 

 Gray clay. 



1. These cores (locations given in Figure 8) were taken along a proposed sewer outfall Une in Nassau County off Tobay 

 Beach. Descriptions were obtained from the Testing Service Corporation (1969). Visual logs of the cores are shown in 

 Figure 9C. 



99 



