



Table A-3. 



Sediment description from Nassau County cores. 



Core no. 



Water depth 



Core length 



Interval 



Description 





(feet) 



(feet) 



(feet) 





239 



+2.5 



65.0 



to 10.0 

 10.0 to 65.0 



Loose, white, fine sand with shells. 



Very dense, white, fine sand with shells and small gravel. 



240 



-18.8 



45.0 



to 12.0 

 12.0 to 44.0 

 44.0 to 45.0 



Dense, gray, fine to medium sand with shells, silt, and gravel. 

 Dense to firm, gray, fine to medium sand with sUt. 

 Firm, dark brown to gray, clayey sand; trace of gravel. 



241 



-21.9 



55.0 



to 12.0 

 12.0 to 22.0 

 22.0 to 29.0 

 29.0 to 35.0 

 35.0 to 37.0 

 37.0 to 41.5 

 41.5 to 49.0 

 49.0 to 55.0 



Firm, gray and brovm, fine to medium sand with silt and shells. 



Firm, gray, fine to coarse sand with gravel and shells. 



Firm, brown, fine to coarse sand with shell and gravel. 



Firm, gray, fine sand with silt. 



Gray, silty clay with some sand and gravel. 



Dark gray, silty clay with layers of fine sand. 



Firm, brown, fine-coarse sand; trace of small gravel. 



Very stiff, black and gray, silty clay. 



242 



-28.0 



30.3 



Oto 0.5 

 0.5 to 1.1 

 1.1 to 2.5 

 2.5 to 30.3 



Black, silty clay. 



Gray, fine-coarse sand with shells. 

 White, medium-coarse sand. 

 White, fine sand. 



243 



-31.0 



30.3 



Oto 1.5 

 1.5 to 1.8 

 1.8 to 15.2 

 15.2 to 15.6 

 15.6 to 19.8 

 19.8 to 20.2 

 20.2 to 30.3 



White, fine sand. 



White, fine sand with shells. 



White, fine sand. 



White, fine sand with shells. 



White, fine sand. 



Gray, fine sand. 



White, fine sand. 



244 



-33.4 



30.3 



Oto 7.8 

 7.8 to 11.2 



11.2 to 11.9 

 11.9 to 13.3 



13.3 to 19.7 

 19.7 to 20.1 

 20.1 to 20.5 



20.5 to 23.0 

 23.0 to 24.4 



24.4 to 26.6 



26.6 to 30.3 



Light gray to white, fine sand with shell fragments. 



White, fine sand. 



Light gray to white, fine sand with shell fragments. 



Black, clayey sill. 



Black clay. 



Black sand with some organic matter. 



Light gray, coarse to medium sand; trace of small gravel. 



Dark gray, medium sand with layers of small to large gravel. 



Brown sand and small gravel. 



Light brown, fine sand. 



White, fine sand. 



245 



-34.5 



30.3 



Oto 0.5 

 0.5 to 10.8 



10.8 to 11.0 

 11.0 to 16.0 

 16.0 to 16.6 



16.6 to 18.0 



18.0 to 21.4 



21.4 to 23.1 



23.1 to 23.9 



23.9 to 26.0 

 26.0 to 29.5 



29.5 to 29.7 



29.7 to 30.3 



Light gray, fine to medium sand with some shell fragments. 



White, fine sand. 



Light gray, fine sand with seashell fragments. 



Black, soft to stiff clay. 



Light brown, fine sand. 



White sand and gravel up to ^-inch diameter. 



Light brown to white sand with some gravel. 



Light brown, fine to medium sand; trace of gravel. 



Brown sand and small gravel. 



Light brown to white, fine sand. 



Black clay. 



Black, fine sand. 



Black clay. 



98 



