Table 4 



Sediment Grain Sizes Compiled from Samples Collected Along Barrier Section of 



South Shore of Long Island 1 



Zone 



Average d*, (mm) 



Maximum d M (mm) 



Minimum d M (mm) 



Backshore 



Dune 



0.32 



0.40 



0.25 



Berm 



0.39 



0.56 



0.25 



Average 



0.36 



0.48 



0.25 



Foreshore 



mhw 



0.38 



0.57 



0.26 



Mid-tide 



0.39 



1.30 



0.18 



mlw 



0.57 



1.70 



0.30 



Average 



0.45 



1.19 



0.25 



Offshore 



-0.6 to -1.8 m 



0.30 



0.84 



0.15 



-2.0 to -2.7 m 



no samples 



-3.0 to -3.7 m 



0.33 



0.56 



0.16 



-5.5 to -7.3 m 



0.18 



0.61 



0.12 



-9.1 to -11.9 m 



0.19 



0.85 



0.12 



-12.1 to -50 ft 



0.29 



0.79 



0.08 



Average 



0.26 



0.73 



0.13 



South shore barrier grand average 



0.36 



1.27 



1.06 



Shinnecock Inlet 2 



Throat area 



0.43 



0.77 



0.27 



Ebb delta 



0.37 



0.90 



0.21 



'Condensed from Tables 2 and 5 (Taney 1961a,b). 

 2 Afler McCormick (1971). 



McCormick (1971) conducted a detailed sampling program in the inlet and on the ebb shoal 

 for the Town of Southampton. Sediment ranged in size from 0.2 to 0.9 mm. The coarser sizes 

 were restricted to the axis of the inlet and in a zone extending westward from the mouth. The 

 sand became progressively finer offshore. Coarse sand and gravel, found in the center of the 

 inlet, appeared to be encrusted by marine growth, suggesting that it was not often mobilized. 

 Histograms showed that the most common grain size on the ebb shoal was in the band from 1.3 

 to 1.5 phi (0.41 to 0.45 mm). While the mean grain size of the flood and ebb shoals was nearly 

 the same as on the adjacent beaches, the deltas tended to have a broader distribution of sizes. 



10 



Chapter 2 Geologic Setting and Morphologic Development 



