NORTH CAROLINA 

 Long Beach 



SOUTH CAROLINA 



ATLANTIC OCEAN 



Figure 70. Map showing locations of inner continental shelf cores 



containing pre-Holocene sediment. Numbers indicate downhole depth 



in metres to the pre-Holocene contact 



1987) ; rock fragments up to cobble size were observed on Myrtle Beach and 

 other arcuate strand beaches during visits by one of the authors in 1981 and 

 1985. 



188. Presence of pre-Holocene material near the surface of the arcuate 

 strand geomorphic zone may be partially responsible for its relative stability 

 over the long term. Semiconsolidated sands and clays would be more resistant 

 to erosion than loosely consolidated sands. FitzGerald, Hubbard, and Nummedal 

 (1978) noted that many South Carolina inlets that were not migrating rapidly 

 through time were apparently anchored in pre-Holocene sediments. Inner shelf 

 cores are not available for South Carolina south of Cape Romain. Depth to 

 pre-Holocene sediments along the cuspate delta or barrier island geomorphic 

 zones is unknown, but based on coring data in the literature (e.g. Barwis 

 1976, Hubbard and Barwis 1976), it appears deeper than in the arcuate strand 

 zone . 



Inlets 



189. Previous sections of this report have discussed the role of inlets 

 in affecting shoreline change. This fact was noted by numerous authors (e.g. 



141 



