THOUSANDS OF RADIOCARBON i'EARS BEFORE PRESENT 



3 



r 



5 5 





3 2 















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- r, ' 



/ 



\ / 

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/I 



/I 1 



\ 



1 ' / 

 1 l / 



i;/ 













II 1 

 II 1 

 1 1 1 



1 ' 1 



1 ' / 

 1 1 I 



1 \ 1 



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/ 

 / 





1 1 / 



1 \ / 



1 w 



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1 1 



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 1 



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 1 





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 / 

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 / 

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Figure 10. Regional sea level versus time curve developed from South Carolina 

 data (after Colquhoun and Brooks 1986) 



near future. Rate of rise in the future is presently the subject of much 

 debate . 



Geology 



Pre-Holocene 



20. Approximately 40 percent of the State of South Carolina is coastal 

 plain (Hubbard, Hayes, and Brown 1977) of pre-Holocene age (more than 

 10,000 years BP) . The Atlantic Coastal Plain, which extends along the entire 

 east coast of the United States, is composed of sands, silts, and clays of 

 Cretaceous, Tertiary, and Quaternary age. It overlies and is bounded on the 

 west by older rocks of the Piedmont Province. The Piedmont in turn is bounded 



24 



