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U.S. Geological Survey Open-File Report 2008-1206

Coastal Change Along the Shore of Northeastern South Carolina: The South Carolina Coastal Erosion Study

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Table 3.2. Table describing three general scales of influence on the geologic evolution of the Grand Strand.

SCALE MARGIN PLATFORM COASTAL
Spatial
influence
U.S. Atlantic Margin
(thousands of kilometers)
Carolina Platform
(hundreds of kilometers)
Coastal Zone
(less than hundreds of kilometers)
Temporal
influence
Millions of years Tens to hundreds
of thousand years
Less than ten
thousand years
Geologic and
geomorphologic
influence
Margin basement structures (platforms and embayments); long-term patterns of infill and erosion Emergent-submergent events; repeated subearial and marine erosion; Pee Dee River migration; changes in sediment supply Coastal landforms and morphologies; changes in sediment supply
Dominant
processes
Tectonics - differential subsidence; global climate and sea-level changes Global climate and sea-level changes; fluvial, tidal, current, and wave energy; differential erosion Tidal, current and wave energy; differential erosion
Grand Strand
framework
characteristics
Predisposition to sediment limitation; shallow, truncated cretaceous and tertiary sedimentary rocks Pleistocene shoreline units; paleochannels and fills; erosional unconformities Holocene shoreline units; modern coastal features; erosional unconformities
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