| Abstract: | Several generations of the ancestral Pee Dee River system have been mapped beneath the South Carolina Grand Strand coastline and adjacent Long Bay inner shelf. Deep boreholes onshore and high-resolution seismic-reflection data offshore allow for reconstruction of these paleochannels, which formed during glacial lowstands, when the Pee Dee River system incised subaerially exposed coastal-plain and continental-shelf strata. Paleochannel groups, representing different generations of the system, decrease in age to the southwest, where the modern Pee Dee River merges with several coastal-plain tributaries at Winyah Bay, the southern terminus of Long Bay. Positions of the successive generational groups record a regional, southwestward migration of the river system that may have initiated during the late Pliocene. The migration was primarily driven by barrier-island deposition, resulting from the interaction of fluvial and shoreline processes during eustatic highstands. Structurally driven, subsurface paleotopography associated with the Mid-Carolina Platform High has also indirectly assisted in forcing this migration. These results provide a better understanding of the evolution of the region and help explain the lack of mobile sediment on the Long Bay inner shelf. Migration of the river system caused a profound change in sediment supply during the late Pleistocene. The abundant fluvial source that once fed sand-rich barrier islands was cut off and replaced with a limited source, supplied by erosion and reworking of former coastal deposits exposed at the shore and on the inner shelf. ?? 2006 Geological Society of America. |
| Genre: | Article |
| ProdID: | 70030419 |
| Citation Author: | Baldwin, W. E.; Morton, R. A.; Putney, T. R.; Katuna, M. P.; Harris, M. S.; Gayes, P. T.; Driscoll, N. W.; Denny, J. F.; Schwab, W. C. |
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| Citation End Page: | 549 |
| Citation Issue: | 5-6 |
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| Citation Language: | English |
| Citation Larger Work Title: | Bulletin of the Geological Society of America |
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| Citation Number Of Pages: | 17 |
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| Citation Search Results Text: | Migration of the Pee Dee River system inferred from ancestral paleochannels underlying the South Carolina Grand Strand and Long Bay inner shelf; 2006; Article; Journal; Bulletin of the Geological Society of America; Baldwin, W. E.; Morton, R. A.; Putney, T. R.; Katuna, M. P.; Harris, M. S.; Gayes, P. T.; Driscoll, N. W.; Denny, J. F.; Schwab, W. C. |
| Citation Start Page: | 533 |
| Citation Volume: | 118 |
| Citation Year: | 2006 |
| Type: | citation/reference |
| Text: | Migration of the Pee Dee River system inferred from ancestral paleochannels underlying the South Carolina Grand Strand and Long Bay inner shelf; 2006; Article; Journal; Bulletin of the Geological Society of America; Baldwin, W. E.; Morton, R. A.; Putney, T. R.; Katuna, M. P.; Harris, M. S.; Gayes, P. T.; Driscoll, N. W.; Denny, J. F.; Schwab, W. C. |
| URL (THUMBNAIL): | http://pubs.er.usgs.gov/thumbnails/outside_thumb.jpg |
| URL (DIGITAL OBJECT IDENTIFIER): | http://dx.doi.org/10.1130/B25856.1 |
| Date Other: | Sun, 1 Jan 2006 00:00 -0600 |
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