U.S. Geological Survey 2007 1.0 vector digital data Open-File 2005-1346 http://pubs.usgs.gov/of/2005/1346/arcgis/sf_env/SeaFloorEnv.zip Baldwin, W.E. Denny, J.F. Schwab, W.C. Gayes, P.T. Morton, R.A. Driscoll, N.W. 2007 1.0 Open-File Report 2005-1346 Woods Hole Science Center, Woods Hole, MA U.S. Geological Survey, Coastal and Marine Geology Program http://pubs.usgs.gov/of/2005/1346/ seafloorenv In 1999, the USGS, in partnership with the South Carolina Sea Grant Consortium, began a study to investigate processes affecting shoreline change along the northern coast of South Carolina, focusing on the Grand Strand region. Previous work along the U.S. Atlantic coast shows that the structure and composition of older geologic strata located seaward of the coast heavily influences the coastal behavior of areas with limited sediment supply, such as the Grand Strand. By defining this geologic framework and identifying the transport pathways and sinks of sediment, geoscientists are developing conceptual models of the present-day physical processes shaping the South Carolina coast. The primary objectives of this research effort are: 1) to provide a regional synthesis of the shallow geologic framework underlying the coastal upland, shoreface and inner continental shelf, and define its role in coastal evolution and modern beach behavior; 2) to identify and model the physical processes affecting coastal ocean circulation and sediment transport, and to define their role in shaping the modern shoreline; and 3) to identify sediment sources and transport pathways; leading to construction of a regional sediment budget. This data set contains polygon shapefile outlining the distribution of seafloor environments within the inner shelf of Long Bay. Interpretations of the sea floor environments offshore of the Grand Strand, SC, are based on textural information of surficial sediments, sidescan-sonar imagery, swath bathymetry, and seismic-reflection data. en 2007 publication date Complete None planned -79.159710 -78.515347 33.847088 33.197669 -79.159710-78.51534733.19766933.847088 General U.S. Geological Survey USGS Woods Hole Science Center WHSC Coastal and Marine Geology Program CMGP grab samples sample texture grain size sea floor environments ESRI polygon shapefile interpretive data layer ISO 19115 Topic Category oceans oceans and coastal oceans and estuaries geoscientificInformation General South Carolina Grand Strand North Myrtle Beach Myrtle Beach Surfside Garden City Pawleys Island Waites Island Southeast United States United States Atlantic Ocean None Public domain data from the U.S. Government are freely redistributable with proper metadata and source attribution. Please recognize the U.S. Geological Survey (USGS) as the source of this information. Jane Denny U.S. Geological Survey Geologist mailing and physical address

384 Woods Hole Road

Woods Hole MA 02543-1598 USA 508-548-8700 x2311 508-457-2310 jdenny@usgs.gov http://pubs.usgs.gov/of/2005/1346/images/seafloorenv.jpg Image of the distribution of seafloor environments within the inner shelf of Long Bay JPEG Microsoft Windows XP Version 5.1 (Build 2600) Service Pack 2; ESRI ArcCatalog 9.1.0.780 Shapefile These data were interpretted from sidescan-sonar, seismic-reflection and sample data at a regional scale of 1:75,000. No additional checks for topological consistency were performed on the data. These interpretations were based on sidescan-sonar, seiemic-reflection and sample data collected offshore of Myrtle Beach, SC 1999 - 2003 by the USGS and Coastal Carolina University. No additional data collection or interpretations are planned. Interpretations of the sea floor environments are derived from sidescan-sonar, swath bathymetry, seismic-reflection and sample data. The accuracy is dependent on the source data, which were navigated using Differential GPS. The sidescan-sonar data show the greatest error (~ +/- 10 m). Thus, these interpretations are assumed to be within +/- 10 m). Interpretations of the sea floor environments offshore of the Grand Strand, SC were derived from sidescan-sonar imagery, swath bathymetry, surface sediment texture, and seismic-reflection data defining the underlying geology. Polygons were hand digitized within ArcGIS 9.0. 2004 Jane Denny U.S. Geological Survey Geologist mailing and physical address

384 Woods Hole Road

Woods Hole MA 02543-1598 USA 508-548-8700 x2311 508-457-2310 jdenny@usgs.gov Vector G-polygon 7 SimplePolygonFALSE7FALSEFALSE 0.000001 0.000001 Decimal degrees D_WGS_1984 WGS_1984 6378137.000000 298.257224 GCS_WGS_1984 seafloorenv ESRI polygon shapefile ESRI Feature Class7 FID Internal feature number. ESRI Sequential unique whole numbers that are automatically generated. Shape Feature geometry. ESRI Coordinates defining the features. Name Description of sea floor environment USGS Hardground Seafloor environment USGS Inlet-Associated Shoal Seafloor environment USGS Mixed Seafloor environment USGS Shore-Detached Shoal Seafloor environment USGS String50 U.S. Geological Survey mailing and physical address

384 Woods Hole Road

Woods Hole MA 02543-1598 USA 508-548-8700 508-457-2310 Downloadable Data Although all data have been used by the USGS, no warranty, expressed or implied, is made by the USGS as to the accuracy of the data and/or related materials. The act of distribution shall not constitute any such warranty, and no responsibility is assumed by the USGS in the use of these data or related materials. Any use of trade, product, or firm names is for descriptive purposes only and does not imply endorsement by the U.S. Government. SHP ArcGIS 9.0 ESRI polygon shapefile Shapefile contains polygons outlining sea floor environments offshore of the Grand Strand, SC no compression applied 0.006 0.006 http://pubs.usgs.gov/of/2005/1346/arcgis/sf_env/SeaFloorEnv.zip Data can be downloaded via the World Wide Web (WWW) DVD-ROM 4.75 Gbytes UDF None These data are available in Environmental Systems Research Institute (ESRI) shapefile format. The user must have ArcGIS or ArcView 3.0 or greater software to read and process the data file. In lieu of ArcView or ArcGIS, the user may utilize another GIS application package capable of importing the data. A free data viewer, ArcExplorer, capable of displaying the data is available from ESRI at www.esri.com. 20070123 Jane Denny U.S. Geological Survey Geologist mailing and physical address

384 Woods Hole Road

Woods Hole MA 02543-1598 USA 508-548-8700 x2311 508-457-2310 jdenny@usgs.gov FGDC Content Standards for Digital Geospatial Metadata FGDC-STD-001-1998 local time http://www.esri.com/metadata/esriprof80.html ESRI Metadata Profile enhttp://www.esri.com/metadata/esriprof80.htmlESRI Metadata Profile Microsoft Windows XP Version 5.1 (Build 2600) Service Pack 2; ESRI ArcCatalog 9.1.0.780seafloorenv-79.15971-78.51534733.84708833.1976691-79.15971-78.51534733.84708833.1976691ISO 19115 Geographic Information - MetadataDIS_ESRI1.0dataset002file://\\JANDENDTXP\D$\Projects\SC\Publications\OFR\OFR_2005-1346\arcgis\sf_env\seafloorenv.shpLocal Area Network0.006ShapefileGCS_WGS_198472007030910494800200703091049480020070309