The sediment map of the Continental Margin Mapping Program (CONMAP) series is a compilation of grain-size data produced in the sedimentation laboratory of the Woods Hole Science Center (WHSC) of the Coastal and Marine Geology Program (CMGP) of the U.S. Geological Survey (USGS) and from both published and unpublished studies. Sediment was classified using the Wentworth (1929) grain-size scale and the Shepard (1954) scheme of sediment classification. Certain grain-size categories are combined because of the paucity of some sediment textures; blank parts of the maps indicate areas where data are insufficient to infer sediment type. Bathymetry is used as a guide in placing some of the contacts between different sediment types. However, because the true boundaries between sediment types are probably highly irregular or gradational, because the extreme textural variability that characterizes some areas does not appear at this scale, and because the accuracy of the navigational systems used during the earlier studies is limited, all contacts should be considered to be inferred.
The sediment classification for any given polygon (i.e. area) reflects the dominant surficial sediment type for that polygon. It does not mean that other sediment types are not present within the polygon, only that the dominant sediment type is the one that is most common.
U.S. Geological Survey, 200506, CONMAPSG: Continental Margin Mapping (CONMAP) sediments grainsize distribution for the United States East Coast Continental Margin: Open-File Report 2005-1001, U.S. Geological Survey, Coastal and Marine Geology Program, Woods Hole Science Center, Woods Hole, MA.This is part of the following larger work.Online Links:
- <http://pubs.usgs.gov/of/2005/1001/data/conmapsg/conmapsg.zip>
- <http://pubs.usgs.gov/of/2005/1001/htmldocs/datacatalog.htm>
Poppe, L.J., Williams, S.J., and Paskevich, V.F., 2005, U.S. Geological Survey East-Coast Sediment Analysis: Procedures, Database, and GIS Data: Open-File Report 2005-1001, U.S. Geological Survey, Coastal and Marine Geology Program, Woods Hole Science Center, Woods Hole, MA.Online Links:
This is a Vector data set. It contains the following vector data types (SDTS terminology):
Horizontal positions are specified in geographic coordinates, that is, latitude and longitude. Latitudes are given to the nearest 0.00001. Longitudes are given to the nearest 0.00001. Latitude and longitude values are specified in Decimal degrees.
The horizontal datum used is North American Datum of 1983.
The ellipsoid used is Geodetic Reference System 80.
The semi-major axis of the ellipsoid used is 6,378,137.
The flattening of the ellipsoid used is 1/298.257.
Sequential unique whole numbers that are automatically generated.
Coordinates defining the features.
| Value | Definition |
|---|---|
| br | bedrock |
| gr | gravel |
| gr-sd | gravel-sand |
| sd | sand |
| cl-st/sd | clay-silt/sand |
| sd/st/cl | sand/silt/clay |
| sd-cl/st | sand-clay/silt |
| sd-st/cl | sand-silt/clay |
| cl | clay |
Character String
| Value | Definition |
|---|---|
| 1 | bedrock |
| 2 | gravel |
| 3 | gravel-sand |
| 4 | sand |
| 5 | clay-silt/sand |
| 6 | sand-clay/silt |
| 7 | clay |
| 8 | sand-silt/clay |
| 9 | sand/silt/clay |
| Range of values | |
|---|---|
| Minimum: | 1 |
| Maximum: | 9 |
| Units: | 1 |
| Resolution: | integer count |
(508) 548-8700 x2314 (voice)
(508-) 457-2310 (FAX)
lpoppe@usgs.gov
The purpose of the CONMAPSG sediment layer is to show the sediment grain size distributions. The maps depicted in this series are old and do not accurately depict small-scale sediment distributions or sea-floor variability. This data layer is supplied primarily as a gross overview and to show general textural trends.
Poppe, L.J., Schlee, J.S., Butman, B., and Lane, C.M., 1989, Map Showing the distribution of surficial sediment, Gulf of Maine and Georges Bank: IMAP 1986-A, U.S. Geological Survey, Coastal and Marine Geology Program, Reston, VA.This is part of the following larger work.
.
Poppe, L.J., Schlee, J.S., and Knebel, H.J, 1994, Map showing distribution of surficial sediment on the mid-Atlantic continental margin, Cape Cod to Albemarle Sound: IMAP 1987-D, U.S. Geological Survey, Coastal and Marine Geology Program, Reston, VA.
Poppe, L.J., and Lane, C.M., Unpublished Material, showing distribution of surficial sediment on the mid-Atlantic continental margin and Carolina Trough, Albemarle Sound to Charleston.
Poppe, L.J., and Lane, C.M., Unpublished Material, Map showing distribution of surficial sediment on the south-Atlantic continental margin and Blake Plateau.
Person who carried out this activity:
(860) 405-9112 (voice)
kevin.joy@uconn.edu
Data sources produced in this process:
Person who carried out this activity:
(508) 548-8700 x2314 (voice)
(508) 457-2310 (FAX)
lpoppe@usgs.gov
Data sources produced in this process:
Person who carried out this activity:
(781) 544-0026 (voice)
(781) 544-3086 (FAX)
dmartin@tpmc.com
Data sources produced in this process:
Person who carried out this activity:
(508) 548-8700 x2281 (voice)
(508) 457-2310 (FAX)
vpaskevich@usgs.gov
Data sources produced in this process:
Person who carried out this activity:
(508) 548-8700 x2281 (voice)
(508) 457-2310 (FAX)
vpaskevich@usgs.gov
Data sources produced in this process:
Lawrence J. Poppe (ed.), and Polloni(ed.), Chris, 20000501, USGS East-Coast Sediment Analysis: Procedures, Database, and Georeferenced Displays: Open File Report 00-358, U.S. Geological Survey, Coastal and Marine Geology Program, Woods Hole Science Center, Woods Hole, MA.Online Links:
Poppe, L.J., Schlee, J.S., Butman, B., and Lane, C.M., 1989, Map showing distribution of surficial sediment, Gulf of Maine and Georges Banks: IMAP 1986-A, U.S. Geological Survey, Coastal and Marine Geology Program, Woods Hole Science Center, Woods Hole, MA.Online Links:
Poppe, L.J., Schlee, J.S., and Knebel, H.J., 1994, Map showing distribution of surficial sediment on the mid-Atlantic continental margin, Cape Cod to Albemarle Sound: IMAP 1987-D, U.S. Geological Survey, Coastal and Marine Geology Program, Woods Hole Science Center, Woods Hole, MA.Online Links:
The assigned sediment attributes in this data set are believed to be accurate. The sediment classification for any given polygon (i.e. area) reflects the dominant surficial sediment type for that polygon. It does not mean that other sediment types are not present within the polygon, only that the dominant sediment type is the one that is most common.
The accuracy of this dataset is based on source data that is assumed to have met National Map Accuracy Standards
This dataset covers the GLORIA project area for the United States East Coast Atlantic Ocean Exclusive Economic Zone (EEZ) area.
These data are believed to be logically consistent, although not tested. Geometry appears to be topologically clean.
Are there legal restrictions on access or use of the data?
- Access_Constraints: None
- Use_Constraints:
- 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.
(508) 548-8700 x2314 (voice)
(508) 457-2310 (FAX)
lpoppe@usgs.gov
Downloadable Data
Although this derived data set and its lineage dataset 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.Trade, firm, or product names and other references to non-USGS products and services are provided for information only and do not constitute endorsement or warranty, express or implied, by the USGS, USDOI, or U.S. Government, as to their suitability, content, usefulness, functioning, completeness, or accuracy.
| Data format: | The SHP file contains the geospatial data. The SHX file contains the index of the geospatial data. The DBF file contains the attribute data in dBASE format. The PRJ file contains the coordinate system information (optional). The AVL file contains the legend information (optional). The SBN and SBX files contain the spatial index of the geospatial data (optional). The XML file contains the metadata describing the data set <data set name>.shp.xml. An ASCII version of the metadata file. A browse graphic showing the data layer coverage and extent (optional). in format Shapefile (version ArcView 3.3) ESRI Shapefile Size: 11.982 Kbytes |
|---|---|
| Network links: |
<http://pubs.usgs.gov/of/2005/1001/data/congmapsg/conmapsg.zip> <http://pubs.usgs.gov/of/2005/1001/data/congmapsg/> |
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 data. A free data viewer, arcexplorer, capable of displaying the data is available from ESRI at www.esri.com.
(508) 548-8700 x2281 (voice)
(508) 457-2310 (FAX)
vpaskevich@usgs.gov
