|1||Nearshore Ramp-Areas of gently seaward sloping sand and gravel with complex bedforms. Depths 0-50 meters.|
|2||Rocky Zone-Areas of high-relief outcrops with bedrock, boulders and gravel. Depths 0-90 meters.|
|3||Shelf Valley-Areas of elongate depressions with rocky walls and sand and gravel thalwegs. Depths 12-25 meters.|
|4||Outer Basin-Areas of expansive smooth seafloor with muddy, thick sediment deposits. Depths greater than 50 meters.|
|5||Ebb Tidal Delta-Areas of broad sandy platforms seaward of inlets that are lobate in plan view. Depths less than 8 meters.|
The purpose of this feature class is to qualitatively characterize the seafloor within the study area using five general physiographic zones. Geologic maps using these zones provide a regional view of the seafloor geology.
Are there legal restrictions on access or use of the data?
Use_Constraints:The intended scale of these data is 1:25,000. 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.
Neither the U.S. Government, the Department of the Interior, nor the USGS, nor any of their employees, contractors, or subcontractors, make any warranty, express or implied, nor assume any legal liability or responsibility for the accuracy, completeness, or usefulness of any information, apparatus, product, or process disclosed, nor represent that its use would not infringe on privately owned rights. 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.
|Data format:||geologic interpretations of physiographic zones in format SHP (version ArcGIS 9.2) ESRI polygon shapefile Size: 0.12|
|Media you can order:||DVD-ROM (Density 4.75 Gbytes) (format UDF)|
These data are available as a shapefile in Environmental Systems Research Institute (ESRI) format. The shapefile is distributed in a compressed format as a WinZip (ver. 9.0) To utilize these data, the user must be able to uncompress the WinZip file and have software capable of viewing ESRI shapefiles.