This data set contains a grid representing Holocene fluvial and estuarine (Qfe) sediment thickness (in meters) beneath the Massachusetts inner shelf between Nahant and northern Cape Cod Bay. These data are useful for assessing relations between geologic framework, sea-bed morphology, and sediment textural trends. Qfe is the lowermost Holocene sedimentary deposit that fills the fluvial valleys incised into the surface of Qd (undifferentiated Pleistocene glacial drift).
Are there legal restrictions on access or use of the data?
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. Additionally, there are limitations associated with eologic mapping interpretations. Because of the scale and line spacing of the source seismic profiles, not all changes in seafloor geology are captured. Horizons are inferred between seismic lines, and unit exents and thicknesses should be considered an approximation of the location of a change in geology. Further, a constant seismic velocity of 1,500 m/s was assumed for all profiles in all sediment types, which may result in inaccurate depths of stratigraphic units.
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 U.S. Geological Survey 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:||WinZip (v. 14.5) file contains an Esri Grid (and associated metadata) that defines Holocene fluvial and estuarine (Qfe) sediment thickness on the Massachusetts inner shelf between Nahant and northern Cape Cod Bay. in format AIG (version ArcGIS 9.3.1) Esri Grid Size: 0.5|
The grid contained in the ZIP file is available as an Esri binary grid. To utilize this data, the user must have a GIS software package capable of reading an Esri binary grid.