Physiographic Zones of the Sea Floor from Nahant to Northern Cape Cod Bay, Massachusetts (NAH_CCB_Pzones polygon shapefile, Geographic WGS 84)

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Frequently anticipated questions:


What does this data set describe?

Title:
Physiographic Zones of the Sea Floor from Nahant to Northern Cape Cod Bay, Massachusetts (NAH_CCB_Pzones polygon shapefile, Geographic WGS 84)
Abstract:
These data are qualitatively derived interpretive polygon shapefiles and selected source raster data defining surficial geology, sediment type and distribution, and physiographic zones of the sea floor from Nahant to Northern Cape Cod Bay. Much of the geophysical data used to create the interpretive layers were collected under a cooperative agreement among the Massachusetts Office of Coastal Zone Management (CZM), the U.S. Geological Survey (USGS), Coastal and Marine Geology Program, the National Oceanic and Atmospheric Administration (NOAA), and the U.S. Army Corps of Engineers (USACE). Initiated in 2003, the primary objective of this program is to develop regional geologic framework information for the management of coastal and marine resources. Accurate data and maps of seafloor geology are important first steps toward protecting fish habitat, delineating marine resources, and assessing environmental changes because of natural or human effects. The project is focused on the inshore waters of coastal Massachusetts. Data collected during the mapping cooperative involving the USGS have been released in a series of USGS Open-File Reports (http://woodshole.er.usgs.gov/project-pages/coastal_mass/). The interpretations released in this study are for an area extending from the southern tip of Nahant to Northern Cape Cod Bay, Massachusetts. A combination of geophysical and sample data including high resolution bathymetry and lidar, acoustic-backscatter intensity, seismic-reflection profiles, bottom photographs, and sediment samples are used to create the data interpretations. Most of the nearshore geophysical and sample data (including the bottom photographs) were collected during several cruises between 2000 and 2008. More information about the cruises and the data collected can be found at the Geologic Mapping of the Seafloor Offshore of Massachusetts Web page: http://woodshole.er.usgs.gov/project-pages/coastal_mass/.
  1. How might this data set be cited?
    Pendleton, Elizabeth, 2013, Physiographic Zones of the Sea Floor from Nahant to Northern Cape Cod Bay, Massachusetts (NAH_CCB_Pzones polygon shapefile, Geographic WGS 84): Open-File Report 2012-1157, U.S. Geological Survey, Coastal and Marine Geology Program, Woods Hole Coastal and Marine Science Center, Woods Hole, MA.

    Online Links:

    This is part of the following larger work.

    Pendleton, E.A., Baldwin, W.E., Barnhardt, W.A., Ackerman, S.D., Foster, D.S., Andrews, B.D., and Schwab, W.C., 2013, Shallow Geology, Sea-floor Texture, and Physiographic Zones of the Inner Continental Shelf from Nahant to Northern Cape Cod Bay, Massachusetts: Open-File Report 2012-1157, U.S. Geological Survey, Reston, VA.

    Online Links:

  2. What geographic area does the data set cover?
    West_Bounding_Coordinate: -71.051972
    East_Bounding_Coordinate: -70.154738
    North_Bounding_Coordinate: 42.459855
    South_Bounding_Coordinate: 41.932502
  3. What does it look like?
    https://pubs.usgs.gov/of/2012/1157/GIS_catalog/PhysiographicZones/pzones_browse.png (PNG)
    Image of the physiographic zone shapefile for the Massachusetts inner continental shelf from Nahant to Northern Cape Cod Bay
  4. Does the data set describe conditions during a particular time period?
    Beginning_Date: 01-Jan-1994
    Ending_Date: 07-May-2008
    Currentness_Reference:
    ground condition of data used to derive the interpretation
  5. What is the general form of this data set?
    Geospatial_Data_Presentation_Form: vector digital data
  6. How does the data set represent geographic features?
    1. How are geographic features stored in the data set?
      This is a Vector data set. It contains the following vector data types (SDTS terminology):
      • G-polygon (250)
    2. What coordinate system is used to represent geographic features?
      Horizontal positions are specified in geographic coordinates, that is, latitude and longitude. Latitudes are given to the nearest 0.000001. Longitudes are given to the nearest 0.000001. Latitude and longitude values are specified in Decimal degrees. The horizontal datum used is D_WGS_1984.
      The ellipsoid used is WGS_1984.
      The semi-major axis of the ellipsoid used is 6378137.000000.
      The flattening of the ellipsoid used is 1/298.257224.
  7. How does the data set describe geographic features?
    NAH_CCB_Pzones
    Physiographic zones shapefile for Nahant to northern Cape Cod Bay, MA (Source: U.S. Geological Survey)
    FID
    Internal feature number. (Source: ESRI) Sequential unique whole numbers that are automatically generated.
    Shape
    Feature geometry. (Source: ESRI) Coordinates defining the features.
    Pzone_name
    Based on geologic maps produced for the Western Gulf of Maine (Kelley and others, 1989), the seafloor within the study area can be divided into geologic environments, or physiographic zones, which are delineated based on sea-floor morphology and the dominant texture of surficial material. (Source: U.S. Geological Survey)
    ValueDefinition
    Rocky ZoneRocky Zones (RZ) are rugged areas of extreme bathymetric relief ranging from nearly vertical rock cliffs to relatively flat, gravel-covered plains littered with boulders up to 4 m in diameter.
    Nearshore BasinNearshore Basins (NB) are areas of shallow, low-relief seafloor adjacent to the mainland and separated from offshore areas by islands and shoals.
    Nearshore RampNearshore Ramps (NR) are areas of gently-sloping seafloor with generally shore-parallel bathymetric contours. This zone is primarily covered with sand-rich sediment, although small exposures of ledge, cobbles and boulders locally crop out on the seafloor.
    Shelf ValleyShelf Valleys (SV) are elongate depressions that extend offshore more or less perpendicular to the trend of the coastline, and slope gently seaward.
    Ebb Tidal DeltaEbb-tidal Deltas are lobate sandy shoals found on the seaward side of tidal inlets that form through the interaction of waves and ebbing tidal currents
    Outer BasinOuter Basins are generally found in water depths greater than 40 meters, and are finer grained, but may contain occasional rock outcrops.
    Hard-Bottom PlainsHard-bottom Plains tend to have low bathymetric relief, with a coarse sediment texture consisting of primarily gravel, sand, and rock.
    Sand WavesSand Waves are features developed by currents over the sea floor.
    Dredged ChannelDredged Channels are anthropogenic features where the sea floor has been modified to accommodate navigation.
    area_sqkm
    Area in square-kilometers of each defined polygon (Source: U.S. Geological Survey)
    Range of values
    Minimum:0.900
    Maximum:345.532
    Units:square-kilometers
    Resolution:0.001

Who produced the data set?

  1. Who are the originators of the data set? (may include formal authors, digital compilers, and editors)
    • Elizabeth Pendleton
  2. Who also contributed to the data set?
  3. To whom should users address questions about the data?
    Elizabeth A. Pendleton
    U.S. Geological Survey
    Geologist
    U.S. Geological Survey
    Woods Hole, MA
    USA

    508-548-8700 x2259 (voice)
    508-457-2310 (FAX)
    ependleton@usgs.gov

Why was the data set created?

These sea floor physiographic zones were created from geophysical and sample data collected from Nahant to Northern Cape Cod Bay, and are used to characterize the sea floor in the area. Physiographic zone maps are important data layers for marine resource managers charged with protecting fish habitat, delineating marine boundaries, and assessing environmental change due to natural or human impacts.

How was the data set created?

  1. From what previous works were the data drawn?
    Ackerman and others, 2006 (source 1 of 7)
    Ackerman, S.D., Butman, B., Barnhardt, W.A., Danforth, W.W., and Crocker, J.M., 2006, High-resolution Geologic Mapping of the Inner Continental Shelf: Boston Harbor and Approaches, Massachusetts: Open-File Report 2006-1008, U.S. Geological Survey, Reston, VA.

    Online Links:

    Type_of_Source_Media: online
    Source_Contribution:
    This report provided the source geophysical (sidescan and bathymetry) and bottom photograph data for the Boston Harbor and approaches region. These geophysical data were acquired between 2000 and 2001 by NOAA aboard the Ship Whiting and its launches. The sample data were collected in 2004 by the USGS and CZM. The NOAA cruises acquired sidescan-sonar and single-beam and multibeam bathymetric data. Sidescan data were collected with the Edgetech 272-T (100 kHz) or the Klein T-5500 (455 kHz) sonar. A hull-mounted RESON SeaBat 8101(240 kHz) was used to acquire the multibeam echosounder data. Single-beam echosounder data were acquired with an Odom Echotrac DF3200 MKII (100kHz). The USGS/CZM sampling cruise was conducted aboard the R/V Rafael using the mini SEABOSS and a VanVeen grab sampler. This report also provided a qualitative interpretation of the sidescan, bathymetry, and sample data collected in the region. These interpretive polygons were used as the initial interpretation for the Boston Harbor region. Some boundaries were slightly modified and field editing was conducted to match the classification scheme used in this study. These data also provided a good check for consistency in data interpretation.
    Andrews and others, 2010 (source 2 of 7)
    Andrews, B.D., Ackerman, S.D., Baldwin, W.E., and Barnhardt, W.A., 2010, Geophysical and Sampling Data from the Inner Continental Shelf: Northern Cape Cod Bay, Massachusetts: Open-File Report 2010-1006, U.S. Geological Survey, Reston, VA.

    Online Links:

    Type_of_Source_Media: online
    Source_Contribution:
    This report provided the source geophysical (sidescan, bathymetry, and seismic-reflection profiles) and bottom photograph data for the Northern Cape Cod Bay region. These data were acquired between 2006 and 2008 by the USGS and CZM aboard the R/V Megan T. Miller, R/V Rafael, and R/V Connecticut. Bathymetric data were acquired using a Systems Engineering & Assessment, Ltd. (SEA) SWATHplus interferometric sonar system (234 or 117 kHz). Sidescan-sonar data were collected with a Klein 3000 dual-frequency sidescan-sonar (132/445 kHz), or a SWATHplus interferometric (117-kHz). Chirp seismic data were collected using an EdgeTech Geo-Star FSSB sub-bottom profiling system and an SB-0512i towfish (FM swept frequency 0.5-12 kHz). Sediment samples and bottom photos were collected with a modified Van Veen grab sampler and SEABOSS, respectively.
    Barnhardt and others, 2010 (source 3 of 7)
    Barnhardt, W.A., Ackerman, S.D., Andrews, B.D., and Baldwin, W.E., 2010, Geophysical and Sampling Data from the Inner Continental Shelf: Duxbury to Hull, Massachusetts: Open-File Report 2009-1072, U.S. Geological Survey, Reston, VA.

    Online Links:

    Type_of_Source_Media: online
    Source_Contribution:
    This report provided the source geophysical (sidescan, bathymetry, and seismic-reflection profiles) and bottom photograph data for the Duxbury to Hull, MA region. These data were acquired between 2006 and 2007 by the USGS, CZM, and NOAA aboard the R/V Megan T. Miller, R/V Rafael, R/V Connecticut, and NOAA launches 1005 and 1014. USGS bathymetric data were acquired using a Systems Engineering & Assessment, Ltd. (SEA) SWATHplus interferometric sonar system (234 or 117 kHz). NOAA bathymetric and backscatter data were acquired with a hull-mounted RESON SeaBat 3101 and 8125. USGS sidescan-sonar data were collected with a Klein 3000 dual-frequency sidescan-sonar (132/445 kHz), or a SWATHplus interferometric (117-kHz). USGS chirp seismic data were collected using an EdgeTech Geo-Star FSSB sub-bottom profiling system and an SB-0512i towfish (FM swept frequency 0.5-12 kHz). Sediment samples and bottom photos were collected with a modified Van Veen grab sampler and SEABOSS, respectively.
    Butman and others, 2007 (source 4 of 7)
    Butman, B., Valentine, P.C., Middleton, T.J., and Danforth, W.W., 2007, A GIS Library of Multibeam Data for Massachusetts Bay and the Stellwagen Bank National Marine Sanctuary, Offshore of Boston, Massachusetts: Digital Data Series 99, U.S. Geological Survey, Reston, VA.

    Online Links:

    Type_of_Source_Media: online
    Source_Contribution:
    This report provided the source geophysical data (sidescan and bathymetry) for the western Massachusetts Bay region including Stellwagen Bank. These data were acquired between 1994 and 1998 by the USGS, Canadian Hydrographic Survey, and University of New Brunswick aboard the Frederick G. Creed. Bathymetric and backscatter data were acquired using Simrad Subsea EM 1000 Multibeam Echo Sounder.
    CZM sample database (source 5 of 7)
    Ford, K.H., Huntley, E.C., Sampson, D.W., and Voss, S., Unpublished Material, Massachusetts Sediment Database.

    Other_Citation_Details:
    This sample database has been compiled and vetted from existing samples and datasets by the Massachusetts Office of Coastal Zone Management. The data are currently unpublished, but may be acquired by contacting the CZM office: 251 Causeway St Boston, MA 02114 (617) 626-1000 czm@state.ma.us
    Type_of_Source_Media: digital vector
    Source_Contribution:
    Sediment sample databases of Ford and Voss (2010) and McMullen and others (2011) were combined then edited and supplemented with NOAA chart sampling data and over 2,000 bottom photos and descriptions at more than 400 stations by a group of GIS specialists at the Massachusetts Office of Coastal Zone Management (Emily Huntley, personal communication). These data contained sediment laboratory statistics when available, visual descriptions if sediment analysis was not performed or if the site was a bottom photograph, and classification fields of Barnhardt and others (1998), Shepard (1954), and Wentworth (1922) as well as average sediment statistics and phi size, when laboratory analysis was conducted.
    USACE- JALBTCX, 2008 (source 6 of 7)
    U.S. Army Corps of Engineers, Joint Airborne LiDAR Bathymetry Center of Expertise, 2008, Massachusetts LiDAR Grid Data in Coastal Areas: Fugro Pelagos, Inc, San Diego, CA.

    Type_of_Source_Media: disc
    Source_Contribution:
    This report provided the source lidar data for the very nearshore (< -5 m) region. Lidar (Light Detection and Ranging) data were acquired with a SHOALS-1000T (for hydrographic & topographic data) using the Joint Airborne LiDAR Bathymetry Center of Expertise (JALBTCX) lidar plane.
    Poppe and others, 2006 (source 7 of 7)
    Poppe, L.J., Paskevich, V.F., Butman, B., Ackerman, S.D., Danforth, W.W., Foster, D.S., and Blackwood, D.S., 2006, Geological Interpretation of Bathymetric and Backscatter Imagery: Open-File Report 2005-1048, U.S. Geological Survey, Reston, VA.

    Online Links:

    Type_of_Source_Media: online
    Source_Contribution:
    This report provided the source geophysical data (sidescan and bathymetry) for the Outer Cape Cod region. These data were acquired in 1998 by the USGS, Canadian Hydrographic Survey, and University of New Brunswick aboard the Frederick G. Creed. Bathymetric and backscatter data were acquired using Simrad Subsea EM 1000 Multibeam Echo Sounder.
  2. How were the data generated, processed, and modified?
    Date: 06-Feb-2009 (process 1 of 7)
    The texture and spatial distribution of sea-floor sediment were qualitatively-analyzed in ArcGIS using several input data sources (listed in the source contribution), including acoustic backscatter, bathymetry, Lidar, seismic-reflection profile interpretations, bottom photographs, and sediment samples. In order to create the interpretation, first a polygon shapefile of the study area was created (with ArcMap version 9.3.1) and merged with the published Boston Harbor interpretive polygons (Ackerman and others, 2006). The shapefile was then edited using 'cut polygon' in an edit session. The polygon cuts were done qualitatively based on slope changes in the bathymetry, backscatter intensity changes in the sidescan sonar mosaics, surficial geology interpretation based on seismic data, bottom photographs and sediment samples. The polygon editing was done at a general zoom scale of 1:12,000. Most of the sidescan data were available at 1-meter per pixel resolution, with the exception of the Butman and others (2007) data, which was at a 6-meter per pixel resolution. The bathymetric data were at a 5-meter per pixel resolution with the exception of the Butman and others (2007) data, which was at a 6-meter per pixel resolution and the Ackerman and others (2006) data, which was at a 30-meter per pixel resolution. Seismic lines were collected at approximately 100-meter spacing, with tie-lines generally spaced 1-km apart. Bottom photos are roughly 2-km apart, and the density of sediment samples varies throughout the study area, with Boston Harbor having a high density of samples, while regions classified as 'rock zones' have almost no sediment samples due to the rocky substrate. Person who carried out this activity:
    Walter A. Barnhardt
    U.S. Geological Survey
    Geologist
    U.S. Geological Survey
    Woods Hole, MA
    USA

    508-548-8700 x2355 (voice)
    508-457-2310 (FAX)
    wbarnhardt@usgs.gov
    Date: 25-Apr-2009 (process 2 of 7)
    After all the traced features were mapped, new fields were created in the shapefile called 'Pzone' and 'area_sqkm', and the sea floor was characterized for each polygon based on physiographic zones descriptions of Kelley and others (1996). Area was defined using the calculate geometry function from the attribute table using the data frame projection (UTM Zone 19N, WGS84). Person who carried out this activity:
    Walter A. Barnhardt
    U.S. Geological Survey
    Geologist
    U.S. Geological Survey
    Woods Hole, MA
    USA

    508-548-8700 x2355 (voice)
    508-457-2310 (FAX)
    wbarnhardt@usgs.gov
    Date: 05-May-2012 (process 3 of 7)
    Finally, a feature dataset was generated inside a file geodatabase (ArcCatalog version 9.3.1), and new topology rules were established to make sure that there were no overlapping polygons or accidental gaps between adjacent polygons. The topology error inspector (ArcMap version 9.3.1) was used to find topology errors and fix them. All overlapping polygon errors were fixed, and several gaps were marked as exceptions since there are several islands and significant data gaps within the study area. Overlapping polygon errors were fixed, and several gaps were marked as exceptions since there are several islands and significant data gaps within the study area. Very small (less than 1-square meter) gaps and triangular jogs in polygon boundaries within Boston Harbor exist where data published by Ackerman and others (2006) was used. These small topology feature errors were not corrected. Length and Area fields were generated automatically for all polygons in the geodatabase. The data were then exported to a shapefile and the polygons were reprojected from UTM Zone 19N, WGS84 to GCS WGS84. The length field was deleted and the area field was recalculated in the pre-existing area field. Person who carried out this activity:
    Elizabeth A. Pendleton
    U.S. Geological Survey
    Geologist
    U.S.Geological Survey
    Woods Hole, MA
    USA

    (508)-548-8700 x2259 (voice)
    (508)-457-2310 (FAX)
    ependleton@usgs.gov
    Date: 18-Nov-2015 (process 4 of 7)
    Edits to the metadata were made to fix any errors that MP v 2.9.30 flagged. This is necessary to enable the metadata to be successfully harvested for various data catalogs. In some cases, this meant adding text "Information unavailable" or "Information unavailable from original metadata" for those required fields that were left blank. Other minor edits were probably performed (title, publisher, publication place, etc.). The distribution format was modified in an attempt to be more consistent with other metadata files of the same data format. Fixed some online links. The metadata date (but not the metadata creator) was edited to reflect the date of these changes. The metadata available from a harvester may supersede metadata bundled within a download file. Compare the metadata dates to determine which metadata file is most recent. Person who carried out this activity:
    U.S. Geological Survey
    Attn: VeeAnn A. Cross
    Marine Geologist
    384 Woods Hole Rd.
    Woods Hole, MA

    508-548-8700 x2251 (voice)
    508-457-2310 (FAX)
    vatnipp@usgs.gov
    Date: 20-Jul-2018 (process 5 of 7)
    USGS Thesaurus keywords added to the keyword section. Person who carried out this activity:
    U.S. Geological Survey
    Attn: VeeAnn A. Cross
    Marine Geologist
    384 Woods Hole Road
    Woods Hole, MA

    508-548-8700 x2251 (voice)
    508-457-2310 (FAX)
    vatnipp@usgs.gov
    Date: 31-Jan-2019 (process 6 of 7)
    Fixed a broken link and added the DOI link. Person who carried out this activity:
    U.S. Geological Survey
    Attn: VeeAnn A. Cross
    Marine Geologist
    384 Woods Hole Road
    Woods Hole, MA

    508-548-8700 x2251 (voice)
    508-457-2310 (FAX)
    vatnipp@usgs.gov
    Date: 08-Sep-2020 (process 7 of 7)
    Added keywords section with USGS persistent identifier as theme keyword. Person who carried out this activity:
    U.S. Geological Survey
    Attn: VeeAnn A. Cross
    Marine Geologist
    384 Woods Hole Road
    Woods Hole, MA

    508-548-8700 x2251 (voice)
    508-457-2310 (FAX)
    vatnipp@usgs.gov
  3. What similar or related data should the user be aware of?
    Kelley, J.T., Barnhardt, W.A., Belknap, D.F., Dickson, S.M., and Kelley, A.R., 1996, The seafloor revealed: the geology of the northwestern Gulf of Maine inner continental shelf: Maine Geological Survey Open-File Report 96-6, Maine Geological Survey, Natural Resources Information and Mapping Center, Augusta, Maine.

    McMullen, K.Y, Paskevich, V.F., and Poppe, L.J., 2011, USGS East-coast Sediment Analysis: Procedures, Database, and GIS Data: Open File Report 2005-1001, U.S. Geological Survey, Reston, VA.

    Online Links:

    Ford, K.H., and Voss, S.E., 2010, Seafloor Sediment Composition in Massachusetts Determined Using Point Data: Massachusetts Division of Marine Fisheries Technical Report TR-45, Massachusetts Division of Marine Fisheries, New Bedford, MA.

    Online Links:


How reliable are the data; what problems remain in the data set?

  1. How well have the observations been checked?
  2. How accurate are the geographic locations?
    These data were produced qualitatively from acoustic and sample data with varying resolutions. Horizontal uncertainty associated with sample collection especially, can be quite high (100's of meters), much higher than positional uncertainty associated with acoustic data (usually less than <10's of meters). The date of sample collection and ship station positioning all contribute to sample position uncertainty. These qualitatively derived polygons outlining sea floor features are estimated to be within 50 meters, horizontally, but locally may be higher when sediment texture delineation is based on sample information alone.
  3. How accurate are the heights or depths?
  4. Where are the gaps in the data? What is missing?
    These physiographic zones are defined for areas where source data exist. In general, gaps in the coverage coincide with gaps in the source data. However, some small data gaps were interpreted through extrapolation.
  5. How consistent are the relationships among the observations, including topology?
    These data were drawn and vetted for accuracy using the source input rasters and point sample data described in the processing steps and source contributions. Qualitatively-defined polygons for the Boston Harbor and approaches region had already been drawn and published by Ackerman and others (2006). In their study, their region of interest was defined by using a 'convert raster to feature' function on sidescan sonar imagery within ArcGIS. This conversion task created several very small (~ 1 square-meter) triangular and rectilinear-shaped gaps along the boundaries of the defined polygons within Boston Harbor. The original Ackerman and other (2006) bottom type polygons were merged with the polygons created in this study, and polygon and field editing was done in order to make them fit the physiographic zones used in this report. However, the very small topology errors associated with the original data have not been removed, primarily because they are well below the intended scale of application of these data (1:25,000). Overlapping features and unintentional gaps within the rest of the survey area were identified using the topology checker in ArcMap (version 9.3.1) and corrected or removed.

How can someone get a copy of the data set?

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. Additionally, there are limitations associated with qualitative seafloor interpretations. Because of the scale of the source geophysical data and the spacing of samples, not all changes in sea floor texture are captured. The data were mapped between 1:8,000 and 1:25,000, but the recommended scale for application of these data is 1:25,000. Features below 5,000 m2 or less than 50 m wide were not digitized due to positional uncertainty, lack of sample information, and the often ephemeral nature of small-scale sea floor features. Not all digitized sea floor features contained sample information, so often the physiographic zone is characterized by the nearest similar feature that contains a sample. Conversely, sometimes a digitized feature contained multiple samples and not all of the samples within the feature were in agreement. In these cases the dominant sample texture was chosen to represent the primary sediment type for the polygon. Samples from rocky areas often only consist of bottom photographs, because large particle size often prevents the recovery of a sediment sample. Bottom photo classification can be subjective, such that determining the sediment type that is greater than 50% of the view frame is estimated by the interpreter and may differ among interpreters. Bottom photo transects often reveal changes in the sea floor over distances of less than 100 m and these changes are often not observable in acoustic data. Heterogeneous sea floor texture can change very quickly, and many small-scale changes will not be detectable or mappable at a scale of 1:25,000. The boundaries of polygons are often inferred based on sediment samples, and even boundaries that are traced based on amplitude changes in geophysical data are subject to migration. Polygon boundaries should be considered an approximation of the location of a change in physiographic zone.
  1. Who distributes the data set? (Distributor 1 of 1)
    Elizabeth A Pendleton
    U.S. Geological Survey
    Geologist
    U.S. Geological Survey
    Woods Hole, MA
    USA

    508-548-8700 x2259 (voice)
    508-457-2310 (FAX)
    ependleton@usgs.gov
  2. What's the catalog number I need to order this data set? Downloadable Data
  3. What legal disclaimers am I supposed to read?
    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.
  4. How can I download or order the data?
  5. What hardware or software do I need in order to use the data set?
    These data are available in Environmental Systems Research Institute (Esri) Shapefile format. The user must have software capable of importing and processing the data file.

Who wrote the metadata?

Dates:
Last modified: 17-Feb-2021
Metadata author:
Elizabeth A. Pendleton
U.S. Geological Survey
Geologist
U.S. Geological Survey
Woods Hole, MA
USA

508-548-8700 x2259 (voice)
508-457-2310 (FAX)
ependleton@usgs.gov
Metadata standard:
FGDC Content Standards for Digital Geospatial Metadata (FGDC-STD-001-1998)

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