Location and analyses of sediment samples collected by the U.S. Geological Survey in 2015 along the Delmarva Peninsula, MD and VA (Esri point shapefile and CSV file, Geographic, WGS 84)

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Frequently anticipated questions:

What does this data set describe?

Title:
Location and analyses of sediment samples collected by the U.S. Geological Survey in 2015 along the Delmarva Peninsula, MD and VA (Esri point shapefile and CSV file, Geographic, WGS 84)
Abstract:
The Delmarva Peninsula is a 220-kilometer-long headland, spit, and barrier island complex that was significantly affected by Hurricane Sandy in the fall of 2012. The U.S. Geological Survey conducted cruises during the summers of 2014 and 2015 to map the inner continental shelf of the Delmarva Peninsula using geophysical and sampling techniques to define the geologic framework that governs coastal system evolution at storm-event and longer timescales. Geophysical data collected during the cruises include swath bathymetric, sidescan sonar, chirp and boomer seismic reflection profiles, grab sample and bottom photograph data. More information about the USGS survey conducted as part of the Hurricane Sandy Response-- Geologic Framework and Coastal Vulnerability Study can be found at the project website or on the WHCMSC Field Activity Web pages: https://woodshole.er.usgs.gov/project-pages/delmarva/, https://cmgds.marine.usgs.gov/fan_info.php?fan=2014-002-FA and https://cmgds.marine.usgs.gov/fan_info.php?fan=2015-001-FA. Data collected during the 2014 survey can be obtained here: https://doi.org/10.5066/F7MW2F60
  1. How might this data set be cited?
    U.S. Geological Survey, 2016, Location and analyses of sediment samples collected by the U.S. Geological Survey in 2015 along the Delmarva Peninsula, MD and VA (Esri point shapefile and CSV file, Geographic, WGS 84): data release DOI:10.5066/F7P55KK3, U.S. Geological Survey, Coastal and Marine Geology Program, Woods Hole Coastal and Marine Science Center, Woods Hole, Massachusetts.

    Online Links:

    This is part of the following larger work.

    Sweeney, Edward M., Pendleton, Elizabeth A., Ackerman, Seth D., Andrews, Brian D., Baldwin, Wayne E., Danforth, William W., Foster, David S., Thieler, E. Robert, and Brothers, Laura L., 2016, High-resolution geophysical data collected along the Delmarva Peninsula 2015, U.S. Geological Survey Field Activity 2015-001-FA: data release DOI:10.5066/F7P55KK3, U.S. Geological Survey, Reston, VA.

    Online Links:

  2. What geographic area does the data set cover?
    West_Bounding_Coordinate: -75.874776
    East_Bounding_Coordinate: -75.223674
    North_Bounding_Coordinate: 37.753898
    South_Bounding_Coordinate: 37.011494
  3. What does it look like?
    https://cmgds.marine.usgs.gov/data/field-activity-data/2015-001-FA/data/samples/2015-001-FA_samples_browse.jpg (JPEG)
    Woods Hole Coastal and Marine Science Center 2015 sediment sample locations along the Delmarva Peninsula.
  4. Does the data set describe conditions during a particular time period?
    Beginning_Date: 14-Jul-2015
    Ending_Date: 16-Jul-2015
    Currentness_Reference:
    ground condition; sample and photo data were collected after geophysical data collection was complete.
  5. What is the general form of this data set?
    Geospatial_Data_Presentation_Form: vector and raster 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):
      • Entity point (125)
    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?
    2015-001-FA_samples
    Sample locations and texture analysis. (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.
    FIELD_NO
    Sample name or number as assigned in the field by the Chief Scientist. (Source: Modified from USGS East Coast Sediment Texture Database data dictionary) Character string.
    CRUISE_ID
    Name or number of cruise on which sample collected. Historically cruise identifiers were a combination of ship name, year of cruise and cruise leg. In more recent years, cruise identifier is a sequential serial number assigned to field activities within a specific year (in the format YYYY-XXX-FA where YYYY is the year, XXX is the cruise number within that year and FA is Field Activity). (Source: Modified from USGS East Coast Sediment Texture Database data dictionary) Character string.
    LATITUDE
    Latitude coordinate, in decimal-degrees, of sample location. South latitude recorded as negative values. (Source: Modified from USGS East Coast Sediment Texture Database data dictionary)
    Range of values
    Minimum:37.011494
    Maximum:37.753898
    Units:Decimal degrees
    Resolution:0.000001
    LONGITUDE
    Longitude coordinate, in decimal degrees, of sample location. West longitude is recorded as negative values. (Source: Modified from USGS East Coast Sediment Texture Database data dictionary)
    Range of values
    Minimum:-75.874776
    Maximum:-75.223674
    Units:Decimal degrees
    Resolution:0.000001
    DEPTH_M
    Depth in meters extracted from the NOAA U.S. coastal relief model data. (Source: Modified from USGS East Coast Sediment Texture Database data dictionary)
    Range of values
    Minimum:6.6
    Maximum:31.7
    Units:meters
    DEVICE
    Device used to collect the sample. (Source: Modified from USGS East Coast Sediment Texture Database data dictionary)
    ValueDefinition
    MINI SEABOSSsample collected with Van Veen grab sampler on the mid-size SEABOSS (Mark II configuration).
    MONTH_COLL
    Calendar month sample collected based on time in UTC. (Source: Modified from USGS East Coast Sediment Texture Database data dictionary)
    Range of values
    Minimum:7
    Maximum:7
    DAY_COLL
    Calendar day sample collected based on time in UTC. (Source: Modified from USGS East Coast Sediment Texture Database data dictionary)
    Range of values
    Minimum:14
    Maximum:16
    YEAR_COLL
    Calendar year sample collected based on time in UTC. (Source: Modified from USGS East Coast Sediment Texture Database data dictionary)
    Range of values
    Minimum:2015
    Maximum:2015
    MONTH_ANAL
    Calendar month sample analyzed. (Source: Modified from USGS East Coast Sediment Texture Database data dictionary)
    Range of values
    Minimum:2
    Maximum:9
    DAY_ANAL
    Calendar day sample analyzed. (Source: Modified from USGS East Coast Sediment Texture Database data dictionary)
    Range of values
    Minimum:1
    Maximum:22
    YEAR_ANAL
    Calendar year sample analyzed. (Source: Modified from USGS East Coast Sediment Texture Database data dictionary)
    Range of values
    Minimum:2015
    Maximum:2016
    WEIGHT
    Weight of dry sample in grams. (Source: Modified from USGS East Coast Sediment Texture Database data dictionary)
    Range of values
    Minimum:35.3636
    Maximum:211.6847
    Units:grams
    Resolution:0.0001
    GRAVEL_PCT
    Gravel content in percent dry weight of the sample (particles with nominal diameters greater than 2 mm; -1 Phi and larger). (Source: Modified from USGS East Coast Sediment Texture Database data dictionary)
    Range of values
    Minimum:0
    Maximum:76.39
    Units:percent
    Resolution:0.01
    SAND_PCT
    Sand content in percent dry weight of the sample (particles with nominal diameters less than 2 mm, but greater than or equal to 0.0625 mm; 0 Phi through 4 Phi). (Source: Modified from USGS East Coast Sediment Texture Database data dictionary)
    Range of values
    Minimum:21.50
    Maximum:99.86
    Units:percent
    Resolution:0.01
    SILT_PCT
    Silt content in percent dry weight of the sample (particles with nominal diameters less than 0.0625 mm, but greater than or equal to 0.004 mm; 5 Phi through 8 Phi, inclusive). (Source: Modified from USGS East Coast Sediment Texture Database data dictionary)
    Range of values
    Minimum:0.04
    Maximum:21.62
    Units:percent
    Resolution:0.01
    CLAY_PCT
    Clay content in percent dry weight of the sample (particles with nominal diameters less than 0.004 mm; 9 Phi and smaller). (Source: Modified from USGS East Coast Sediment Texture Database data dictionary)
    Range of values
    Minimum:0.02
    Maximum:27.21
    Units:percent
    Resolution:0.01
    CLASSIFICA
    Sediment Classification - Sediment description based on a rigorous definition, usually Shepard (1954) as modified by Schlee (1973) and Poppe et al. (2014). (Source: Modified from USGS East Coast Sediment Texture Database data dictionary)
    ValueDefinition
    CLAYEY SANDSediment whose main phase is sand, but with significant clay.
    GRAVELSediment whose main phase (equal to or greater than 50 percent) is greater than 2 mm.
    GRAVELLY SEDIMENTSediment whose phase is equal to or greater than 10 percent, but less than 50 percent gravel, but with significant other sediment.
    SANDSediment whose main phase is less than 2 mm, but greater than or equal to 0.0625 mm.
    SILTY SANDSediment whose main phase is clay, but with significant silt.
    MEDIAN
    Middle point in the grain size distribution in phi units. (Source: Modified from USGS East Coast Sediment Texture Database data dictionary)
    Range of values
    Minimum:-2.04
    Maximum:3.86
    Units:phi
    Resolution:0.01
    MEAN
    Average value in the grain size distribution in phi units. (Source: Modified from USGS East Coast Sediment Texture Database data dictionary)
    Range of values
    Minimum:-1.39
    Maximum:5.32
    Units:phi
    Resolution:0.01
    STDEV
    Standard deviation (root mean square of the deviations) of the grain size distribution in phi units (sorting). (Source: Modified from USGS East Coast Sediment Texture Database data dictionary)
    Range of values
    Minimum:0.47
    Maximum:3.40
    Units:phi
    Resolution:0.01
    PHIm5
    -5 Phi - Weight percent of the sample in the -5 Phi fraction and larger (nominal diameter of particles greater than or equal to 32 mm); very coarse pebbles, cobbles, and boulders. (Source: Modified from USGS East Coast Sediment Texture Database data dictionary)
    Range of values
    Minimum:0
    Maximum:8.62
    Units:percent
    Resolution:0.01
    PHIm4
    -4 Phi - Weight percent of the sample in the -4 Phi fraction (nominal diameter of particles greater than or equal to 16 mm, but less than 32 mm); coarse pebbles. (Source: Modified from USGS East Coast Sediment Texture Database data dictionary)
    Range of values
    Minimum:0
    Maximum:5.57
    Units:percent
    Resolution:0.01
    PHIm3
    -3 Phi - Weight percent of the sample in the -3 Phi fraction (nominal diameter of particles greater than or equal to 8 mm, but less than 16 mm); medium pebbles. (Source: Modified from USGS East Coast Sediment Texture Database data dictionary)
    Range of values
    Minimum:0
    Maximum:18.38
    Units:percent
    Resolution:0.01
    PHIm2
    -2 Phi - Weight percent of the sample in the -2 Phi fraction (nominal diameter of particles greater than or equal to 4 mm, but less than 8 mm); fine pebbles. (Source: Modified from USGS East Coast Sediment Texture Database data dictionary)
    Range of values
    Minimum:0
    Maximum:31.40
    Units:percent
    Resolution:0.01
    PHIm1
    -1 Phi - Weight percent of the sample in the -1 Phi fraction (nominal diameter of particles greater than or equal to 2 mm, but less than 4 mm); very fine pebbles (granules). (Source: Modified from USGS East Coast Sediment Texture Database data dictionary)
    Range of values
    Minimum:0
    Maximum:26.78
    Units:percent
    Resolution:0.01
    PHI_0
    0 Phi - Weight percent of the sample in the 0 Phi fraction (nominal diameters of particles greater than or equal to 1 mm, but less than 2 mm); very coarse sand. (Source: Modified from USGS East Coast Sediment Texture Database data dictionary)
    Range of values
    Minimum:0.02
    Maximum:38.24
    Units:percent
    Resolution:0.01
    PHI_1
    1 Phi - Weight percent of the sample in the 1 Phi fraction (nominal diameter of particles greater than or equal to 0.5 mm, but less than 1 mm); coarse sand. (Source: Modified from USGS East Coast Sediment Texture Database data dictionary)
    Range of values
    Minimum:0.06
    Maximum:77.85
    Units:percent
    Resolution:0.01
    PHI_2
    2 Phi - Weight percent of the sample in the 2 Phi fraction (nominal diameter of particles greater than or equal to 0.25 mm, but less than 0.5 mm); medium sand. (Source: Modified from USGS East Coast Sediment Texture Database data dictionary)
    Range of values
    Minimum:0.23
    Maximum:66.91
    Units:percent
    Resolution:0.01
    PHI_3
    3 Phi - Weight percent of the sample in the 3 Phi fraction (nominal diameter of particles greater than or equal to 0.125 mm, but less than 0.25 mm); fine sand. (Source: Modified from USGS East Coast Sediment Texture Database data dictionary)
    Range of values
    Minimum:0.06
    Maximum:83.97
    Units:percent
    Resolution:0.01
    PHI_4
    4 Phi - Weight percent of the sample in the 4 Phi fraction (nominal diameters of particles greater than or equal to 0.0625 mm, but less than 0.125 mm); very fine sand. (Source: Modified from USGS East Coast Sediment Texture Database data dictionary)
    Range of values
    Minimum:0.02
    Maximum:85.46
    Units:percent
    Resolution:0.01
    PHI_5
    5 Phi - Weight percent of the sample in the 5 Phi fraction (nominal diameter of particles greater than or equal to 0.031 mm, but less than 0.0625 mm); coarse silt. (Source: Modified from USGS East Coast Sediment Texture Database data dictionary)
    Range of values
    Minimum:0
    Maximum:5.46
    Units:percent
    Resolution:0.01
    PHI_6
    6 Phi - Weight percent of the sample in the 6 Phi fraction (nominal diameter of particles greater than or equal to 0.016 mm, but less than 0.031 mm); medium silt. (Source: Modified from USGS East Coast Sediment Texture Database data dictionary)
    Range of values
    Minimum:0.01
    Maximum:5.43
    Units:percent
    Resolution:0.01
    PHI_7
    7 Phi - Weight percent of the sample in the 7 Phi fraction (nominal diameter of particles greater than or equal to 0.008 mm, but less than 0.016 mm); fine silt. (Source: Modified from USGS East Coast Sediment Texture Database data dictionary)
    Range of values
    Minimum:0.01
    Maximum:6.99
    Units:percent
    Resolution:0.01
    PHI_8
    8 Phi - Weight percent of the sample in the 8 Phi fraction (nominal diameter of particles greater than or equal to 0.004 mm, but less than 0.008 mm); very fine silt. (Source: Modified from USGS East Coast Sediment Texture Database data dictionary)
    Range of values
    Minimum:0.01
    Maximum:9.18
    Units:percent
    Resolution:0.01
    PHI_9
    9 Phi - Weight percent of the sample in the 9 Phi fraction (nominal diameter of particles greater than or equal to 0.002 mm, but less than 0.004 mm); coarse clay. (Source: Modified from USGS East Coast Sediment Texture Database data dictionary)
    Range of values
    Minimum:0.01
    Maximum:9.81
    Units:percent
    Resolution:0.01
    PHI_10
    10 Phi - Weight percent of the sample in the 10 Phi fraction (nominal diameter of particles greater than or equal to 0.001 mm, but less than 0.002 mm); medium clay. (Source: Modified from USGS East Coast Sediment Texture Database data dictionary)
    Range of values
    Minimum:0.01
    Maximum:13.11
    Units:percent
    Resolution:0.01
    PHI_11
    11 Phi - Weight percent of the sample in the 11 Phi fraction and smaller (nominal diameter of particles less than 0.001 mm); fine clay. (Source: Modified from USGS East Coast Sediment Texture Database data dictionary)
    Range of values
    Minimum:0
    Maximum:4.29
    Units:percent
    Resolution:0.01
    PctCO3_C
    Percent of the sample carbonate that is in coarse fraction. (Source: U.S. Geological Survey)
    Range of values
    Minimum:0.23
    Maximum:99.45
    Units:percent
    Resolution:0.01
    PctCO3_CF
    Percent of the sample carbonate that is in coarse and fine fractions. (Source: U.S. Geological Survey)
    Range of values
    Minimum:0.23
    Maximum:97.66
    Units:percent
    Resolution:0.01
    Entity_and_Attribute_Overview: The CSV file has the same attributes with the same definitions.
    Entity_and_Attribute_Detail_Citation:
    USGS Open File Report 2005-1001 (https://pubs.usgs.gov/of/2005/1001/)

Who produced the data set?

  1. Who are the originators of the data set? (may include formal authors, digital compilers, and editors)
    • U.S. Geological Survey
  2. Who also contributed to the data set?
  3. To whom should users address questions about the data?
    Edward M. Sweeney
    U.S. Geological Survey
    Physical Scientist
    384 Woods Hole Road
    Woods Hole, Massachusetts
    USA

    508-548-8700 x2256 (voice)
    508-457-2310 (FAX)
    emsweeney@usgs.gov

Why was the data set created?

This data set includes the locations, identifiers, grain-size ananlysis, and carbonate concentration of the coarse fraction for surficial sediments collected at 125 stations along the Delmarva Peninsula. The sediments were collected with a modified Van Veen grab on the mid-sized SEABed Observation and Sampling System (SEABOSS, SEABOSS Mark II configuration) during USGS survey 2015-001-FA, aboard the M/V Scarlett Isabella. This data set was collected to ground-truth (verify) the acoustic data sets that were acquired early during the same survey (2015-001-FA). Bottom photographs were also taken at each station occupied by the SEABOSS (see shapefile 2015-001-FA_photos.shp in larger work citation). Samples were analyzed in the sediment laboratory at the USGS Woods Hole Coastal and Marine Science Center.

How was the data set created?

  1. From what previous works were the data drawn?
    raw hypack nav and bottom photographs (source 1 of 1)
    U.S. Geological Survey, 2016, Sediment sample locations with sediment grain size and carbonate analysis.

    Type_of_Source_Media: disc
    Source_Contribution:
    Bottom photographs and sediment samples were acquired to validate the seafloor interpretations made from geophysical data. Often sediment samplers are unable to recover large-diameter particles, so photographs can document the seafloor character in areas where samples may not be obtained. Two GoPro cameras were mounted to a USGS SEABOSS (Mark II configuration) with a modified VanVeen sampler frame. Approximate SEABOSS dimensions are 115 X 115 X 117 cm. The Van Veen sampler is housed at the bottom and center of the frame at approximately 30 X 32 X 16 cm with a 1/10 sq. meter sample capacity. Two red lasers were mounted on the frame above the sampler, 20 cm apart for scale in bottom photographs. A Keldan (Advanced Lighting Technology) light was mounted at the top of the frame and aimed downward to illuminate the seabed for photographs. Two GoPro cameras were mounted on the frame and set to capture photographs at 2 or 5 second intervals. Samples were recovered when the frame was lifted off the seabed and triggered the Van Veen sampler to close.
  2. How were the data generated, processed, and modified?
    Date: 2015 (process 1 of 6)
    One hundred and twenty-five target stations were sampled aboard the M/V Scarlett Isabella (USGS survey 2015-001-FA) with the mid-sized SEABOSS (Blackwood and Parolski, 2001) that was equipped with a Van Veen grab sampler, and 2 digital GoPro cameras. Physical sediment samples were collected at all 125 stations. Locations for sediment samples were manually recorded from the Hemisphere GPS during the retrieval of the SEABOSS instrument, at the start of instrument recovery when it was lifted from the seabed (the Van Veen sampler closed and collected a sample as it was lifted from the sea floor). Person who carried out this activity:
    U.S. Geological Survey
    Attn: Seth Ackerman
    Physical Scientist
    384 Woods Hole Rd.
    Woods Hole, MA

    508-548-8700 x2315 (voice)
    508-457-2310 (FAX)
    sackerman@usgs.gov
    Date: 2016 (process 2 of 6)
    Samples were analyzed in the sediment laboratory at the USGS Woods Hole Coastal and Marine Science Center. Coarse fraction determined by sieve; fine fraction determined by Coulter Counter. Additionally carbonate concentrations were determined through acid wash analysis on the coarse fraction. See Poppe et al. (2014) for analytical specifics for both grain size and carbonate measurement processes. Sediment statistics were recorded in MS Excel file (XLS) and saved as Comma Separated Value file (CSV). Person who carried out this activity:
    U.S. Geological Survey
    Attn: Brian Buczkowski
    Physical Scientist
    384 Woods Hole Rd.
    Woods Hole, MA

    508-548-8700 x2361 (voice)
    508-457-2310 (FAX)
    bbuczkowski@usgs.gov
    Date: 2016 (process 3 of 6)
    In ArcMap (version 10.3.1), the ASCII comma-delimited file (2015-001-FA_samples.csv) was converted to a point feature class by selecting the 'comma separated value' text file -- Create Feature Class -- from XY table using the defined geographic coordinate system (Decimal_Degrees_WGS84.prj). The point feature class layer was then exported to a shapefile using the XTools Pro (version 12.0) -- Table Restructure tool. Field types for the PHIm4 and PHIm5 attributes were manually adjusted in XTools Pro to double precision floating point values during this step, as ArcGIS automatically read these 2 attributes as integer values. Person who carried out this activity:
    U.S. Geological Survey
    Attn: Edward M. Sweeney
    Physical Scientist
    384 Woods Hole Rd.
    Woods Hole, MA

    508-548-8700 x2256 (voice)
    508-457-2310 (FAX)
    emsweeney@usgs.gov
    Date: 19-Apr-2017 (process 4 of 6)
    The online links to the data were updated to reflect the new server hosting the data. Additionally, other small edits could be made to the metadata, such as modifying http to https where appropriate. The metadata date (but not the metadata creator) was edited to reflect the date of these changes. 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: 20-Jul-2018 (process 5 of 6)
    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: 08-Sep-2020 (process 6 of 6)
    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?
    Pendleton, Elizabeth A., Ackerman, Seth D., Baldwin, Wayne E., Danforth, William W., Foster, David S., Thieler, E. Robert, and Brothers, Laura L., 2015, High-resolution geophysical data collected along the Delmarva Peninsula 2014, U.S. Geological Survey Field Activity 2014-002-FA: data release DOI:10.5066/F7MW2F60, U.S. Geological Survey, Reston, VA.

    Online Links:

    Blackwood, D., and Parolski, K., 2001, Seabed observation and sampling system: Sea Technology v. 42, no.2, p. 29-43, Compass Publications, Inc., Arlington, VA.

    Poppe, L.J., McMullen, K.Y., Williams, S.J., and Paskevich, V.F., 2014, USGS east-coast sediment analysis: Procedures, database, and GIS data: Open-File Report 2005-1001, U.S. Geological Survey, Reston, VA.

    Online Links:

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

  1. How well have the observations been checked?
    All attributes were checked in a consistent manner. The field values associated with carbonate dissolution may not add up to exactly 100 percent. However, all are within 3 percent of 100. This is due to the carbonate digestion process and the inevitable loss of material with very high carbonate concentrations.
  2. How accurate are the geographic locations?
    Differential Global Positioning System (DGPS) and Wide Area Augmentation System (WAAS) enable GPS navigation data were acquired during sediment sampling with a Hemisphere receiver and recorded with HYPACK software versions 13.0.9.21 and 15.0.9.71 (www.hypack.com). The recorded position of each bottom photograph is the position of the GPS antenna on the survey vessel acquisition van, not the SEABOSS sampler. The SEABOSS was deployed approximately 5 meters astern of the GPS antenna off the ship's A-fame on the stern of the ship. No layback or offset was applied to the recorded position. In addition to the plus or minus 5 m offset the SEABOSS may additionally drift away from the survey vessel when deployed to the seafloor. Based on the various sources of horizontal error, a conservative estimate of the horizontal accuracy of the bottom photograph location is 20-30 m.
  3. How accurate are the heights or depths?
  4. Where are the gaps in the data? What is missing?
    All 125 sampling stations retained a sample and all samples were analyzed for grain-size and carbonate concentration. A CSV file contains sediment lab analyses data used to create the sample shapefile.
  5. How consistent are the relationships among the observations, including topology?
    All samples were acquired with the same modified Van Veen Sampler mounted on a mid-sized SEABOSS (Mark II configuration). No additional checks for topological consistency were performed on this data.

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 as the originator of the dataset.
  1. Who distributes the data set? (Distributor 1 of 1)
    Edward M. Sweeney
    U.S. Geological Survey
    Physical Scientist
    384 Woods Hole Road
    Woods Hole, Massachusetts
    USA

    508-548-8700 x2256 (voice)
    508-457-2310 (FAX)
    emsweeney@usgs.gov
  2. What's the catalog number I need to order this data set? USGS data release 2015-001-FA contains sediment sample locations, grain size and carbonate concentration analyses of the seafloor samples collected from the Delmarva Peninsula area (2015-001-FA_samples.zip). The zip file contains the following shapefile: 2015-001-FA_samples.shp and a CSV files with sample analysis (2015-001-FA_samples.csv). A browse graphic (2015-001-FA_samples_browse.jpg) and Federal Geographic Data Committee (FGDC) Content Standards for Digital Geospatial Metadata (CSDGM) metadata files (2015-001-FA_samples.xml) in four standard formats are also included in the zip file.
  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 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.
  4. How can I download or order the data?
  5. What hardware or software do I need in order to use the data set?
    This zip file contains data available point shapefile and CSV format. The user must have software capable of reading shapefile or the CSV format to use these data.

Who wrote the metadata?

Dates:
Last modified: 19-Nov-2021
Metadata author:
Edward M. Sweeney
U.S. Geological Survey
Physical Scientist
384 Woods Hole Road
Woods Hole, Massachusetts
USA

508-548-8700 x2256 (voice)
508-457-2310 (FAX)
whsc_data_contact@usgs.gov
Contact_Instructions:
The metadata contact email address is a generic address in the event the metadata contact is no longer with the USGS or the email is otherwise invalid.
Metadata standard:
FGDC Content Standards for Digital Geospatial Metadata (FGDC-STD-001-1998)
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