Metadata: Identification_Information: Citation: Citation_Information: Originator: Seth D. Ackerman Publication_Date: 20260521 Title: Locations and grain-size analysis results of sediment samples collected in May and June 2023 using the SEABOSS 2.0 in Nantucket Sound, Massachusetts, in the vicinity of Horseshoe Shoal, by the U.S. Geological Survey during field activity 2023-001-FA (point shapefile and CSV file, GCS WGS 84) Edition: 1.0 Geospatial_Data_Presentation_Form: vector and tabular digital data Series_Information: Series_Name: data release Issue_Identification: DOI:10.5066/P14NWTX8 Publication_Information: Publication_Place: Woods Hole Coastal and Marine Science Center, Woods Hole, Massachusetts Publisher: U.S. Geological Survey, Coastal and Marine Hazards and Resources Program Online_Linkage: https://doi.org/10.5066/P14NWTX8 Online_Linkage: https://www.sciencebase.gov/catalog/item/68badfebd4be0209bab077e0 Larger_Work_Citation: Citation_Information: Originator: Brian D. Andrews Originator: Wayne E. Baldwin Originator: Seth D. Ackerman Originator: Charles R. Worley Originator: Eric M. Moore Originator: Alex R. Nichols Originator: Patrick J. Berube Originator: Emily C. Huntley Originator: Laura L. Brothers Publication_Date: 2026 Title: High-resolution geophysical and sampling data collected in Nantucket Sound Massachusetts in the vicinity of Horseshoe Shoal, during USGS Field Activity 2023-001-FA Edition: 1.0 Series_Information: Series_Name: data release Issue_Identification: DOI:10.5066/P14NWTX8 Publication_Information: Publication_Place: Reston, VA Publisher: U.S. Geological Survey Other_Citation_Details: Suggested citation: Andrews, B.D., Baldwin, W.E., Ackerman, S.D., Worley, C.R., Moore, E.M., Nichols, A.R., Berube, P.J., Huntley, E.C., and Brothers, L.L., 2026, High-resolution geophysical and sampling data collected in Nantucket Sound Massachusetts in the vicinity of Horseshoe Shoal, during USGS Field Activity 2023-001-FA: U.S. Geological Survey data release, https://doi.org/10.5066/P14NWTX8 Online_Linkage: https://doi.org/10.5066/P14NWTX8 Online_Linkage: https://www.sciencebase.gov/catalog/item/68adc403d4be027f635b3f90 Description: Abstract: In May and June 2023, the U.S. Geological Survey, in collaboration with the Massachusetts Office of Coastal Zone Management, collected high-resolution geophysical and seafloor sampling data, in Nantucket Sound to understand the regional geology in the vicinity of Horseshoe Shoal. Geophysical data collected include swath bathymetry, backscatter, and seismic reflection profile data. Ground-truth data, including sediment samples, underwater video, and bottom photographs were also collected. This effort is part of a long-term collaboration between the USGS and the Commonwealth of Massachusetts to map the State’s waters. In addition to resolving coastal hazards, habitats and resources, these data can be used to better understand the Quaternary history of coastal Massachusetts including the influence of sea-level change and sediment supply on coastal evolution. This collaboration produces high-resolution geologic data that serve the needs of research, management, and the public. Data collected as part of this mapping cooperative continue to be released in a series of USGS Reports and Data Releases https://www.usgs.gov/centers/whcmsc/science/geologic-mapping-massachusetts-seafloor Purpose: These data were collected to characterize the sea floor by identifying sediment texture and to ground-truth acoustic data collected during the both 2022-001-FA, and 2023-001-FA. This dataset contains the locations and grain-size analysis results of surficial sediments collected with a modified Van Veen grab sampler on the SEABed Observation and Sampling System (SEABOSS 2.0). Fifty-nine sediment samples were acquired at 60 sampling locations covering both the 2022-001-FA, and 2023-001-FA survey areas in Nantucket Sound. The SEABOSS 2.0 is equipped with a FLIR Blackfly S BFS-PGE-50S5M-C camera, a DeepSea Power & Light HD Multi SeaCam video camera and a modified Van Veen grab sampler and was deployed from the Research Vessel (R/V) Rafael during USGS field activity 2023-001-FA (May 12 and June 13-14, 2023). These data were collected to characterize the sea floor by identifying sediment texture and to ground-truth acoustic data collected during the field activity. The sediments were analyzed using the Horiba laser diffraction unit (LA-960) and sieving of the ≥ -2 phi fraction. Supplemental_Information: See the larger work citation to view the sea-floor videos, locations of bottom video tracklines, locations and grain-size analysis results of sediment samples, and geophysical survey data collected during the field activity. Support for field activity 2023-001-FA was provided to the USGS by the Massachusetts Office of Coastal Zone Management. For more information on the field activities associated with this project, see https://cmgds.marine.usgs.gov/fan_info.php?fan=2022-001-FA and https://cmgds.marine.usgs.gov/fan_info.php?fan=2023-001-FA Time_Period_of_Content: Time_Period_Information: Range_of_Dates/Times: Beginning_Date: 20230512 Ending_Date: 20230614 Currentness_Reference: Data were collected on the following dates: 20230512, 20230613, and 20230614. Status: Progress: Complete Maintenance_and_Update_Frequency: None planned Spatial_Domain: Bounding_Coordinates: West_Bounding_Coordinate: -70.47943085 East_Bounding_Coordinate: -70.29029622 North_Bounding_Coordinate: 41.57544647 South_Bounding_Coordinate: 41.50332379 Keywords: Theme: Theme_Keyword_Thesaurus: None Theme_Keyword: U.S. Geological Survey Theme_Keyword: USGS Theme_Keyword: Coastal and Marine Hazards and Resources Program Theme_Keyword: CMHRP Theme_Keyword: Woods Hole Coastal and Marine Science Center Theme_Keyword: WHCMSC Theme_Keyword: Department of the Interior Theme_Keyword: DOI Theme_Keyword: Massachusetts Office of Coastal Zone Management Theme_Keyword: MassCZM Theme_Keyword: MA CZM Theme_Keyword: CZM Theme_Keyword: ground-truth Theme_Keyword: seafloor samples Theme_Keyword: sediment samples Theme_Keyword: sediment data Theme_Keyword: surficial sediment classification Theme_Keyword: stations Theme_Keyword: seafloor Theme_Keyword: sea floor Theme_Keyword: sediments Theme_Keyword: SEABOSS Theme_Keyword: SEABed Observation and Sampling System Theme_Keyword: Horiba Theme_Keyword: laser diffraction Theme_Keyword: shapefile Theme_Keyword: gravel Theme_Keyword: sand Theme_Keyword: silt Theme_Keyword: clay Theme_Keyword: shapefile Theme_Keyword: CSV Theme_Keyword: field activity number 2023-001-FA Theme_Keyword: R/V Rafael Theme: Theme_Keyword_Thesaurus: USGS Thesaurus Theme_Keyword: grab sampling Theme_Keyword: grain-size analysis Theme_Keyword: marine geology Theme_Keyword: sea-floor characteristics Theme_Keyword: unconsolidated deposits Theme: Theme_Keyword_Thesaurus: ISO 19115 Topic Category Theme_Keyword: oceans Theme_Keyword: geoscientificInformation Theme_Keyword: location Theme: Theme_Keyword_Thesaurus: USGS Metadata Identifier Theme_Keyword: USGS:68badfebd4be0209bab077e0 Place: Place_Keyword_Thesaurus: None Place_Keyword: North America Place_Keyword: United States of America Place_Keyword: Atlantic Ocean Place_Keyword: Massachusetts Place_Keyword: Nantucket Sound Place_Keyword: Horseshoe Shoal Place_Keyword: Eldridge Shoal Place_Keyword: Succonnesset Shoal Place_Keyword: Wreck Shoal Stratum: Stratum_Keyword_Thesaurus: None Stratum_Keyword: sea floor Stratum_Keyword: seafloor Stratum_Keyword: seabed Temporal: Temporal_Keyword_Thesaurus: None Temporal_Keyword: 2023 Access_Constraints: No access constraints. Please see 'Distribution Information' for details. Use_Constraints: These data are marked with a Creative Commons CC0 1.0 Universal License. These data are in the public domain and do not have any use constraints. Users are advised to read the dataset's metadata thoroughly to understand appropriate use and data limitations. Point_of_Contact: Contact_Information: Contact_Person_Primary: Contact_Person: Seth Ackerman Contact_Organization: U.S. Geological Survey Contact_Position: Geologist Contact_Address: Address_Type: mailing and physical address Address: 384 Woods Hole Rd. City: Woods Hole State_or_Province: MA Postal_Code: 02543-1598 Country: USA Contact_Voice_Telephone: 508-548-8700 x2315 Contact_Facsimile_Telephone: 508-457-2310 Contact_Electronic_Mail_Address: sackerman@usgs.gov Browse_Graphic: Browse_Graphic_File_Name: https://www.sciencebase.gov/catalog/file/get/68badfebd4be0209bab077e0?name=2023-001-FA_samples_browse.jpg Browse_Graphic_File_Description: Thumbnail image of the sediment sample locations in the survey area in Nantucket Sound, Massachusetts. Browse_Graphic_File_Type: JPEG Cross_Reference: Citation_Information: Originator: F.P. Shepard Publication_Date: 1954 Title: Nomenclature based on sand-silt-clay ratios Series_Information: Series_Name: Journal of Sedimentary Petrology Issue_Identification: v. 24, no. 3., p. 151-158 Cross_Reference: Citation_Information: Originator: J.S. Schlee Originator: J. Webster Publication_Date: 1967 Title: A computer program for grain-size data Series_Information: Series_Name: Sedimentology Issue_Identification: v. 8, no. 1., p. 45-53 Cross_Reference: Citation_Information: Originator: J.S. Schlee Publication_Date: 1973 Title: Atlantic continental shelf and slope of the United States-sediment texture of the northeastern part Series_Information: Series_Name: Professional Paper Issue_Identification: 529-L Publication_Information: Publication_Place: Reston, VA Publisher: U.S. Geological Survey Online_Linkage: https://doi.org/10.3133/pp529L Cross_Reference: Citation_Information: Originator: L.J. Poppe Originator: K.Y. McMullen Originator: S.J. Williams Originator: V.F. Paskevich Publication_Date: 2014 Title: USGS east-coast sediment analysis: Procedures, database, and GIS data Edition: 3.0 Series_Information: Series_Name: Open-File Report Issue_Identification: 2005-1001 Publication_Information: Publication_Place: Reston, VA Publisher: U.S. Geological Survey Online_Linkage: https://pubs.usgs.gov/of/2005/1001/ Data_Quality_Information: Logical_Consistency_Report: These data were checked but no modifications or corrections have been made to the file. Completeness_Report: This dataset includes a Comma Separated Values (CSV) file and a shapefile of the locations and grain-size analysis results of the sediment samples collected during field activity 2023-001-FA. The shapefile contains a subset of the grain-size analysis results, so users should access the CSV file for the full sediment grain-size analysis results. Physical sediment samples were collected at 59 of the 60 sites occupied during field activity 2023-001-FA; there was no sample collected at site 2023-001-006. Positional_Accuracy: Horizontal_Positional_Accuracy: Horizontal_Positional_Accuracy_Report: The seafloor survey was conducted with the SEABOSS 2.0 system, and the sampling site locations were recorded . This was done by populating the metadata of each image with coordinate data from the vessel's navigation system. The estimated horizontal positional accuracy of the bottom image locations is approximately 5 meters. This is a conservative estimate that accounts for the various sources of horizontal offsets and inaccuracies. Navigation Data and Processing: During field activity 2023-001-FA, Differential Global Positioning System (DGPS) navigation was used. For the May survey day, the DGPS was set to receive fixes at 4 hertz (Hz) or 4 records per second in geographic coordinates (Geographic Coordinate System [GCS] World Geodetic System of 1984 [WGS 84]). For the June survey days, the DGPS was set to receive fixes at 2 Hz or 2 records per second. A key factor of potential inaccuracy is the location of the recorded position. The coordinates embedded in each image's metadata correspond to the position of the DGPS antenna on the survey vessel, not the exact location of the SEABOSS on the seafloor. For the survey day in May, the DGPS antenna was located on the R/V Rafael's aft starboard side of the wheelhouse and for the June survey days the antenna was on the aft port side of the wheelhouse. In both cases, the antenna was approximately 2-3 meters from the SEABOSS deployment location. No layback or offset was applied to correct for this physical separation or for the SEABOSS potentially drifting away from the vessel when deployed to the seafloor. Data Management and Discrepancies: A comparison of the SEABOSS's DGPS and the ship's navigation data at three locations on the first day showed them to be less than one meter apart. It is important to note that the navigation data were processed differently for the bottom photos and the video tracklines, meaning these datasets may not always intersect exactly with the sample site location. Vertical_Positional_Accuracy: Vertical_Positional_Accuracy_Report: Depths values recorded in the CSV and shapefile are referenced to MLLW tidal datum. Depths were extracted using the published locations of the samples and the published bathymetry grid from this publication and 2022-001-FA. See Processing Step 2 for details. In general the vertical accuracy of the bathymetry is approximately 1 percent of water depth. However, any inaccuracies in the vertical component are far outweighed by the inaccuracies inherent in the method used to record the x,y coordinates of the sample as described above. Lineage: Process_Step: Process_Description: STEP 1: COLLECTED DATA. A marine geophysical and sampling survey (field activity 2023-001-FA) was conducted in Nantucket Sound, Massachusetts, in the vicinity of Horseshoe Shoal in May and June 2023. The ground validation data was collected while the R/V Rafael occupied one of the target sites, and the SEABOSS 2.0 was deployed off the vessel's portside. The SEABOSS was equipped with a modified Van Veen grab sampler, a FLIR Blackfly S BFS-PGE-50S5M-C digital camera with a topside feed, an oblique downward-looking DeepSea Power & Light HD Multi SeaCam video camera with a topside feed, and DeepSea Power & Light LED SeaLites to illuminate the sea floor for video and photograph collection. The elements of this particular SEABOSS were held within a stainless-steel frame that measured ~1 x 1 meter. The frame had a stabilizer fin that oriented the system as it drifted over the seabed. Two red lasers were set 20 centimeters apart (both as they were mounted on the SEABOSS frame and as seen in photographs and video on the seabed) for scale measurements. The red laser dots can usually be seen in the sea-floor photos and videos depending on the bottom type, water clarity, and distance to the sea floor. The winch operator lowered the SEABOSS until the sea floor was observed in the topside live video feed. Generally, the vessel and SEABOSS drifted with wind and current for up to a few minutes to ensure a decent photo with a clear view of the sea floor was acquired. A scientist monitored the real-time bottom video and acquired bottom photographs at points of interest by remotely triggering the FLIR camera shutter. The photographed area is most often within 0.5 to 1.25 meters from left to right. Bottom video was also recorded during the drift from the oblique downward-looking DeepSea Power & Light HD Multi SeaCam video camera directly to a solid-state drive using an Odyssey7 video recorder. Due to equipment overheating issues, the FLIR camera stopped working after site 2023-001-050, so still-image frame grabs were captured from the DeepSea Power & Light bottom videos for the last 10 sites (sites 2023-001-051 through 2023-001-060) described in a subsequent process step. After drifting for up to a few minutes, the winch operator lowered the SEABOSS sampler until it rested on the sea floor. When the system was raised, the Van Veen grab sampler closed and collected a sample as it was lifted off the sea floor. The sampler was recovered to the deck of the survey vessel where a subsample was taken for grain-size analysis at the sediment laboratory at the USGS Woods Hole Coastal and Marine Science Center. During the survey, DGPS navigation from a Hemisphere R131 DGPS receiver (see Positional_Accuracy statement above for more info). Dates and times were recorded in UTC. When the FLIR camera shutter was remotely triggered to take a photo, the photo filename and navigation data for that timestamp were saved to a CSV file, which was used to geotag the images in a subsequent process step. The DGPS data were also overlaid onto the video using a Proteus-V Pro video overlay device. A survey log was maintained during the field activity by the technical and scientific staff as an Excel spreadsheet. It contains information about bottom photo and video acquisition, sediment sampling, and other miscellaneous notes from the survey. A total of 59 sediment samples were collected using the SEABOSS 2.0 at 60 sites during field activity 2023-001-FA. Bottom imagery was collected at all 60 sites. Process_Date: 20230614 Source_Produced_Citation_Abbreviation: Original FLIR TIFF photographs Source_Produced_Citation_Abbreviation: DeepSea Power & Light bottom videos Source_Produced_Citation_Abbreviation: Survey log Source_Produced_Citation_Abbreviation: Photo navigation CSV files Survey log Source_Produced_Citation_Abbreviation: Raw navigation data Source_Produced_Citation_Abbreviation: Sediment samples Process_Contact: Contact_Information: Contact_Person_Primary: Contact_Person: Seth Ackerman Contact_Organization: U.S. Geological Survey Contact_Position: Geologist Contact_Address: Address_Type: mailing and physical address Address: 384 Woods Hole Rd. City: Woods Hole State_or_Province: MA Postal_Code: 02543-1598 Country: USA Contact_Voice_Telephone: 508-548-8700 x2315 Contact_Facsimile_Telephone: 508-457-2310 Contact_Electronic_Mail_Address: sackerman@usgs.gov Process_Step: Process_Description: STEP 2: ASSEMBLED SAMPLE INFORMATION FOR SEDIMENT LABORATORY. The sediment sample times (as recorded in the survey log) were checked by viewing the bottom videos to see when the sampler was lifted off the sea floor at each site and updated with more precise times as appropriate. The latitude and longitude from the video overlay at the time of the sample were also noted for each sediment sample. Sites from the survey day in May had no video overlay so the sample time as recorded on that day was correlated to the ship's navigation log to determine the GPS position. Depths for each sample were extracted from a composite bathymetry dataset for coastal Massachusetts. These depths were updated from a bathymetry grid of the newer data from this mapping program (field activities 2022-001-FA and 2023-001-FA (see Process Step 5). This information was then provided to the sediment laboratory at the USGS Woods Hole Coastal and Marine Science Center with the sample analysis request form for the survey. Source_Used_Citation_Abbreviation: Survey log Source_Used_Citation_Abbreviation: Bottom videos Source_Used_Citation_Abbreviation: Composite bathymetry Process_Date: 20230718 Source_Produced_Citation_Abbreviation: Survey log with updated sample times Source_Produced_Citation_Abbreviation: Sediment sample locations CSV file Process_Contact: Contact_Information: Contact_Person_Primary: Contact_Person: Seth Ackerman Contact_Organization: U.S. Geological Survey Contact_Position: Geologist Contact_Address: Address_Type: mailing and physical address Address: 384 Woods Hole Rd. City: Woods Hole State_or_Province: MA Postal_Code: 02543-1598 Country: USA Contact_Voice_Telephone: 508-548-8700 x2315 Contact_Facsimile_Telephone: 508-457-2310 Contact_Electronic_Mail_Address: sackerman@usgs.gov Process_Step: Process_Description: STEP 3: SAMPLE ANALYSIS Samples submitted to the Sediment Laboratory for grain size analysis using the Horiba laser diffraction unit (LA-960) and sieving of the ≥ -2 phi fraction are assigned unique analysis identifiers (ANALYSIS_ID), and divided into batches of no more than 30 samples. Each batch is entered into a Microsoft Excel data entry spreadsheet (LD Worksheet Template_SA14.xlsx, where SA14 is the identifier assigned to the sample submission) to record the initial and dried sample weights, as well as the sieved coarse fraction weights. Each batch is also is entered into macro-enabled Microsoft Excel data entry spreadsheets (SA14_GrainSizeWorksheet_LD1-30.xlsm or SA14_GrainSizeWorksheet_LD31-60.xlsm, where SA14 is the identifier assigned to the sample submission, “LD1-30” and “LD31-60” refer to the pre-labeled and weighed glass laser diffraction vials the samples will be run in) to record the measurement data coming from the laser diffraction unit and incorporate the initial, dried, and sieved weights.About 5-10 grams of wet sediment or 3-5 grams of dry sediment are placed in a pre-weighed beaker and the gross weight is recorded. The sample is wet sieved through a 4 mm (No. 5) sieve. If there is any coarse fraction remaining in the sieve, the coarse material is oven dried at 100°C in a pre-weighed beaker, and weighed again when dry. This coarse fraction is dry sieved to determine the individual weights of the -2 to -5 phi fractions, and the weights are recorded in the data entry spreadsheet LD Worksheet Template_SA14.xlsx. The fine fraction in water is collected in a pre-labeled and weighed glass laser diffraction vial. If there is any coarse fraction remaining in the sieve from wet sieving, this vial is also oven dried at 100°C and weighed when dry. If there is no coarse fraction remaining from wet sieving, the sample can proceed directly to processing for analyses by the Horiba laser diffraction unit (LA-960).Fine fractions ready for analysis by the Horiba laser diffraction unit are rehydrated with distilled water if they’ve been dry. Fifteen (15) ml of pre-mixed 40 g/l sodium hexametaphosphate [(NaPO3)6] are added to each sample. If the height of the fluid in the laser diffraction vial is less than 5 cm, more distilled water is added to raise the level to no more than 8 cm in the vial. The samples are gently stirred, covered, and allowed to soak for at least 1 hour (for samples that were not dried) up to 24 hours (for samples that were dried). Soaked vials are placed into an ultrasonic bath and run for 10 minutes at a frequency of 37 Hz with a power level of 100. If the samples appear to be fully disaggregated, they are placed into pre-determined autosampler locations, and are run using the Horiba LA-960 for Windows software to get the fine fraction grain size distributions. The fine fraction distribution data are added to the appropriate data entry spreadsheets (SA14_GrainSizeWorksheet_LD1-30 or SA14_GrainSizeWorksheet_LD31-60.xlsm). The spreadsheet is used to calculate a continuous phi class distribution from the original fractions. Data from this submission were processed using version 2.3 of the data entry spreadsheet. Process_Date: 202405 Process_Contact: Contact_Information: Contact_Organization_Primary: Contact_Organization: U.S. Geological Survey Contact_Position: Sediment Laboratory Manager Contact_Address: Address_Type: mailing and physical address Address: 384 Woods Hole Road City: Woods Hole State_or_Province: MA Postal_Code: 02543-1598 Country: USA Contact_Voice_Telephone: (508) 548-8700 Contact_Facsimile_Telephone: (508) 457-2310 Process_Step: Process_Description: STEP 4: ADDITIONAL SAMPLE CALCULATIONS Continuous phi class distribution from the original fractions are transposed to the "results" tab in the macro-enabled Microsoft Excel data entry workbook (SA14_GrainSizeWorksheet_LD1-30.xlsm or SA14_GrainSizeWorksheet_LD31-60.xlsm, where SA14 is the identifier assigned to the sample submission, “LD1-30” and “LD31-60” refer to the pre-labeled and weighed glass laser diffraction vials the samples will be run in). Macros in the workbook (“GS_MoM_Arithmetic_1”, “GS_MoM_Arithmetic_2”, "GS_statistics", and "sedimentname") are run to calculate grain size classification and statistical analyses and finish processing the data. Sample, navigation, and field identifiers, along with continuous phi class distribution data, grain size classification, and statistical analysis results are copied and pasted into a final Microsoft Excel spreadsheet (SA14_GS-LD_results.xlsx, where SA14 is the batch number assigned to the sample submission). The processed data are quality control checked and assigned a quality grade based on the examination of the analytical data. Processed data are released to the submitter and incorporated into the laboratory's database. All raw analytical data generated by the samples are archived in the Sediment Laboratory. Process_Date: 20240516 Process_Contact: Contact_Information: Contact_Organization_Primary: Contact_Organization: U.S. Geological Survey Contact_Position: Sediment Laboratory Manager Contact_Address: Address_Type: mailing and physical address Address: 384 Woods Hole Road City: Woods Hole State_or_Province: MA Postal_Code: 02543-1598 Country: USA Contact_Voice_Telephone: (508) 548-8700 Contact_Facsimile_Telephone: (508) 457-2310 Contact_Electronic_Mail_Address: gs-wh_sedlab@usgs.gov Process_Step: Process_Description: STEP 5: CONVERT XLSX TO CSV AND SHAPEFILE The sediment laboratory Excel spreadsheet was saved as a CSV file, column headers were modified, and the CSV file was imported into QGIS (version 3.34.7) as a delimited text layer. The resulting spatial dataset was saved as an Esri shapefile format. Process_Date: 20240809 Process_Contact: Contact_Information: Contact_Person_Primary: Contact_Person: Seth Ackerman Contact_Organization: U.S. Geological Survey Contact_Position: Geologist Contact_Address: Address_Type: mailing and physical address Address: 384 Woods Hole Rd. City: Woods Hole State_or_Province: MA Postal_Code: 02543-1598 Country: USA Contact_Voice_Telephone: 508-548-8700 x2315 Contact_Facsimile_Telephone: 508-457-2310 Contact_Electronic_Mail_Address: sackerman@usgs.gov Process_Step: Process_Description: STEP 6: UPDATE DEPTHS New depths for each sample were extracted from a composite bathymetry created from the bathymetry grid in this publication and from survey 2022-001-FA (2022_2023_NtktSnd_Merge_MLLW_2m.tif) using the geoprocessing tool "Sample Raster Values" in QGIS 3.34.7. A new final shapefile was exported. Depths were also updated in the XLXS and CSV files. The new depth data were provided back to the Sediment Laboratory to update these sample records in their database. Process_Date: 20250911 Process_Contact: Contact_Information: Contact_Person_Primary: Contact_Person: Seth Ackerman Contact_Organization: U.S. Geological Survey Contact_Position: Geologist Contact_Address: Address_Type: mailing and physical address Address: 384 Woods Hole Rd. City: Woods Hole State_or_Province: MA Postal_Code: 02543-1598 Country: USA Contact_Voice_Telephone: 508-548-8700 x2315 Contact_Facsimile_Telephone: 508-457-2310 Contact_Electronic_Mail_Address: sackerman@usgs.gov Spatial_Data_Organization_Information: Direct_Spatial_Reference_Method: Point Point_and_Vector_Object_Information: SDTS_Terms_Description: SDTS_Point_and_Vector_Object_Type: Entity point Point_and_Vector_Object_Count: 59 Spatial_Reference_Information: Horizontal_Coordinate_System_Definition: Geographic: Latitude_Resolution: 0.000001 Longitude_Resolution: 0.000001 Geographic_Coordinate_Units: Decimal degrees Geodetic_Model: Horizontal_Datum_Name: D_WGS_1984 Ellipsoid_Name: WGS_1984 Semi-major_Axis: 6378137.000000 Denominator_of_Flattening_Ratio: 298.257224 Entity_and_Attribute_Information: Detailed_Description: Entity_Type: Entity_Type_Label: 2023-001-FA_samples.csv Entity_Type_Definition: The CSV file created from the XLSX file provided by the USGS Sediment Laboratory. This file contains the grain size analysis results for sample submission SA14, analyzed using the Horiba laser diffraction unit and sieving of the ≥ -2 phi fraction. Note the sample depths were updated as described in Process Step 6. Entity_Type_Definition_Source: U.S. Geological Survey Attribute: Attribute_Label: ANALYSIS_ID Attribute_Definition: An identifier for the sample which is unique to the database. This identifier begins with the assigned multi-letter code GS-, which corresponds to the type of analysis performed on the sample (grain size analysis), followed by a six-digit number assigned sequentially as samples are registered for analysis. Attribute_Definition_Source: U.S. Geological Survey Attribute_Domain_Values: Unrepresentable_Domain: Character set Attribute: Attribute_Label: SAMPLE_ID Attribute_Definition: The identification value assigned to the sample at the time of collection. This varies from field activity to field activity and the ID can contain any combination of letters and numbers. Attribute_Definition_Source: U.S. Geological Survey Attribute_Domain_Values: Unrepresentable_Domain: Character set Attribute: Attribute_Label: PROJECT Attribute_Definition: Name of project or project number under which samples were taken or data generated; sometimes project name indicates a more specific area. Attribute_Definition_Source: U.S. Geological Survey Attribute_Domain_Values: Unrepresentable_Domain: Character set Attribute: Attribute_Label: FAN Attribute_Definition: The serial number assigned to the dataset field activity from which the sample belongs. This value is in the format YYYY-XXX-FA where YYYY is the year, XXX is the number assigned to the activity within the year, and FA indicates Field Activity. Attribute_Definition_Source: U.S. Geological Survey Attribute_Domain_Values: Unrepresentable_Domain: Character set Attribute: Attribute_Label: SUBMITTER Attribute_Definition: Name of Principal investigator or chief scientist responsible for data collection, or researcher submitting samples for analysis (usually first initial and last name). Attribute_Definition_Source: U.S. Geological Survey Attribute_Domain_Values: Unrepresentable_Domain: Character set Attribute: Attribute_Label: AREA Attribute_Definition: General geographic area of data collection. Name is general enough to easily locate area on a map. Attribute_Definition_Source: U.S. Geological Survey Attribute_Domain_Values: Unrepresentable_Domain: Character set Attribute: Attribute_Label: LATITUDE Attribute_Definition: Latitude coordinate, in decimal-degrees, of sample location. South latitude recorded as negative values. Attribute_Definition_Source: U.S. Geological Survey Attribute_Domain_Values: Range_Domain: Range_Domain_Minimum: 41.50332379 Range_Domain_Maximum: 41.57544647 Attribute_Units_of_Measure: decimal degrees Attribute_Measurement_Resolution: 0.0000001 Attribute: Attribute_Label: LONGITUDE Attribute_Definition: Longitude coordinate, in decimal degrees, of sample location. West longitude is recorded as negative values. Attribute_Definition_Source: U.S. Geological Survey Attribute_Domain_Values: Range_Domain: Range_Domain_Minimum: -70.47943085 Range_Domain_Maximum: -70.29029622 Attribute_Units_of_Measure: decimal degrees Attribute_Measurement_Resolution: 0.0000001 Attribute: Attribute_Label: DEPTH_M Attribute_Definition: Measured depth of water overlying sediment at sample time, generally not corrected for tides, in meters. Entries with no depth indicated are left blank. Attribute_Definition_Source: U.S. Geological Survey Attribute_Domain_Values: Range_Domain: Range_Domain_Minimum: -28.7 Range_Domain_Maximum: -4.0 Attribute_Units_of_Measure: meters Attribute_Measurement_Resolution: 0.1 Attribute: Attribute_Label: T_DEPTH Attribute_Definition: Top depth of the sample below the sediment-water interface, in centimeters. Entries with no depth indicated are left blank. Attribute_Definition_Source: U.S. Geological Survey Attribute_Domain_Values: Range_Domain: Range_Domain_Minimum: 0 Range_Domain_Maximum: 0 Attribute_Units_of_Measure: centimeters Attribute_Measurement_Resolution: 1 Attribute: Attribute_Label: B_DEPTH Attribute_Definition: Bottom depth of the sample below the sediment-water interface, in centimeters. Entries with no depth indicated are left blank. Attribute_Definition_Source: U.S. Geological Survey Attribute_Domain_Values: Range_Domain: Range_Domain_Minimum: 2 Range_Domain_Maximum: 2 Attribute_Units_of_Measure: centimeter Attribute_Measurement_Resolution: 1 Attribute: Attribute_Label: DEVICE Attribute_Definition: Device used to collect the sample. Below lists all possible sample collection devices, please note that all devices may not be present in the table. Entries with no device indicated are left blank. Attribute_Definition_Source: U.S. Geological Survey Attribute_Domain_Values: Enumerated_Domain: Enumerated_Domain_Value: SEABOSS 2.0 Enumerated_Domain_Value_Definition: Collection device name provided by the sample submitter. Enumerated_Domain_Value_Definition_Source: U.S. Geological Survey Attribute: Attribute_Label: DATE COLLECTED Attribute_Definition: Calendar date indicating when the sample was collected in the format MM/DD/YYYY where DD is the day of the month, MM is the numeric month, and YYYY is the year. Entries with no date indicated are left blank. Attribute_Definition_Source: U.S. Geological Survey Attribute_Domain_Values: Unrepresentable_Domain: Character set Attribute: Attribute_Label: ANALYSIS COMPLETION DATE Attribute_Definition: Calendar date indicating when analyses on the sample were completed in the format MM/DD/YYYY where DD is the day of the month, MM is the numeric month, and YYYY is the year. Attribute_Definition_Source: U.S. Geological Survey Attribute_Domain_Values: Unrepresentable_Domain: Character set Attribute: Attribute_Label: WEIGHT Attribute_Definition: Weight of initial sample in grams. Attribute_Definition_Source: U.S. Geological Survey Attribute_Domain_Values: Range_Domain: Range_Domain_Minimum: 7.0335 Range_Domain_Maximum: 31.4686 Attribute_Units_of_Measure: grams Attribute_Measurement_Resolution: .0001 Attribute: Attribute_Label: GRAVEL_PCT Attribute_Definition: Gravel content in percent dry weight of the sample (particles with nominal diameters greater than 2 mm; -1 phi and larger). Attribute_Definition_Source: U.S. Geological Survey Attribute_Domain_Values: Range_Domain: Range_Domain_Minimum: 0.0 Range_Domain_Maximum: 57.2461 Attribute_Units_of_Measure: weight percent Attribute_Measurement_Resolution: .0001 Attribute: Attribute_Label: SAND_PCT Attribute_Definition: 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). Attribute_Definition_Source: U.S. Geological Survey Attribute_Domain_Values: Range_Domain: Range_Domain_Minimum: 18.8427 Range_Domain_Maximum: 100.004 Attribute_Units_of_Measure: weight percent Attribute_Measurement_Resolution: .0001 Attribute: Attribute_Label: SILT_PCT Attribute_Definition: 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). Attribute_Definition_Source: U.S. Geological Survey Attribute_Domain_Values: Range_Domain: Range_Domain_Minimum: 0.0 Range_Domain_Maximum: 37.8213 Attribute_Units_of_Measure: weight percent Attribute_Measurement_Resolution: .0001 Attribute: Attribute_Label: CLAY_PCT Attribute_Definition: Clay content in percent dry weight of the sample (particles with nominal diameters less than 0.004 mm; 9 phi and smaller). Attribute_Definition_Source: U.S. Geological Survey Attribute_Domain_Values: Range_Domain: Range_Domain_Minimum: 0.0 Range_Domain_Maximum: 12.2545 Attribute_Units_of_Measure: weight percent Attribute_Measurement_Resolution: .0001 Attribute: Attribute_Label: CLASSIFICATION (Shepard) Attribute_Definition: Sediment classification - Sediment description based on a rigorous definition according to Shepard (1954) as modified by Schlee and Webster (1967), Schlee (1973), and Poppe and others (2014). Below lists all possible sediment classifications, please note that all classifications may not be present in the table. Attribute_Definition_Source: Shepard, F.P., 1954; Schlee, J.S., and Webster, Jacqueline, 1967; Schlee, J.S., 1973; Poppe, L.J., McMullen, K.Y., Williams, S.J., and Paskevich, V.F., 2014. Attribute_Domain_Values: Enumerated_Domain: Enumerated_Domain_Value: bedrock Enumerated_Domain_Value_Definition: Solid rock. Enumerated_Domain_Value_Definition_Source: Shepard (1954) as modified by Schlee and Webster (1967), Schlee (1973), and Poppe and others (2014) Attribute_Domain_Values: Enumerated_Domain: Enumerated_Domain_Value: boulders Enumerated_Domain_Value_Definition: Rocks with diameters greater than 256 mm. Enumerated_Domain_Value_Definition_Source: Shepard (1954) as modified by Schlee and Webster (1967), Schlee (1973), and Poppe and others (2014) Attribute_Domain_Values: Enumerated_Domain: Enumerated_Domain_Value: clay Enumerated_Domain_Value_Definition: Sediment whose main phase is less than 0.004 mm. Enumerated_Domain_Value_Definition_Source: Shepard (1954) as modified by Schlee and Webster (1967), Schlee (1973), and Poppe and others (2014) Attribute_Domain_Values: Enumerated_Domain: Enumerated_Domain_Value: clayey sand Enumerated_Domain_Value_Definition: Sediment whose main phase is sand, but with significant clay. Enumerated_Domain_Value_Definition_Source: Shepard (1954) as modified by Schlee and Webster (1967), Schlee (1973), and Poppe and others (2014) Attribute_Domain_Values: Enumerated_Domain: Enumerated_Domain_Value: clayey silt Enumerated_Domain_Value_Definition: Sediment whose main phase is silt, but with significant clay. Enumerated_Domain_Value_Definition_Source: Shepard (1954) as modified by Schlee and Webster (1967), Schlee (1973), and Poppe and others (2014) Attribute_Domain_Values: Enumerated_Domain: Enumerated_Domain_Value: gravel Enumerated_Domain_Value_Definition: Sediment whose main phase is >2 mm. Enumerated_Domain_Value_Definition_Source: Shepard (1954) as modified by Schlee and Webster (1967), Schlee (1973), and Poppe and others (2014) Attribute_Domain_Values: Enumerated_Domain: Enumerated_Domain_Value: gravelly sediment Enumerated_Domain_Value_Definition: Sediment whose main phase is >2 mm, but with significant other sediment. Gravel > 10 percent. Enumerated_Domain_Value_Definition_Source: Shepard (1954) as modified by Schlee and Webster (1967), Schlee (1973), and Poppe and others (2014) Attribute_Domain_Values: Enumerated_Domain: Enumerated_Domain_Value: sand Enumerated_Domain_Value_Definition: Sediment whose main phase is less than 2 mm, but greater than or equal to 0.062 mm. Enumerated_Domain_Value_Definition_Source: Shepard (1954) as modified by Schlee and Webster (1967), Schlee (1973), and Poppe and others (2014) Attribute_Domain_Values: Enumerated_Domain: Enumerated_Domain_Value: sand silt clay Enumerated_Domain_Value_Definition: Sediment with significant (over 20 percent) sand, silt, and clay. Enumerated_Domain_Value_Definition_Source: Shepard (1954) as modified by Schlee and Webster (1967), Schlee (1973), and Poppe and others (2014) Attribute_Domain_Values: Enumerated_Domain: Enumerated_Domain_Value: sandy clay Enumerated_Domain_Value_Definition: Sediment whose main phase is clay, but with significant sand. Enumerated_Domain_Value_Definition_Source: Shepard (1954) as modified by Schlee and Webster (1967), Schlee (1973), and Poppe and others (2014) Attribute_Domain_Values: Enumerated_Domain: Enumerated_Domain_Value: sandy silt Enumerated_Domain_Value_Definition: Sediment whose main phase is silt, but with significant sand. Enumerated_Domain_Value_Definition_Source: Shepard (1954) as modified by Schlee and Webster (1967), Schlee (1973), and Poppe and others (2014) Attribute_Domain_Values: Enumerated_Domain: Enumerated_Domain_Value: silt Enumerated_Domain_Value_Definition: Sediment whose main phase is less than 0.0625 mm, but greater than or equal to 0.004 mm. Enumerated_Domain_Value_Definition_Source: Shepard (1954) as modified by Schlee and Webster (1967), Schlee (1973), and Poppe and others (2014) Attribute_Domain_Values: Enumerated_Domain: Enumerated_Domain_Value: silty clay Enumerated_Domain_Value_Definition: Sediment whose main phase is clay, but with significant silt. Enumerated_Domain_Value_Definition_Source: Shepard (1954) as modified by Schlee and Webster (1967), Schlee (1973), and Poppe and others (2014) Attribute_Domain_Values: Enumerated_Domain: Enumerated_Domain_Value: silty sand Enumerated_Domain_Value_Definition: Sediment whose main phase in sand, but with significant silt. Enumerated_Domain_Value_Definition_Source: Shepard (1954) as modified by Schlee and Webster (1967), Schlee (1973), and Poppe and others (2014) Attribute_Domain_Values: Enumerated_Domain: Enumerated_Domain_Value: mud Enumerated_Domain_Value_Definition: Sediment whose main phase is less than 0.0625 mm Enumerated_Domain_Value_Definition_Source: Shepard (1954) as modified by Schlee and Webster (1967), Schlee (1973), and Poppe and others (2014) Attribute_Domain_Values: Enumerated_Domain: Enumerated_Domain_Value: muddy sand Enumerated_Domain_Value_Definition: Sediment whose main phase is sand, but with significant silt and clay. Enumerated_Domain_Value_Definition_Source: Shepard (1954) as modified by Schlee and Webster (1967), Schlee (1973), and Poppe and others (2014) Attribute: Attribute_Label: MEAN [Method of Moments Statistics - Logarithmic (φ)] Attribute_Definition: Average value in the grain size distribution in phi units. Attribute_Definition_Source: U.S. Geological Survey Attribute_Domain_Values: Range_Domain: Range_Domain_Minimum: -0.6314 Range_Domain_Maximum: 2.6544 Attribute_Units_of_Measure: phi Attribute_Measurement_Resolution: .0001 Attribute: Attribute_Label: STDEV [Method of Moments Statistics - Logarithmic (φ)] Attribute_Definition: Standard deviation (root mean square of the deviations) of the grain size distribution in phi units (sorting). Attribute_Definition_Source: U.S. Geological Survey Attribute_Domain_Values: Range_Domain: Range_Domain_Minimum: 0.5506 Range_Domain_Maximum: 4.5989 Attribute_Units_of_Measure: phi Attribute_Measurement_Resolution: .0001 Attribute: Attribute_Label: SKEWNESS [Method of Moments Statistics - Logarithmic (φ)] Attribute_Definition: Skewness (unitless deviation from symmetrical form) of the grain size distribution in phi units. Attribute_Definition_Source: U.S. Geological Survey Attribute_Domain_Values: Range_Domain: Range_Domain_Minimum: -1.5099 Range_Domain_Maximum: 3.4657 Attribute_Units_of_Measure: phi Attribute_Measurement_Resolution: .0001 Attribute: Attribute_Label: KURTOSIS [Method of Moments Statistics - Logarithmic (φ)] Attribute_Definition: Kurtosis (unitless degree of curvature near the mode) of the grain size distribution in phi units. Attribute_Definition_Source: U.S. Geological Survey Attribute_Domain_Values: Range_Domain: Range_Domain_Minimum: 1.4292 Range_Domain_Maximum: 24.3815 Attribute_Units_of_Measure: phi Attribute_Measurement_Resolution: .0001 Attribute: Attribute_Label: D10 [Method of Moments Statistics - Logarithmic (φ)] Attribute_Definition: Diameter at which 10% of the sample mass is comprised of sediment particles with a diameter less than this value. Attribute_Definition_Source: U.S. Geological Survey Attribute_Domain_Values: Range_Domain: Range_Domain_Minimum: 1.3144 Range_Domain_Maximum: 8.4702 Attribute_Units_of_Measure: phi Attribute_Measurement_Resolution: .0001 Attribute: Attribute_Label: D25 [Method of Moments Statistics - Logarithmic (φ)] Attribute_Definition: Diameter at which 25% of the sample mass is comprised of sediment particles with a diameter less than this value. Attribute_Definition_Source: U.S. Geological Survey Attribute_Domain_Values: Range_Domain: Range_Domain_Minimum: 0.8528 Range_Domain_Maximum: 5.5344 Attribute_Units_of_Measure: phi Attribute_Measurement_Resolution: .0001 Attribute: Attribute_Label: MEDIAN (D50) [Method of Moments Statistics - Logarithmic (φ)] Attribute_Definition: Diameter at which 50% of the sample mass is comprised of sediment particles with a diameter less than this value and 50% is larger; middle point in the grain size distribution in phi units. Attribute_Definition_Source: U.S. Geological Survey Attribute_Domain_Values: Range_Domain: Range_Domain_Minimum: -4.0748 Range_Domain_Maximum: 3.1202 Attribute_Units_of_Measure: phi Attribute_Measurement_Resolution: .0001 Attribute: Attribute_Label: D75 [Method of Moments Statistics - Logarithmic (φ)] Attribute_Definition: Diameter at which 75% of the sample mass is comprised of sediment particles with a diameter less than this value. Attribute_Definition_Source: U.S. Geological Survey Attribute_Domain_Values: Range_Domain: Range_Domain_Minimum: -4.5374 Range_Domain_Maximum: 1.5774 Attribute_Units_of_Measure: phi Attribute_Measurement_Resolution: .0001 Attribute: Attribute_Label: D90 [Method of Moments Statistics - Logarithmic (φ)] Attribute_Definition: Diameter at which 90% of the sample mass is comprised of sediment particles with a diameter less than this value. Attribute_Definition_Source: U.S. Geological Survey Attribute_Domain_Values: Range_Domain: Range_Domain_Minimum: -4.815 Range_Domain_Maximum: 1.1852 Attribute_Units_of_Measure: phi Attribute_Measurement_Resolution: .0001 Attribute: Attribute_Label: MEAN [Method of Moments Statistics - Arithmetic (μm)] Attribute_Definition: Average value in the grain size distribution in microns. Attribute_Definition_Source: U.S. Geological Survey Attribute_Domain_Values: Range_Domain: Range_Domain_Minimum: 243.5685 Range_Domain_Maximum: 12630.0164 Attribute_Units_of_Measure: microns Attribute_Measurement_Resolution: .0001 Attribute: Attribute_Label: STDEV [Method of Moments Statistics - Arithmetic (μm)] Attribute_Definition: Standard deviation (root mean square of the deviations) of the grain size distribution in microns (sorting). Attribute_Definition_Source: U.S. Geological Survey Attribute_Domain_Values: Range_Domain: Range_Domain_Minimum: 105.9895 Range_Domain_Maximum: 11017.6954 Attribute_Units_of_Measure: microns Attribute_Measurement_Resolution: .0001 Attribute: Attribute_Label: SKEWNESS [Method of Moments Statistics - Arithmetic (μm)] Attribute_Definition: Skewness (unitless deviation from symmetrical form) of the grain size distribution in microns. Attribute_Definition_Source: U.S. Geological Survey Attribute_Domain_Values: Range_Domain: Range_Domain_Minimum: -0.2275 Range_Domain_Maximum: 9.0069 Attribute_Units_of_Measure: microns Attribute_Measurement_Resolution: .0001 Attribute: Attribute_Label: KURTOSIS [Method of Moments Statistics - Arithmetic (μm)] Attribute_Definition: Kurtosis (unitless degree of curvature near the mode) of the grain size distribution in microns. Attribute_Definition_Source: U.S. Geological Survey Attribute_Domain_Values: Range_Domain: Range_Domain_Minimum: 1.0848 Range_Domain_Maximum: 98.8005 Attribute_Units_of_Measure: microns Attribute_Measurement_Resolution: .0001 Attribute: Attribute_Label: D10 [Method of Moments Statistics - Arithmetic (μm)] Attribute_Definition: Diameter at which 10% of the sample mass is comprised of sediment particles with a diameter less than this value. Attribute_Definition_Source: U.S. Geological Survey Attribute_Domain_Values: Range_Domain: Range_Domain_Minimum: 3.1315 Range_Domain_Maximum: 477.8932 Attribute_Units_of_Measure: microns Attribute_Measurement_Resolution: .0001 Attribute: Attribute_Label: D25 [Method of Moments Statistics - Arithmetic (μm)] Attribute_Definition: Diameter at which 25% of the sample mass is comprised of sediment particles with a diameter less than this value. Attribute_Definition_Source: U.S. Geological Survey Attribute_Domain_Values: Range_Domain: Range_Domain_Minimum: 22.2607 Range_Domain_Maximum: 581.9219 Attribute_Units_of_Measure: microns Attribute_Measurement_Resolution: .0001 Attribute: Attribute_Label: MEDIAN (D50) [Method of Moments Statistics - Arithmetic (μm)] Attribute_Definition: Diameter at which 50% of the sample mass is comprised of sediment particles with a diameter less than this value and 50% is larger; middle point in the grain size distribution in microns. Attribute_Definition_Source: U.S. Geological Survey Attribute_Domain_Values: Range_Domain: Range_Domain_Minimum: 124.5854 Range_Domain_Maximum: 17196.1763 Attribute_Units_of_Measure: microns Attribute_Measurement_Resolution: .0001 Attribute: Attribute_Label: D75 [Method of Moments Statistics - Arithmetic (μm)] Attribute_Definition: Diameter at which 75% of the sample mass is comprised of sediment particles with a diameter less than this value. Attribute_Definition_Source: U.S. Geological Survey Attribute_Domain_Values: Range_Domain: Range_Domain_Minimum: 310.5243 Range_Domain_Maximum: 24598.0881 Attribute_Units_of_Measure: microns Attribute_Measurement_Resolution: .0001 Attribute: Attribute_Label: D90 [Method of Moments Statistics - Arithmetic (μm)] Attribute_Definition: Diameter at which 90% of the sample mass is comprised of sediment particles with a diameter less than this value. Attribute_Definition_Source: U.S. Geological Survey Attribute_Domain_Values: Range_Domain: Range_Domain_Minimum: 395.2083 Range_Domain_Maximum: 29039.2353 Attribute_Units_of_Measure: microns Attribute_Measurement_Resolution: .0001 Attribute: Attribute_Label: PHI_16 Attribute_Definition: 16 phi: weight percent of the sample in the 16 phi fraction and smaller (nominal diameter of particles greater than or equal to 0.000015625 mm, less than 0.00003125 mm); colloid. Attribute_Definition_Source: U.S. Geological Survey Attribute_Domain_Values: Range_Domain: Range_Domain_Minimum: 0.0 Range_Domain_Maximum: 0.0 Attribute_Units_of_Measure: weight percent Attribute_Measurement_Resolution: .001 Attribute: Attribute_Label: PHI_15 Attribute_Definition: 15 phi: weight percent of the sample in the 15 phi fraction (nominal diameter of particles greater than or equal to 0.00003125 mm, less than 0.0000625 mm); colloid. Attribute_Definition_Source: U.S. Geological Survey Attribute_Domain_Values: Range_Domain: Range_Domain_Minimum: 0.0 Range_Domain_Maximum: 0.0 Attribute_Units_of_Measure: weight percent Attribute_Measurement_Resolution: .001 Attribute: Attribute_Label: PHI_14 Attribute_Definition: 14 phi: weight percent of the sample in the 14 phi fraction (nominal diameter of particles greater than or equal to 0.0000625 mm, less than 0.000125 mm); colloid. Attribute_Definition_Source: U.S. Geological Survey Attribute_Domain_Values: Range_Domain: Range_Domain_Minimum: 0.0 Range_Domain_Maximum: 0.0 Attribute_Units_of_Measure: weight percent Attribute_Measurement_Resolution: .001 Attribute: Attribute_Label: PHI_13 Attribute_Definition: 13 phi: weight percent of the sample in the 13 phi fraction (nominal diameter of particles greater than or equal to 0.000125 mm, less than 0.00025 mm); fine clay. Attribute_Definition_Source: U.S. Geological Survey Attribute_Domain_Values: Range_Domain: Range_Domain_Minimum: 0.0 Range_Domain_Maximum: 0.0 Attribute_Units_of_Measure: weight percent Attribute_Measurement_Resolution: .001 Attribute: Attribute_Label: PHI_12 Attribute_Definition: 12 phi: weight percent of the sample in the 12 phi fraction (nominal diameter of particles greater than or equal to 0.00025 mm, but less than 0.0005 mm); fine clay. Attribute_Definition_Source: U.S. Geological Survey Attribute_Domain_Values: Range_Domain: Range_Domain_Minimum: 0.0 Range_Domain_Maximum: 3.191 Attribute_Units_of_Measure: weight percent Attribute_Measurement_Resolution: .001 Attribute: Attribute_Label: PHI_11 Attribute_Definition: 11 phi: weight percent of the sample in the 11 phi fraction (nominal diameter of particles greater than or equal to 0.0005 mm, but less than 0.001 mm); fine clay. Attribute_Definition_Source: U.S. Geological Survey Attribute_Domain_Values: Range_Domain: Range_Domain_Minimum: 0.0 Range_Domain_Maximum: 2.49 Attribute_Units_of_Measure: weight percent Attribute_Measurement_Resolution: .001 Attribute: Attribute_Label: PHI_10 Attribute_Definition: 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. Attribute_Definition_Source: U.S. Geological Survey Attribute_Domain_Values: Range_Domain: Range_Domain_Minimum: 0.0 Range_Domain_Maximum: 1.824 Attribute_Units_of_Measure: weight percent Attribute_Measurement_Resolution: .001 Attribute: Attribute_Label: PHI_9 Attribute_Definition: 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. Attribute_Definition_Source: U.S. Geological Survey Attribute_Domain_Values: Range_Domain: Range_Domain_Minimum: 0.0 Range_Domain_Maximum: 4.749 Attribute_Units_of_Measure: weight percent Attribute_Measurement_Resolution: .001 Attribute: Attribute_Label: PHI_8 Attribute_Definition: 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. Attribute_Definition_Source: U.S. Geological Survey Attribute_Domain_Values: Range_Domain: Range_Domain_Minimum: 0.0 Range_Domain_Maximum: 4.968 Attribute_Units_of_Measure: weight percent Attribute_Measurement_Resolution: .001 Attribute: Attribute_Label: PHI_7 Attribute_Definition: 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. Attribute_Definition_Source: U.S. Geological Survey Attribute_Domain_Values: Range_Domain: Range_Domain_Minimum: 0.0 Range_Domain_Maximum: 14.936 Attribute_Units_of_Measure: weight percent Attribute_Measurement_Resolution: .001 Attribute: Attribute_Label: PHI_6 Attribute_Definition: 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. Attribute_Definition_Source: U.S. Geological Survey Attribute_Domain_Values: Range_Domain: Range_Domain_Minimum: 0.0 Range_Domain_Maximum: 10.298 Attribute_Units_of_Measure: weight percent Attribute_Measurement_Resolution: .001 Attribute: Attribute_Label: PHI_5 Attribute_Definition: 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. Attribute_Definition_Source: U.S. Geological Survey Attribute_Domain_Values: Range_Domain: Range_Domain_Minimum: 0.0 Range_Domain_Maximum: 7.619 Attribute_Units_of_Measure: weight percent Attribute_Measurement_Resolution: .001 Attribute: Attribute_Label: PHI_4 Attribute_Definition: 4 phi: weight percent of the sample in the 4 phi fraction (nominal diameters of particles greater than or equal to .0625 mm, but less than 0.125 mm); very fine sand. Attribute_Definition_Source: U.S. Geological Survey Attribute_Domain_Values: Range_Domain: Range_Domain_Minimum: 0.0 Range_Domain_Maximum: 13.501 Attribute_Units_of_Measure: weight percent Attribute_Measurement_Resolution: .001 Attribute: Attribute_Label: PHI_3 Attribute_Definition: 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. Attribute_Definition_Source: U.S. Geological Survey Attribute_Domain_Values: Range_Domain: Range_Domain_Minimum: 0.283 Range_Domain_Maximum: 48.55 Attribute_Units_of_Measure: weight percent Attribute_Measurement_Resolution: .001 Attribute: Attribute_Label: PHI_2 Attribute_Definition: 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. Attribute_Definition_Source: U.S. Geological Survey Attribute_Domain_Values: Range_Domain: Range_Domain_Minimum: 3.305 Range_Domain_Maximum: 70.336 Attribute_Units_of_Measure: weight percent Attribute_Measurement_Resolution: .001 Attribute: Attribute_Label: PHI_1 Attribute_Definition: 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. Attribute_Definition_Source: U.S. Geological Survey Attribute_Domain_Values: Range_Domain: Range_Domain_Minimum: 0.0 Range_Domain_Maximum: 71.725 Attribute_Units_of_Measure: weight percent Attribute_Measurement_Resolution: .001 Attribute: Attribute_Label: PHI_0 Attribute_Definition: 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. Attribute_Definition_Source: U.S. Geological Survey Attribute_Domain_Values: Range_Domain: Range_Domain_Minimum: 0.0 Range_Domain_Maximum: 14.158 Attribute_Units_of_Measure: weight percent Attribute_Measurement_Resolution: .001 Attribute: Attribute_Label: PHI_-1 Attribute_Definition: -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). Attribute_Definition_Source: U.S. Geological Survey Attribute_Domain_Values: Range_Domain: Range_Domain_Minimum: 0.0 Range_Domain_Maximum: 0.782 Attribute_Units_of_Measure: weight percent Attribute_Measurement_Resolution: .001 Attribute: Attribute_Label: PHI_-2 Attribute_Definition: -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. Attribute_Definition_Source: U.S. Geological Survey Attribute_Domain_Values: Range_Domain: Range_Domain_Minimum: 0.0 Range_Domain_Maximum: 21.447 Attribute_Units_of_Measure: weight percent Attribute_Measurement_Resolution: .001 Attribute: Attribute_Label: PHI_-3 Attribute_Definition: -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. Attribute_Definition_Source: U.S. Geological Survey Attribute_Domain_Values: Range_Domain: Range_Domain_Minimum: 0.0 Range_Domain_Maximum: 27.139 Attribute_Units_of_Measure: weight percent Attribute_Measurement_Resolution: .001 Attribute: Attribute_Label: PHI_-4 Attribute_Definition: -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. Attribute_Definition_Source: U.S. Geological Survey Attribute_Domain_Values: Range_Domain: Range_Domain_Minimum: 0.0 Range_Domain_Maximum: 54.04 Attribute_Units_of_Measure: weight percent Attribute_Measurement_Resolution: .001 Attribute: Attribute_Label: PHI_-5 Attribute_Definition: -5 phi: weight percent of the sample in the -5 phi fraction (nominal diameter of particles greater than or equal to 32 mm, but less than 64 mm); very coarse pebbles. Attribute_Definition_Source: U.S. Geological Survey Attribute_Domain_Values: Range_Domain: Range_Domain_Minimum: 0.0 Range_Domain_Maximum: 0.0 Attribute_Units_of_Measure: weight percent Attribute_Measurement_Resolution: .001 Attribute: Attribute_Label: PHI_-6 Attribute_Definition: -6 phi: weight percent of the sample in the -6 phi fraction and larger (nominal diameter of particles greater than or equal to 64 mm, but less than 128 mm); cobbles. Attribute_Definition_Source: U.S. Geological Survey Attribute_Domain_Values: Range_Domain: Range_Domain_Minimum: 0.0 Range_Domain_Maximum: 0.0 Attribute_Units_of_Measure: weight percent Attribute_Measurement_Resolution: .001 Attribute: Attribute_Label: ANALYST Attribute_Definition: Name (usually first, middle, and last initials) of person who performed the grain size or physical properties analysis. Attribute_Definition_Source: U.S. Geological Survey Attribute_Domain_Values: Unrepresentable_Domain: Character set Attribute: Attribute_Label: QUALITY GRADE Attribute_Definition: Samples are assigned a quality grade based on the examination of the analytical data. Data quality grades may be determined by several factors, such as consistency with samples collected from a geospatially adjacent location and consistencybetween replicate runs, and any comments or notes that indicate the data for a particular sample may be suspect are included in the results table for that sample under "comments". When considering replicate run values, if there is over a 10% difference between relative fraction percentages in this sample and the replicate, a quality grade of B will be assigned, over 15% would be assigned a C, and over 20% would be assigned a D. Quality grades for sample data that do not have any additional comments are assigned based on the calculated percent difference between the weights of the coarse fraction remaining after wet sieving and the sum of all of the weighed fractions after dry sieving the coarse fraction, indicating an estimated differing amount of material which could skew the calculated grain size results: A = percent differences between 0% and ±1.5%, B = percent differences between ±1.5% and ±3%, C = percent differences between ±3% and ±4.5%, and D = percent differences greater than ±4.5%. The quality grade is followed by a hyphen and the initials of the person who assigned the grade: BJB is Brian J Buczkowski; JDC is Jason D Chaytor; SJW is Sarah J Widlansky. Attribute_Definition_Source: U.S. Geological Survey Attribute_Domain_Values: Enumerated_Domain: Enumerated_Domain_Value: A Enumerated_Domain_Value_Definition: percent differences between 0% and ±1.5%, there is less than 10% difference in relative fraction percentages between this sample and the replicate, or the results are consistent with expected values. Enumerated_Domain_Value_Definition_Source: U.S. Geological Survey Attribute_Domain_Values: Enumerated_Domain: Enumerated_Domain_Value: B Enumerated_Domain_Value_Definition: percent differences between ±1.5% and ±3%, there is greater than 10% and less than 15% difference in relative fraction percentages between this sample and the replicate, or the results are generally consistent with expected values. Enumerated_Domain_Value_Definition_Source: U.S. Geological Survey Attribute_Domain_Values: Enumerated_Domain: Enumerated_Domain_Value: C Enumerated_Domain_Value_Definition: percent differences between ±3% and ±4.5%, there is greater than 15% and less than 20% difference in relative fraction percentages between this sample and the replicate, or the results are somewhat consistent with expected values. Enumerated_Domain_Value_Definition_Source: U.S. Geological Survey Attribute_Domain_Values: Enumerated_Domain: Enumerated_Domain_Value: D Enumerated_Domain_Value_Definition: percent differences greater than ±4.5%, there is greater than 20% difference in relative fraction percentages between this sample and the replicate, or the results are inconsistent with expected values. Enumerated_Domain_Value_Definition_Source: U.S. Geological Survey Attribute_Domain_Values: Unrepresentable_Domain: Character set Detailed_Description: Entity_Type: Entity_Type_Label: 2023-001-FA_samples.shp Entity_Type_Definition: The shapefile, containing 59 point features, has a subset of the fields from the grain-size analysis results CSV file (2023-001-FA_samples.csv). Specifically, the diameter Method of Moments Statistics (e.g. D10) and the individual phi measurements (e.g., PHI_13) were removed. The shapefile also has two additional attributes, FID and Shape, which have the following descriptions: Attribute: Attribute Label: FID Attribute Definition: Internal feature number. Attribute Definition Source: Esri Attribute Domain Values: Unrepresentable Domain: Sequential unique whole numbers that are automatically generated. Attribute: Attribute Label: Shape Attribute Definition: Feature geometry. Attribute Definition Source: Esri Attribute Domain Values: Unrepresentable Domain: Coordinates defining the features. All the other attributes in the shapefile have the same definitions as the CSV file attributes (see the Detailed Description section above for 2023-001-FA_samples.csv for definitions of the file attributes). Please note that some of the field names were truncated since a shapefile field name can only contain up to 10 characters: ANALYSIS_I (truncated field name for ANALYSIS_ID), DATE_COLLE (truncated field name for DATE_COLLECTED), ANALYSIS_C (truncated field name for ANALYSIS_COMPLETION_DATE), and CLASSIFICA (truncated field name for CLASSIFICATION). Entity_Type_Definition_Source: U.S. Geological Survey Overview_Description: Entity_and_Attribute_Overview: The CSV file contains the sediment analyses as received from the sediment lab (but with the updated depth data). The column headers of CSV file is slightly modified from the original data provided by the sediment laboratory in order to enable import into GIS software. The shapefile is a simplified version of the sediment lab analyses (see the Entity Type Definition for more details). Entity_and_Attribute_Detail_Citation: U.S. Geological Survey Distribution_Information: Distributor: Contact_Information: Contact_Organization_Primary: Contact_Organization: U.S. Geological Survey - ScienceBase Contact_Address: Address_Type: mailing and physical address Address: Denver Federal Center Address: Building 810 Address: Mail Stop 302 City: Denver State_or_Province: CO Postal_Code: 80225 Contact_Voice_Telephone: 1-888-275-8747 Contact_Electronic_Mail_Address: sciencebase@usgs.gov Resource_Description: Downloadable Data. Locations and grain-size analysis results of sediment samples collected in Nantucket Sound, Massachusetts, in the vicinity of Horseshoe Shoal in May and June 2023 by the U.S. Geological Survey during field activity 2023-001-FA. This dataset contains the following files: a CSV version of the sediment laboratory analyses and a shapefile with a subset of the sediment analyses. Distribution_Liability: Unless otherwise stated, all data, metadata and related materials are considered to satisfy the quality standards relative to the purpose for which the data were collected. Although these data and associated metadata have been reviewed for accuracy and completeness and approved for release by the U.S. Geological Survey (USGS), no warranty expressed or implied is made regarding the display or utility of the data for other purposes, nor on all computer systems, nor shall the act of distribution constitute any such warranty. Any use of trade, firm, or product names is for descriptive purposes only and does not imply endorsement by the U.S. Government. Standard_Order_Process: Digital_Form: Digital_Transfer_Information: Format_Name: Comma-delimited text Format_Version_Number: Microsoft Excel 2024 Format_Specification: Comma Separated Values (CSV) text file Format_Information_Content: This dataset contains a CSV file of locations and grain-size analysis results for sediment samples collected by the U.S. Geological Survey in Nantucket Sound, Massachusetts, in the vicinity of Horseshoe Shoal in May and June 2023 by the U.S. Geological Survey during field activity 2023-001-FA. The transfer size of the CSV file is 0.026 MB. File_Decompression_Technique: Use any zip decompression software. Transfer_Size: 0.026 Digital_Transfer_Option: Online_Option: Computer_Contact_Information: Network_Address: Network_Resource_Name: https://www.sciencebase.gov/catalog/item/68badfebd4be0209bab077e0 Network_Resource_Name: https://www.sciencebase.gov/catalog/file/get/68badfebd4be0209bab077e0 Network_Resource_Name: https://doi.org/10.5066/P14NWTX8 Access_Instructions: The data can be downloaded using the Network Resource Name links. The first link is to the page containing the data, the second link downloads all data available from the page as a zip file, and the third link is to the publication landing page. Digital_Form: Digital_Transfer_Information: Format_Name: Shapefile Format_Version_Number: QGIS (version 3.34.7) Format_Specification: Esri Shapefile Format_Information_Content: This dataset contains an Esri format shapefile of locations and a subset of the grain-size analysis results for sediment samples collected by the U.S. Geological Survey in Nantucket Sound, Massachusetts, in the vicinity of Horseshoe Shoal in May and June 2023 by the U.S. Geological Survey during field activity 2023-001-FA. The transfer size of the shapefile file is 0.3 MB. File_Decompression_Technique: Use any zip decompression software. Transfer_Size: 0.3 Digital_Transfer_Option: Online_Option: Computer_Contact_Information: Network_Address: Network_Resource_Name: https://www.sciencebase.gov/catalog/item/68badfebd4be0209bab077e0 Network_Resource_Name: https://www.sciencebase.gov/catalog/file/get/68badfebd4be0209bab077e0 Network_Resource_Name: https://doi.org/10.5066/P14NWTX8 Access_Instructions: The data can be downloaded using the Network Resource Name links. The first link is to the page containing the data, the second link downloads all data available from the page as a zip file, and the third link is to the publication landing page. Fees: none Technical_Prerequisites: This dataset contains data available as a point shapefile and a CSV file. The user must have software capable of reading shapefile format to use the point shapefile. The CSV file can be read with a text editor or any software capable of viewing tabular data. Metadata_Reference_Information: Metadata_Date: 20260521 Metadata_Contact: Contact_Information: Contact_Person_Primary: Contact_Person: Seth Ackerman Contact_Organization: U.S. Geological Survey Contact_Position: Geologist Contact_Address: Address_Type: mailing and physical address Address: 384 Woods Hole Rd. City: Woods Hole State_or_Province: MA Postal_Code: 02543-1598 Country: USA Contact_Voice_Telephone: 508-548-8700 x2315 Contact_Facsimile_Telephone: 508-457-2310 Contact_Electronic_Mail_Address: whsc_data_contact@usgs.gov Contact_Instructions: The metadata contact email address is a generic address in the event the person is no longer with the USGS. Metadata_Standard_Name: Content Standard for Digital Geospatial Metadata Metadata_Standard_Version: FGDC-STD-001-1998 Metadata_Time_Convention: local time