Metadata: Identification_Information: Citation: Citation_Information: Originator: Robert D. Bales Originator: Jin-Si R. Over Originator: Christopher R. Sherwood Originator: Alexander J. Olson Originator: Noa R. Randall Originator: Steven E. Suttles Publication_Date: 20240122 Title: Grain-size analysis data of sediment samples from the beach and nearshore environments at the Pea Island National Wildlife Refuge DUNEX site, North Carolina in 2021 Edition: 2.0 Geospatial_Data_Presentation_Form: vector and tabular digital data Series_Information: Series_Name: data release Issue_Identification: DOI:10.5066/P9O21FQI Publication_Information: Publication_Place: Reston, VA Publisher: U.S. Geological Survey Other_Citation_Details: Suggested citation: Bales, R.D., Over, J.R., Sherwood, C.R., Olson, A.J., Randall, N.R., and Suttles, S.E., 2024, Grain-size analysis data of sediment samples from the beach and nearshore environments at the Pea Island National Wildlife Refuge DUNEX site, North Carolina in 2021: U.S. Geological Survey data release, https://doi.org/10.5066/P9O21FQI. Online_Linkage: https://doi.org/10.5066/P9O21FQI Online_Linkage: https://www.sciencebase.gov/catalog/item/65777be2d34e952b22746288 Description: Abstract: These data provide grain-size measurements from sediment samples collected as part of the USGS DUring Nearshore Event eXperiment (DUNEX) site on Pea Island National Wildlife Refuge, NC. DUNEX is a multi-agency, academic, and non-governmental organization collaborative community experiment designed to study nearshore coastal processes during storm events. USGS participation in DUNEX will contribute new measurements and models that will increase our understanding of storm impacts to coastal environments, including hazards to humans and infrastructure and changes in landscape and natural habitats. The grain-size analysis data are part of USGS field activities 2021-028-FA and 2021-032-FA and are related to field activity 2021-029-FA. Purpose: Grain-size analysis was performed on sediment samples collected from the DUNEX site on Pea Island National Wildlife Refuge, NC in support of hydrodynamic, topographic, and bathymetric DUNEX measurements. The sediment samples were collected at or near DUNEX moorings that were installed for instruments that collected hydrodynamic data. These moorings included jetted, vertical pipes in a cross-shore array that spanned the dune/beach and nearshore environments as well as a bottom landing frame (nanopod) in the nearshore environment. These grain-size analysis data may also be used in numerical models of coastal dynamics as part of the DUNEX experiment. Supplemental_Information: For more information about the WHCMSC Field Activities, see https://cmgds.marine.usgs.gov/fan_info.php?fan=2021-028-FA and https://cmgds.marine.usgs.gov/fan_info.php?fan=2021-032-FA. Information about the DUNEX project is available at https://usgs.gov/dunex2021. Time_Period_of_Content: Time_Period_Information: Range_of_Dates/Times: Beginning_Date: 20210902 Ending_Date: 20211102 Currentness_Reference: Ground condition. Sediment samples were collected on the following dates: September 02, 2021, September 14, 2021, September 16, 2021, October 11, 2021, October 21, 2021, October 26, 2021, and November 02, 2021. Status: Progress: Complete Maintenance_and_Update_Frequency: None planned Spatial_Domain: Bounding_Coordinates: West_Bounding_Coordinate: -75.48064 East_Bounding_Coordinate: -75.46275 North_Bounding_Coordinate: 35.68073 South_Bounding_Coordinate: 35.67729 Keywords: Theme: Theme_Keyword_Thesaurus: None Theme_Keyword: U.S. Geological Survey Theme_Keyword: USGS Theme_Keyword: Coastal and Marine Hazards and Resources Theme_Keyword: CMHRP Theme_Keyword: Woods Hole Coastal and Marine Science Center Theme_Keyword: WHCMSC Theme_Keyword: During Nearshore Event Experiment Theme_Keyword: DUNEX Theme: Theme_Keyword_Thesaurus: ISO 19115 Topic Category Theme_Keyword: geoscientificInformation Theme_Keyword: oceans Theme: Theme_Keyword_Thesaurus: USGS Thesaurus Theme_Keyword: sediment transport Theme_Keyword: grab sampling Theme_Keyword: grain-size analysis Theme_Keyword: field sampling Theme: Theme_Keyword_Thesaurus: USGS Metadata Identifier Theme_Keyword: USGS:65777be2d34e952b22746288 Place: Place_Keyword_Thesaurus: Common geographic areas Place_Keyword: United States Place_Keyword: North Carolina Place_Keyword: Dare Place_Keyword: Pea Island Place_Keyword: Atlantic Ocean Access_Constraints: None. Please see "Distribution Information" for details. Use_Constraints: Public domain data from the U.S. Government are freely redistributable with proper metadata and source attribution. Please recognize the U.S. Geological Survey (USGS) as the source of this information. Point_of_Contact: Contact_Information: Contact_Person_Primary: Contact_Person: Olivia A. De Meo Contact_Organization: U.S. Geological Survey Contact_Position: Technical Information Specialist Contact_Address: Address_Type: mailing address Address: 384 Woods Hole Road City: Woods Hole State_or_Province: MA Postal_Code: 02543 Country: US Contact_Voice_Telephone: 508-548-8700 x2356 Contact_Facsimile_Telephone: 508-457-2310 Contact_Electronic_Mail_Address: odemeo@usgs.gov Browse_Graphic: Browse_Graphic_File_Name: https://www.sciencebase.gov/catalog/file/get/65777be2d34e952b22746288?name=PeaIslandDUNEXsite.JPG Browse_Graphic_File_Description: Image displaying a section of the cross-shore pipe array at the Pea Island National Wildlife Refuge DUNEX site. Browse_Graphic_File_Type: JPEG Cross_Reference: Citation_Information: Originator: Jin-Si R. Over Originator: Christopher R. Sherwood Originator: Peter A. Traykovski Originator: Alex J. Olson Originator: Noa R. Randall Originator: Eric Marsjanik Originator: Sandra M. Brosnahan Publication_Date: 2022 Title: DUNEX topographic, bathymetric, and supporting GPS data collected in Pea Island National Wildlife Refuge, North Carolina 2020-2021 Series_Information: Series_Name: data release Issue_Identification: DOI:10.5066/P9DPZZG2 Publication_Information: Publication_Place: Woods Hole Coastal and Marine Science Center, Woods Hole, MA Publisher: U.S. Geological Survey, Sciencebase Other_Citation_Details: The topobathy products in this publication are used to extract sediment sample elevations and provide additional context for the Pea Island field site. Online_Linkage: https://doi.org/10.5066/P9DPZZG2 Data_Quality_Information: Attribute_Accuracy: Attribute_Accuracy_Report: Laboratory analyses were conducted at USGS Woods Hole Coastal and Marine Science Center Sediment Laboratory using a HORIBA LA-960 laser diffraction size analyzer with manufacturer guaranteed accuracy of +/- 0.6 percent. The performance of every HORIBA LA-960 laser diffraction unit is verified with National Institute of Standards and Technology (NIST) traceable mono- and polydisperse size standards. Due to rounding, the sum of the aggregate class percentages (e.g., GRAVEL, SAND, etc.) and the sum of the phi fraction percentages (e.g., PHI_16, PHI_15, etc.) may not always add up to exactly 100.000 percent. Logical_Consistency_Report: Sediment samples were collected using a Shipek grab sampler (Shipek Grab), small metal scoop (Scoop) or by diver’s hand (Diver). Samples were shipped from the field site in a dark cooler with ice to the USGS Woods Hole Coastal and Marine Science Center. They were then stored in a refrigerated and dark location until analyzed in the laboratory on the HORIBA LA-960 laser diffraction size analyzer as described in the process steps below. Completeness_Report: This dataset represents all the samples that were collected. Some sample IDs are followed by “dup” meaning “duplicate”, for an additional sample collected at the same location. Samples ending with “(replicate)” are samples that were analyzed in the Sediment Laboratory twice to confirm HORIBA LA-960 accuracy. Positional_Accuracy: Horizontal_Positional_Accuracy: Horizontal_Positional_Accuracy_Report: Horizontal position was determined using a Garmin GPSMAP 78sc handheld GPS. The expected absolute, horizontal accuracy is stated to be 3 to 5 m at the 95 percent confidence level using the WAAS setting. Additional sources of error in the position for the water sample locations are caused by the offset from the GPS and the exact location of the Shipek grab sampler at the time the sample was taken, which could be as large as 2 m; therefore, overall expected accuracy of the reported horizontal position for these water sample locations is on the order of 7 m or better. Horizontal position for hand samples DX_20 through DX_32dup were determined with SP80 RTK systems. The SP80 RTK systems used to collect location data have a theoretical horizontal accuracy of 5 to10 cm; however, horizontal accuracy for samples DX_23 to DX_30 may be up to 0.5m because horizontal position was determined at a jetted beach pipe and hand sample was collected beside the jetted pipe. Vertical_Positional_Accuracy: Vertical_Positional_Accuracy_Report: Elevations of the sediment samples are provided in reference to NAVD88 (m). These values were extracted from topobathy grids either from 2022-09-11 or 2022-10-20 that have vertical accuracies of 0.1 m or better. DEPTH_M values were transformed from NAVD88 elevations using VDatum, decreasing the accuracy to about .12 m or better. Grids were not necessarily created from data the same day as sediment samples were collected, rather the closest grid was chosen to extract values from and some geomorphological change is to be expected, but on scales less than 1 meter. Lineage: Process_Step: Process_Description: Nanopod deployment sample collection: Collected 12 sediment samples from the R/V Shearwater using the Shipek surficial grab sampler at nanopod site in the nearshore environment off of Pea Island National Wildlife Refuge, North Carolina, in September 2021. Process_Date: 20210902 Process_Step: Process_Description: Surfzone deployment sample collection: Collected 8 sediment samples via diver at sites of jetted pipes in nearshore environment of Pea Island National Wildlife Refuge, North Carolina, in September 2021. Process_Date: 20210914 Process_Step: Process_Description: Beach sample collection: Collected 20 sediment samples via scoop at jetted pipe sites of Pea Island National Wildlife Refuge, North Carolina, in September 2021. Process_Date: 20210916 Process_Step: Process_Description: Beach sample collection: Collected 4 sediment samples at jetted pipe sites of Pea Island National Wildlife Refuge, North Carolina, in October 2021. Process_Date: 20211011 Process_Step: Process_Description: Surfzone recovery sample collection: Collected 10 sediment samples via diver at sites of jetted pipes in nearshore environment of Pea Island National Wildlife Refuge, North Carolina, in October 2021. Process_Date: 20211021 Process_Step: Process_Description: Beach sample collection: Collected 11 sediment samples via scoop at jetted pipe sites of Pea Island National Wildlife Refuge, North Carolina, in October 2021. Process_Date: 20211026 Process_Step: Process_Description: Nanopod recovery sample collection: Collected 6 sediment samples from the R/V Shearwater using the Shipek surficial grab sampler at nanopod site in the nearshore environment off of Pea Island National Wildlife Refuge, North Carolina, in November 2021. Process_Date: 20211102 Process_Step: Process_Description: The samples were analyzed in the Sediment Laboratory at the USGS Woods Hole Coastal and Marine Science Center using the HORIBA LA-960 laser diffraction unit and sieving of the ≥ -2 phi fraction. Samples submitted to the Sediment Laboratory for grain-size analysis were assigned unique analysis identifiers (ANALYSIS_ID) and divided into batches of no more than 30 samples. There were 4 batches for this sample set: batch_01, batch_02, batch_03, or batch_replicates. The batch named “batch_replicates” refers to samples that were analyzed in the Sediment Laboratory twice to confirm HORIBA LA-960 accuracy. Each batch is entered into a Microsoft Excel data entry spreadsheet (LD Worksheet Template_SS05.xlsx, where SS05 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 was also entered into macro-enabled Microsoft Excel data entry spreadsheets (GrainSizeWorksheet_LD1-30_SS05(batch_nn).xlsm or GrainSizeWorksheet_LD31-60_SS05(batch_nn).xlsm), where "LD1-30” and “LD31-60” refer to the pre-labeled and weighed glass laser diffraction vials in which the samples will be run, and “batch_nn” refers to the sample batch) to record the measurement data coming from the laser diffraction unit and incorporate the initial, dried, and sieved weights. The sample submission identifier for these samples is "SS05". About 10 to15 grams of wet sediment were placed in a pre-weighed beaker and the gross weight was recorded. The sample was wet sieved through a 4 mm (No. 5) sieve. Any remaining coarse material was oven dried at 100°C in a pre-weighed beaker and weighed again when dry. This coarse fraction was dry sieved to determine the individual weights of the -2 to -5 phi fractions, and the weights were recorded in the data entry spreadsheet LD Worksheet Template_SS05.xlsx. The fine fraction in water was collected in a pre-labeled and weighed glass laser diffraction vial. If there was any coarse fraction remaining in the sieve from wet sieving, this vial was also oven dried at 100°C and weighed when dry. If there was no coarse fraction remaining from wet sieving, the sample proceeded directly to processing for analyses by the HORIBA LA-960 laser diffraction unit. Dry, fine fractions ready for analysis by the HORIBA laser diffraction unit were rehydrated with distilled water. Fifteen (15) ml of pre-mixed 40 g/l sodium hexametaphosphate [(NaPO3)6] was added to each sample. If the height of the fluid in the laser diffraction vial was less than 5 cm, more distilled water was added to raise the level to no more than 8 cm in the vial. The samples were gently stirred, covered, and allowed to soak for at least 1 hour (for samples that were not dried) or up to 24 hours (for samples that were dried). Soaked vials were 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 appeared to be fully disaggregated, they were placed into pre-determined autosampler locations and fine fraction grain-size distributions were determined using the HORIBA LA-960 for Windows software. The fine fraction distribution data was added to the appropriate data entry spreadsheets (GrainSizeWorksheet_LD1-30_SS05(batch_nn).xlsm or GrainSizeWorksheet_LD31-60_SS05(batch_nn).xlsm). The spreadsheet was used to calculate a continuous phi class distribution from the original fractions. Process_Date: 2021 Process_Contact: Contact_Information: Contact_Person_Primary: Contact_Person: Brian Buczkowski Contact_Organization: U.S. Geological Survey Contact_Position: Physical Scientist, 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 Contact_Voice_Telephone: 508-548-8700 x2310 Contact_Electronic_Mail_Address: bbuczkowski@usgs.gov Process_Step: Process_Description: A continuous phi class distribution from the original fractions was transposed to the "results" tab in the macro-enabled Microsoft Excel data entry workbook (GrainSizeWorksheet_LD1-30_SS05(batch_nn).xlsm or GrainSizeWorksheet_LD31-60_SS05(batch_nn).xlsm, where SS05 is the identifier assigned to the sample submission, “LD1-30” and “LD31-60” refer to the pre-labeled and weighed glass laser diffraction vials in which the samples were run, and “batch_nn” refers to the sample batch). Macros in the workbook (“GS_MoM_Arithmatic,” "GS_statistics," and "sedimentname") were 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 were copied and pasted into the final Microsoft Excel spreadsheet (SS05_GS-LD_results.xlsx). The processed data were quality control checked and assigned a quality grade based on the examination of the analytical data. Processed data were released to the submitter and incorporated into the laboratory's database. All raw analytical data generated by the samples were archived in the sediment analysis laboratory. Process_Date: 2021 Process_Step: Process_Description: The results from the final Microsoft Excel spreadsheet (SS05_GS-LD_results.xlsx) were imported into Microsoft Excel for Microsoft 365 MSO 32-bit and the significant figures were adjusted appropriately. The final data was then saved as a .csv file and header names were changed in Notepad++ v8.4.1. Process_Date: 20220701 Process_Contact: Contact_Information: Contact_Person_Primary: Contact_Person: Robert D. Bales Contact_Organization: U.S. Geological Survey Contact_Position: Oceanographer Contact_Address: Address_Type: mailing and physical address Address: 11 Woods Hole Road City: Woods Hole State_or_Province: MA Postal_Code: 02540-1666 Contact_Voice_Telephone: 508-457-8700 x2257 Contact_Electronic_Mail_Address: rbales@usgs.gov Process_Step: Process_Description: Elevations of the sediment samples were extracted from topographic and bathymetric maps of the study site provided in Over and others (2022) using the maps created with data collected closest to the sample collection date. This may be up to twelve days apart, but it is not expected that the elevation values would differ by more than half a meter. Process_Date: 20220831 Process_Contact: Contact_Information: Contact_Person_Primary: Contact_Person: Jin-Si R. Over Contact_Organization: U.S Geological Survey, Woods Hole Coastal and Marine Science Center Contact_Position: Geographer Contact_Address: Address_Type: mailing and physical address Address: 384 Woods Hole Rd City: Woods Hole State_or_Province: MA Postal_Code: 02543-1598 Contact_Voice_Telephone: 508-548-8700 x2297 Contact_Electronic_Mail_Address: jover@usgs.gov Process_Step: Process_Description: Elevations (NAVD88_M) were transformed to height referenced to local mean sea level (LMSL) using VDatum Online v. 4.4.2, developed by NOAA's National Geodetic Survey (NGS). These values were calculated for DEPTH_M. Visit https://vdatum.noaa.gov/welcome.html for more information about VDatum. This process step and the following process step were performed by the same person, Robert Bales. Process_Date: 20220902 Process_Contact: Contact_Information: Contact_Person_Primary: Contact_Person: Robert D. Bales Contact_Organization: U.S. Geological Survey Contact_Position: Oceanographer Contact_Address: Address_Type: mailing and physical address Address: 11 Woods Hole Rd City: Woods Hole State_or_Province: MA Postal_Code: 02540-1666 Contact_Voice_Telephone: 508-457-8700 x2257 Contact_Electronic_Mail_Address: rbales@usgs.gov Process_Step: Process_Description: The CSV file was imported into ArcMAP 10.8.1 and a shapefile (.shp) and associated files were saved using the XY to Table function. Process_Date: 20220902 Process_Step: Process_Description: Version 2.0: Grain size data were reprocessed in September 2023 as part of a corrective action taken after an issue was identified in the Microsoft Excel data processing workbook (version 1.0) used to calculate grain size statistics and phi class distributions from raw data obtained from the Sediment Laboratory's Horiba LA-960 laser diffraction unit. Data coming from the instrument and weights recorded from sieving were not faulty. An error was found in a formula embedded in the workbook that translates data originally formatted in columns into rows. There are 96 bins of particle size distribution information recorded for each sample run on the instrument. The error resulted in a shifting of data by one bin (the values in bin number one in the column of data coming from the machine were translated into the position for bin number 2 in the corresponding row, and so on). Overall, the resulting data coming from version 1.0 of the processing workbook are affected by a slight shift in grainsize distribution. This error in the formula was corrected in September 2023 and a new version of the workbook (version 2.1) was generated and approved for use in the Sediment Laboratory. In addition, labeling for the logarithmic d10, d25, d75 and d90 headings was updated. Note the differing order of these values between Logarithmic and Arithmetic Method of Moments statistics. All affected grain size datasets using data from the laser diffraction unit have been reprocessed, reviewed, and prepared for release. Process_Date: 2023 Process_Contact: Contact_Information: Contact_Organization_Primary: Contact_Organization: U.S. Geological Survey Contact_Person: Brian Buczkowski Contact_Position: Physical Scientist, Sediment Laboratory Manager Contact_Address: Address_Type: mailing and physical address Address: Woods Hole Coastal and Marine Science Center Address: 384 Woods Hole Rd. City: Woods Hole State_or_Province: MA Postal_Code: 02543-1598 Contact_Voice_Telephone: 508-548-8700 x2361 Contact_Facsimile_Telephone: 508-457-2310 Contact_Electronic_Mail_Address: gs-wh_sedlab@usgs.gov Process_Step: Process_Description: The results from the final Microsoft Excel spreadsheet (SS05_GS-LD_results_v2.xlsx) were imported into MATLAB R2023a, the column headings were given unique names, and the significant figures were adjusted appropriately. The final data were then exported to a CSV file. A second CSV file was made to create a shapefile where negative phi values appearing in the field names were replaced with an 'M' for minus, since the shapefile cannot accommodate negative values in the field names (e.g. PHI_-1 is written as PHI_M1). This CSV file was imported into ArcGIS Pro 3.1.0 and a shapefile (.shp) and associated files were saved. Process_Date: 20231206 Process_Contact: Contact_Information: Contact_Person_Primary: Contact_Person: Olivia De Meo Contact_Organization: U.S. Geological Survey Contact_Position: Technical Information Specialist Contact_Address: Address_Type: mailing and physical address Address: 384 Woods Hole Road City: Woods Hole State_or_Province: MA Postal_Code: 02543-1598 Contact_Voice_Telephone: (508) 548-8700 x2356 Contact_Electronic_Mail_Address: odemeo@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: Point Point_and_Vector_Object_Count: 95 Spatial_Reference_Information: Horizontal_Coordinate_System_Definition: Geographic: Latitude_Resolution: 0.00001 Longitude_Resolution: 0.00001 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 Vertical_Coordinate_System_Definition: Altitude_System_Definition: Altitude_Datum_Name: North American Vertical Datum of 1988 Altitude_Resolution: 0.001 Altitude_Distance_Units: meters Altitude_Encoding_Method: Explicit elevation coordinate included with horizontal coordinates Depth_System_Definition: Depth_Datum_Name: Local Mean Sea Level Depth_Resolution: 0.001 Depth_Distance_Units: meters Depth_Encoding_Method: Explicit depth coordinate included with horizontal coordinates Entity_and_Attribute_Information: Detailed_Description: Entity_Type: Entity_Type_Label: DUNEX_GrainSize_Results_v2.csv Entity_Type_Definition: Data spreadsheet containing grain-size analysis results analyzed using the HORIBA laser diffraction unit and sieving of the ≥ -2 phi fraction. These are the attributes for the CSV file. The shapefile has two additional software-generated attributes, FID and Shape, and some modified field names that are truncated and have underscores instead of spaces and hyphens. See the entity and attribute overview section for a description of the shapefile attributes. 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 string. 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 string. 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 string. Attribute: Attribute_Label: FAN Attribute_Definition: The serial number assigned to the dataset field activity during which the sample was collected. 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 string. 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 string. 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 string. Attribute: Attribute_Label: LATITUDE Attribute_Definition: Latitude coordinate, in decimal-degrees, of sample location. South latitude is recorded as negative values. Attribute_Definition_Source: U.S. Geological Survey Attribute_Domain_Values: Range_Domain: Range_Domain_Minimum: 35.67729 Range_Domain_Maximum: 35.68073 Attribute_Units_of_Measure: Decimal degrees Attribute_Measurement_Resolution: 0.00001 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: -75.48064 Range_Domain_Maximum: -75.46275 Attribute_Units_of_Measure: Decimal degrees Attribute_Measurement_Resolution: 0.00001 Attribute: Attribute_Label: NAVD88_m Attribute_Definition: Height, in meters, of the sediment sample relative to NAVD88 (m). WKID: 5703; using positive up convention. Attribute_Definition_Source: U.S. Geological Survey Attribute_Domain_Values: Range_Domain: Range_Domain_Minimum: -13.419 Range_Domain_Maximum: 4.913 Attribute_Units_of_Measure: meters Attribute_Measurement_Resolution: 0.001 Attribute: Attribute_Label: DEPTH_m Attribute_Definition: Measured depth of water overlying sediment at sample time, in meters. Depth value is not corrected for tides. Entries with no depth indicated are left blank. Attribute_Definition_Source: U.S. Geological Survey Attribute_Domain_Values: Range_Domain: Range_Domain_Minimum: -5.02 Range_Domain_Maximum: 13.31 Attribute_Units_of_Measure: meters Attribute_Measurement_Resolution: 0.01 Attribute: Attribute_Label: T_DEPTH Attribute_Definition: Top depth of 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: 0.0 Range_Domain_Maximum: 0.0 Attribute_Units_of_Measure: centimeters Attribute_Measurement_Resolution: 0.1 Attribute: Attribute_Label: B_DEPTH Attribute_Definition: Bottom depth of 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: 2.0 Range_Domain_Maximum: 4.0 Attribute_Units_of_Measure: centimeters Attribute_Measurement_Resolution: 0.1 Attribute: Attribute_Label: DEVICE Attribute_Definition: Device used to collect the sample. Attribute_Definition_Source: U.S. Geological Survey Attribute_Domain_Values: Enumerated_Domain: Enumerated_Domain_Value: Shipek Grab Enumerated_Domain_Value_Definition: Sampling device consisting of a set of jaws and a deployment mechanism designed to collect sediments or loose substrate from the surface of the sea floor. Enumerated_Domain_Value_Definition_Source: U.S. Geological Survey Attribute_Domain_Values: Enumerated_Domain: Enumerated_Domain_Value: Scoop Enumerated_Domain_Value_Definition: Small metal scoop to collect sediments or loose substrate from the surface of the sea floor in shallow water by hand. Enumerated_Domain_Value_Definition_Source: U.S. Geological Survey Attribute_Domain_Values: Enumerated_Domain: Enumerated_Domain_Value: Diver Enumerated_Domain_Value_Definition: Hand sample collected by diver hand. 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 DD-M-YYYY where DD is the day of the month, MMM is the month abbreviation, and YYYY is the year. Attribute_Definition_Source: U.S. Geological Survey Attribute_Domain_Values: Unrepresentable_Domain: Character string. Attribute: Attribute_Label: ANALYSIS COMPLETION DATE Attribute_Definition: Calendar date indicating when sample analysis was completed in the format DD-M-YYYY where DD is the day of the month, MMM is the month abbreviation, and YYYY is the year. Attribute_Definition_Source: U.S. Geological Survey Attribute_Domain_Values: Unrepresentable_Domain: Character string. 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: 8.0488 Range_Domain_Maximum: 10.9904 Attribute_Units_of_Measure: grams Attribute_Measurement_Resolution: 0.0001 Attribute: Attribute_Label: GRAVEL 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: 0.0000 Range_Domain_Maximum: 7.4796 Attribute_Units_of_Measure: weight percent Attribute_Measurement_Resolution: 0.0001 Attribute: Attribute_Label: SAND 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: 92.4916 Range_Domain_Maximum: 100.0035 Attribute_Units_of_Measure: weight percent Attribute_Measurement_Resolution: 0.0001 Attribute: Attribute_Label: SILT 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). Attribute_Definition_Source: U.S. Geological Survey Attribute_Domain_Values: Range_Domain: Range_Domain_Minimum: 0.0000 Range_Domain_Maximum: 5.2195 Attribute_Units_of_Measure: weight percent Attribute_Measurement_Resolution: 0.0001 Attribute: Attribute_Label: CLAY 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: 0.0000 Range_Domain_Maximum: 0.3420 Attribute_Units_of_Measure: weight percent Attribute_Measurement_Resolution: 0.0001 Attribute: Attribute_Label: CLASSIFICATION Attribute_Definition: Sediment description based on a rigorous definition (Shepard [1954] as modified by Schlee and Webster [1967], Schlee [1973], and Poppe and others [2014]). These values represent the classifications that are present in this dataset, not all possible sediment classifications. Attribute_Definition_Source: Shepard, F.P., 1954, Nomenclature based on sand-silt-clay ratios: Journal of Sedimentary Petrology, v. 24, p. 151-158. Schlee, J.S., and Webster, Jacqueline, 1967, A computer program for grain-size data: Sedimentology, v. 8, p. 45-54. Schlee, J.S., 1973, Atlantic continental shelf and slope of the United States—Sediment texture of the northeastern part: U.S. Geological Survey Professional Paper 529–L, 64 p. Poppe, L.J., McMullen, K.Y., Williams, S.J., and Paskevich, V.F., eds., 2014, USGS east-coast sediment analysis: Procedures, database, and GIS data (ver. 3.0, November 2014): U.S. Geological Survey Open-File Report 2005-1001. 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: U.S. Geological Survey Attribute: Attribute_Label: MEAN_PHI Attribute_Definition: Mean value of the grain-size distribution in phi units. Attribute_Definition_Source: U.S. Geological Survey Attribute_Domain_Values: Range_Domain: Range_Domain_Minimum: 0.51 Range_Domain_Maximum: 2.80 Attribute_Units_of_Measure: phi Attribute_Measurement_Resolution: 0.01 Attribute: Attribute_Label: STDEV_PHI Attribute_Definition: Standard deviation of the grain-size distribution in phi units. Attribute_Definition_Source: U.S. Geological Survey Attribute_Domain_Values: Range_Domain: Range_Domain_Minimum: 0.58 Range_Domain_Maximum: 1.14 Attribute_Units_of_Measure: phi Attribute_Measurement_Resolution: 0.01 Attribute: Attribute_Label: SKEWNESS_PHI Attribute_Definition: Skewness (unitless deviation from symmetrical form) of the grain-size distribution calculated from phi units. Attribute_Definition_Source: U.S. Geological Survey Attribute_Domain_Values: Range_Domain: Range_Domain_Minimum: -2.66 Range_Domain_Maximum: 3.17 Attribute_Units_of_Measure: 1 Attribute_Measurement_Resolution: 0.01 Attribute: Attribute_Label: KURTOSIS_PHI Attribute_Definition: Kurtosis (unitless degree of curvature near the mode) of the grain-size distribution calculated from phi units. Attribute_Definition_Source: U.S. Geological Survey Attribute_Domain_Values: Range_Domain: Range_Domain_Minimum: 1.99 Range_Domain_Maximum: 23.59 Attribute_Units_of_Measure: 1 Attribute_Measurement_Resolution: 0.01 Attribute: Attribute_Label: D90_PHI 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: -0.88 Range_Domain_Maximum: 1.86 Attribute_Units_of_Measure: phi Attribute_Measurement_Resolution: 0.01 Attribute: Attribute_Label: D75_PHI 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: -0.17 Range_Domain_Maximum: 2.21 Attribute_Units_of_Measure: phi Attribute_Measurement_Resolution: 0.01 Attribute: Attribute_Label: D50_PHI 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: 0.50 Range_Domain_Maximum: 2.59 Attribute_Units_of_Measure: phi Attribute_Measurement_Resolution: 0.01 Attribute: Attribute_Label: D25_PHI 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: 0.87 Range_Domain_Maximum: 2.97 Attribute_Units_of_Measure: phi Attribute_Measurement_Resolution: 0.01 Attribute: Attribute_Label: D10_PHI 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: 1.42 Range_Domain_Maximum: 3.75 Attribute_Units_of_Measure: phi Attribute_Measurement_Resolution: 0.01 Attribute: Attribute_Label: MEAN_μm Attribute_Definition: Mean value of the grain-size distribution in microns. Attribute_Definition_Source: U.S. Geological Survey Attribute_Domain_Values: Range_Domain: Range_Domain_Minimum: 180.07 Range_Domain_Maximum: 952.38 Attribute_Units_of_Measure: microns Attribute_Measurement_Resolution: 0.01 Attribute: Attribute_Label: STDEV_μm Attribute_Definition: Standard deviation of the grain-size distribution in microns. Attribute_Definition_Source: U.S. Geological Survey Attribute_Domain_Values: Range_Domain: Range_Domain_Minimum: 75.80 Range_Domain_Maximum: 961.49 Attribute_Units_of_Measure: microns Attribute_Measurement_Resolution: 0.01 Attribute: Attribute_Label: SKEWNESS_μm Attribute_Definition: Skewness (unitless deviation from symmetrical form) of the grain-size distribution calculated from microns. Attribute_Definition_Source: U.S. Geological Survey Attribute_Domain_Values: Range_Domain: Range_Domain_Minimum: 0.81 Range_Domain_Maximum: 18.10 Attribute_Units_of_Measure: 1 Attribute_Measurement_Resolution: 0.01 Attribute: Attribute_Label: KURTOSIS_μm Attribute_Definition: Kurtosis (unitless degree of curvature near the mode) of the grain-size distribution calculated from microns. Attribute_Definition_Source: U.S. Geological Survey Attribute_Domain_Values: Range_Domain: Range_Domain_Minimum: 4.37 Range_Domain_Maximum: 364.34 Attribute_Units_of_Measure: 1 Attribute_Measurement_Resolution: 0.01 Attribute: Attribute_Label: D10_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: 103.04 Range_Domain_Maximum: 451.08 Attribute_Units_of_Measure: microns Attribute_Measurement_Resolution: 0.01 Attribute: Attribute_Label: D25_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: 135.84 Range_Domain_Maximum: 583.86 Attribute_Units_of_Measure: microns Attribute_Measurement_Resolution: 0.01 Attribute: Attribute_Label: D50_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: 171.29 Range_Domain_Maximum: 744.01 Attribute_Units_of_Measure: microns Attribute_Measurement_Resolution: 0.01 Attribute: Attribute_Label: D75_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: 216.44 Range_Domain_Maximum: 1112.56 Attribute_Units_of_Measure: microns Attribute_Measurement_Resolution: 0.01 Attribute: Attribute_Label: D90_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: 275.03 Range_Domain_Maximum: 1768.05 Attribute_Units_of_Measure: microns Attribute_Measurement_Resolution: 0.01 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: 0.000 Range_Domain_Maximum: 0.000 Attribute_Units_of_Measure: weight percent Attribute_Measurement_Resolution: 0.001 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, but less than 0.0000625 mm); colloid. Attribute_Definition_Source: U.S. Geological Survey Attribute_Domain_Values: Range_Domain: Range_Domain_Minimum: 0.000 Range_Domain_Maximum: 0.000 Attribute_Units_of_Measure: weight percent Attribute_Measurement_Resolution: 0.001 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, but less than 0.000125 mm); colloid. Attribute_Definition_Source: U.S. Geological Survey Attribute_Domain_Values: Range_Domain: Range_Domain_Minimum: 0.000 Range_Domain_Maximum: 0.000 Attribute_Units_of_Measure: weight percent Attribute_Measurement_Resolution: 0.001 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, but less than 0.00025 mm); fine clay. Attribute_Definition_Source: U.S. Geological Survey Attribute_Domain_Values: Range_Domain: Range_Domain_Minimum: 0.000 Range_Domain_Maximum: 0.000 Attribute_Units_of_Measure: weight percent Attribute_Measurement_Resolution: 0.001 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: 0.000 Range_Domain_Maximum: 0.000 Attribute_Units_of_Measure: weight percent Attribute_Measurement_Resolution: 0.001 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: 0.000 Range_Domain_Maximum: 0.000 Attribute_Units_of_Measure: weight percent Attribute_Measurement_Resolution: 0.001 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: 0.000 Range_Domain_Maximum: 0.000 Attribute_Units_of_Measure: weight percent Attribute_Measurement_Resolution: 0.001 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: 0.000 Range_Domain_Maximum: 0.342 Attribute_Units_of_Measure: weight percent Attribute_Measurement_Resolution: 0.001 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: 0.000 Range_Domain_Maximum: 2.380 Attribute_Units_of_Measure: weight percent Attribute_Measurement_Resolution: 0.001 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: 0.000 Range_Domain_Maximum: 2.155 Attribute_Units_of_Measure: weight percent Attribute_Measurement_Resolution: 0.001 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: 0.000 Range_Domain_Maximum: 0.390 Attribute_Units_of_Measure: weight percent Attribute_Measurement_Resolution: 0.001 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: 0.000 Range_Domain_Maximum: 0.491 Attribute_Units_of_Measure: weight percent Attribute_Measurement_Resolution: 0.001 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 0.0625 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: 0.000 Range_Domain_Maximum: 17.608 Attribute_Units_of_Measure: weight percent Attribute_Measurement_Resolution: 0.001 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: 0.855 Range_Domain_Maximum: 69.820 Attribute_Units_of_Measure: weight percent Attribute_Measurement_Resolution: 0.001 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: 11.393 Range_Domain_Maximum: 68.021 Attribute_Units_of_Measure: weight percent Attribute_Measurement_Resolution: 0.001 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: 0.232 Range_Domain_Maximum: 67.415 Attribute_Units_of_Measure: weight percent Attribute_Measurement_Resolution: 0.001 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: 0.000 Range_Domain_Maximum: 21.341 Attribute_Units_of_Measure: weight percent Attribute_Measurement_Resolution: 0.001 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: 0.000 Range_Domain_Maximum: 4.771 Attribute_Units_of_Measure: weight percent Attribute_Measurement_Resolution: 0.001 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: 0.000 Range_Domain_Maximum: 2.709 Attribute_Units_of_Measure: weight percent Attribute_Measurement_Resolution: 0.001 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: 0.000 Range_Domain_Maximum: 0.000 Attribute_Units_of_Measure: weight percent Attribute_Measurement_Resolution: 0.001 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: 0.000 Range_Domain_Maximum: 0.000 Attribute_Units_of_Measure: weight percent Attribute_Measurement_Resolution: 0.001 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: 0.000 Range_Domain_Maximum: 0.000 Attribute_Units_of_Measure: weight percent Attribute_Measurement_Resolution: 0.001 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: 0.000 Range_Domain_Maximum: 0.000 Attribute_Units_of_Measure: weight percent Attribute_Measurement_Resolution: 0.001 Attribute: Attribute_Label: ANALYST Attribute_Definition: Name (usually first, middle, and last initials) of person who performed the grain-size or physical properties analysis. BJB is Brian J Buczkowski; JDC is Jason D Chaytor; SJW is Sarah J Widlansky; SAG is Simone A Gibson. Multiple sets of initials may be indicated if more than one person worked on the analysis. Attribute_Definition_Source: U.S. Geological Survey Attribute_Domain_Values: Unrepresentable_Domain: Character string. 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 consistency between 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: Attribute_Label: QA/QC COMMENTS Attribute_Definition: Relevant comments on analytical observations or anomalies that may affect the quality of the data. Entries with no comments are left blank. Attribute_Definition_Source: U.S. Geological Survey Attribute_Domain_Values: Unrepresentable_Domain: Character string. Overview_Description: Entity_and_Attribute_Overview: These data are available in a CSV format and an Esri shapefile. The first line of the CSV file is a header line and those labels are the same as defined in the attribute section. The shapefile has the same fields as the CSV file and two additional attributes, FID (an internal feature number) and Shape (feature geometry). Please note that some of the field names in the shapefile were modified to include underscores instead of spaces and hyphens and truncated to 10 characters since a shapefile has restrictions on field name characters and length (e.g., the "DATE_COLLE" attribute in the shapefile is the same as the "DATE COLLECTED" attribute in the CSV file). Additionally, where negative phi values appear in the field name in the shapefile, they have been replaced with an 'M' for minus, since the shapefile cannot accommodate negative values in the field names (e.g. PHI_-1 is written as PHI_M1). Entity_and_Attribute_Detail_Citation: USGS Field Activities 2021-028-FA and 2021-032-FA. Distribution_Information: Distributor: Contact_Information: Contact_Organization_Primary: Contact_Organization: U.S. Geological Survey - ScienceBase Contact_Address: Address_Type: mailing address Address: Denver Federal Center, Building 810, Mail Stop 302 City: Denver State_or_Province: CO Postal_Code: 80225 Country: United States Contact_Voice_Telephone: 1-888-275-8747 Contact_Electronic_Mail_Address: sciencebase@usgs.gov Resource_Description: This dataset contains grain-size analysis of sediment samples collected from Pea Island National Wildlife Refuge, North Carolina in 2021 (DUNEX_GrainSize_Results_v2.csv and DUNEX_GrainSize_Results_v2.shp). 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. Although these data have been processed successfully on a computer system at 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. The USGS or the U.S. Government shall not be held liable for improper or incorrect use of the data described and/or contained herein. Standard_Order_Process: Digital_Form: Digital_Transfer_Information: Format_Name: CSV Format_Information_Content: Comma Separated Values (CSV) file saved from Microsoft Excel for Microsoft 365 MSO 32-bit. Transfer_Size: 0.049 Digital_Transfer_Option: Online_Option: Computer_Contact_Information: Network_Address: Network_Resource_Name: https://www.sciencebase.gov/catalog/file/get/65777be2d34e952b22746288 Network_Resource_Name: https://www.sciencebase.gov/catalog/item/65777be2d34e952b22746288 Network_Resource_Name: https://doi.org/10.5066/P9O21FQI Access_Instructions: The first link downloads all the files on the landing page. The second link is to the landing page of the data. And the third link is the DOI link which also goes to the landing page of the data. Digital_Form: Digital_Transfer_Information: Format_Name: SHP Format_Information_Content: Esri shapefile (.shp) and associated files created by importing the grain-size data into ArcGIS. The attribute headers include up to the first 10 characters from the csv file header labels. Transfer_Size: 0.407 Digital_Transfer_Option: Online_Option: Computer_Contact_Information: Network_Address: Network_Resource_Name: https://www.sciencebase.gov/catalog/file/get/65777be2d34e952b22746288 Network_Resource_Name: https://www.sciencebase.gov/catalog/item/65777be2d34e952b22746288 Network_Resource_Name: https://doi.org/10.5066/P9O21FQI Access_Instructions: The first link downloads all the files on the landing page. The second link is to the landing page of the data. The third link is the DOI link which also goes to the landing page of the data. Fees: None Metadata_Reference_Information: Metadata_Date: 20240122 Metadata_Contact: Contact_Information: Contact_Person_Primary: Contact_Person: Olivia A. De Meo Contact_Organization: U.S. Geological Survey Contact_Position: Technical Information Specialist Contact_Address: Address_Type: mailing address Address: 384 Woods Hole Road City: Woods Hole State_or_Province: MA Postal_Code: 02543 Country: US Contact_Voice_Telephone: 508-548-8700 x2356 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 USGS. Metadata_Standard_Name: FGDC Content Standard for Digital Geospatial Metadata Metadata_Standard_Version: FGDC-STD-001-1998