Metadata: Identification_Information: Citation: Citation_Information: Originator: SeanPaul M. La Selle Originator: M. Allison Stegner Originator: Brandon M. Nasr Originator: Elizabeth A. Hadly Originator: Anthony D. Barnosky Originator: Brian Sherrod Publication_Date: 20230131 Title: Gamma-ray bulk density measurements of vibracore JRBP2018-VC01B from Searsville Lake, Jasper Ridge Biological Preserve, Stanford, California Geospatial_Data_Presentation_Form: comma-delimited text Series_Information: Series_Name: data release Issue_Identification: DOI:10.5066/P98CEB1B Publication_Information: Publication_Place: Pacific Coastal and Marine Science Center, Santa Cruz, California Publisher: U.S. Geological Survey Online_Linkage: https://doi.org/10.5066/P98CEB1B Online_Linkage: https://www.sciencebase.gov/catalog/item/63912297d34e0de3a1ef8377 Larger_Work_Citation: Citation_Information: Originator: SeanPaul M. La Selle Originator: M. Allison Stegner Originator: Brandon M. Nasr Originator: Elizabeth A. Hadly Originator: Anthony D. Barnosky Originator: Brian Sherrod Publication_Date: 2023 Title: Computed Tomography (CT) scans, photographs, X-ray Fluorescence (XRF) scans, grain size, and gamma-ray bulk density data of vibracores from Searsville Lake, Jasper Ridge Biological Preserve, Stanford, California Series_Information: Series_Name: data release Issue_Identification: DOI:10.5066/P98CEB1B Publication_Information: Publication_Place: Pacific Coastal and Marine Science Center, Santa Cruz, California Publisher: U.S. Geological Survey Online_Linkage: https://doi.org/10.5066/P98CEB1B Description: Abstract: This portion of the data release presents gamma-ray bulk density measurements of vibracore JRBP2018-VC01B collected from Searsville Lake, Jasper Ridge Biological Preserve, Stanford, California in October 2018 (USGS Field Activity 2018-682-FA). The gamma-ray bulk density data are provided in a comma-delimited file (.csv). Purpose: Data were obtained to characterize downcore sediment density. These data are intended for science researchers, students, policy makers, and the general public. Supplemental_Information: Additional information about the field activities from which these data were derived is available online at: https://cmgds.marine.usgs.gov/fan_info.php?fan=2018-682-FA Any use of trade, product, or firm names is for descriptive purposes only and does not imply endorsement by the U.S. Government. Time_Period_of_Content: Time_Period_Information: Range_of_Dates/Times: Beginning_Date: 20181029 Ending_Date: 20181029 Currentness_Reference: ground condition Status: Progress: Complete Maintenance_and_Update_Frequency: None planned Spatial_Domain: Bounding_Coordinates: West_Bounding_Coordinate: -122.23787 East_Bounding_Coordinate: -122.23787 North_Bounding_Coordinate: 37.40684 South_Bounding_Coordinate: 37.40684 Keywords: Theme: Theme_Keyword_Thesaurus: ISO 19115 Topic Category Theme_Keyword: geoscientificInformation Theme_Keyword: inlandWaters Theme: Theme_Keyword_Thesaurus: USGS Thesaurus Theme_Keyword: limnology Theme_Keyword: geochemistry Theme: Theme_Keyword_Thesaurus: Data Categories for Marine Planning Theme_Keyword: substrate Theme: Theme_Keyword_Thesaurus: Marine Realms Information Bank (MRIB) keywords Theme_Keyword: sediment 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: Pacific Coastal and Marine Science Center Theme_Keyword: PCMSC Theme: Theme_Keyword_Thesaurus: USGS Metadata Identifier Theme_Keyword: USGS:63912297d34e0de3a1ef8377 Place: Place_Keyword_Thesaurus: Geographic Names Information System (GNIS) Place_Keyword: Searsville Lake Place_Keyword: Jasper Ridge Place_Keyword: Stanford Place_Keyword: San Mateo County Place_Keyword: State of California Access_Constraints: None. Please see 'Distribution Info' for details. Use_Constraints: None. 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: PCMSC Science Data Coordinator Contact_Organization: U.S. Geological Survey, Pacific Coastal and Marine Science Center Contact_Address: Address_Type: mailing and physical Address: 2885 Mission Street City: Santa Cruz State_or_Province: CA Postal_Code: 95060 Contact_Voice_Telephone: 831-427-474 Contact_Electronic_Mail_Address: pcmsc_data@usgs.gov Data_Quality_Information: Attribute_Accuracy: Attribute_Accuracy_Report: Gamma-ray density measurements below 0.1 grams per cubic centimeter or missing data values were the result of poor contact with the core sample or air voids at the logging location. Anomalous values for gamma-ray bulk density were not excluded from the data. No formal attribute accuracy tests were conducted Logical_Consistency_Report: No formal logical accuracy tests were conducted Completeness_Report: Gamma-ray density measurements below 0.1 grams per cubic centimeter or missing data values were the result of poor contact with the core sample or air voids at the logging location. Anomalous values for gamma-ray bulk density were not excluded from the data. Dataset is considered complete for the information presented, as described in the abstract. Users are advised to read the rest of the metadata record carefully for additional details. Positional_Accuracy: Horizontal_Positional_Accuracy: Horizontal_Positional_Accuracy_Report: The locations of samples were determined using a Garmin etrex 30x handheld global satellite navigation system (GNSS) receiver capable of receiving wide area augmentation system (WAAS) signals. The manufacturer reported accuracy for horizontal positions is 3-5 m while receiving WAAS signals. Vertical_Positional_Accuracy: Vertical_Positional_Accuracy_Report: Core location depths and water depths were not associated with a fixed vertical datum at the time of core collection. No formal positional accuracy tests were conducted, nor were they applicable for this dataset. Lineage: Process_Step: Process_Description: Core JRBP2018-VC01B was collected on October 29, 2018. A handheld global satellite navigation system (GNSS) receiver was used to determine the locations of sediment sample. The core was segmented into 150 cm (or shorter) sections in the field. Scans of 7 unsplit core segments were obtained on a Geotek Multisensor Core Logger (MSCL) at 1-centimeter downcore intervals using a Cesium-137 gamma-ray source and gamma detector that measure gamma-ray attenuation through the core. The reference core thickness was 7.37 cm. Data are reported at the top of the sampling intervals. Density measurements were calibrated using an aluminum calibration piece mounted inside a water-filled aluminum core liner with an inside with an inside diameter of 7.37 centimeters. Gamma-ray bulk density calibration parameters were A=-0.0002 and B=-0.0577. Gamma-ray density measurements below 0.1 grams per cubic centimeter or missing data values were the result of poor contact with the core sample or air voids at the logging location. Anomalous values for gamma-ray bulk density were not excluded from the data. Process_Date: 20201006 Process_Contact: Contact_Information: Contact_Person_Primary: Contact_Person: SeanPaul La Selle Contact_Organization: U.S. Geological Survey, Pacific Coastal and Marine Science CEnter Contact_Position: Geologist Contact_Address: Address_Type: mailing and physical Address: 2885 Mission St. City: Santa Cruz State_or_Province: CA Postal_Code: 95060 Contact_Voice_Telephone: 831-460-7574 Contact_Electronic_Mail_Address: slaselle@usgs.gov Process_Step: Process_Description: corrected typo in doi number (scochran@usgs.gov) Process_Date: 20230223 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: 946 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: WGS_1984 Ellipsoid_Name: WGS_1984 Semi-major_Axis: 6378137.0 Denominator_of_Flattening_Ratio: 298.257223563 Entity_and_Attribute_Information: Detailed_Description: Entity_Type: Entity_Type_Label: JRBP2018-VC01B-gammadensity.csv Entity_Type_Definition: Comma Separated Value (CSV) file containing data. The first row is a header row. Entity_Type_Definition_Source: Producer Defined Attribute: Attribute_Label: core_depth_cm Attribute_Definition: Depth of a gamma-ray bulk density measurement (value represents the upper edge of a 1 cm interval). Depths are not corrected for core compaction and represent depth below the lakebed. Attribute_Definition_Source: Producer Defined Attribute_Domain_Values: Range_Domain: Range_Domain_Minimum: 158 Range_Domain_Maximum: 1103 Attribute_Units_of_Measure: cm Attribute_Measurement_Resolution: 1 Attribute: Attribute_Label: section_number Attribute_Definition: Core was segmented into seven, approximately 150 cm or shorter sections in order to fit in scanning equipment. The section number denotes which section of core a gamma density measurement is collected from, starting from the top of the original, unsegmented core. Attribute_Definition_Source: Producer Defined Attribute_Domain_Values: Range_Domain: Range_Domain_Minimum: 1 Range_Domain_Maximum: 7 Attribute: Attribute_Label: section_depth_cm Attribute_Definition: The depth within a core section, starting with 0 cm at the top. Attribute_Definition_Source: Producer Defined Attribute_Domain_Values: Range_Domain: Range_Domain_Minimum: 0 Range_Domain_Maximum: 152 Attribute_Units_of_Measure: cm Attribute: Attribute_Label: gamma_density_gcc Attribute_Definition: The calculated gamma-ray bulk density in grams per cubic centimeter. Attribute_Definition_Source: Producer Defined Attribute_Domain_Values: Range_Domain: Range_Domain_Minimum: 0.0556 Range_Domain_Maximum: 1.6995 Distribution_Information: Distributor: Contact_Information: Contact_Person_Primary: Contact_Person: GS ScienceBase Contact_Organization: U.S. Geological Survey 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: Gamma-ray bulk density data are available in comma-delimited text file format(JRBP2018-VC01B-gammadensity.csv), including FGDC-compliant metadata. 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. Standard_Order_Process: Digital_Form: Digital_Transfer_Information: Format_Name: comma-delimited text Format_Information_Content: comma-delimited text file File_Decompression_Technique: none Transfer_Size: 0.016 Digital_Transfer_Option: Online_Option: Computer_Contact_Information: Network_Address: Network_Resource_Name: https://www.sciencebase.gov/catalog/file/get/63912297d34e0de3a1ef8377 Network_Resource_Name: https://www.sciencebase.gov/catalog/item/63912297d34e0de3a1ef8377 Network_Resource_Name: https://doi.org/10.5066/P98CEB1B Access_Instructions: Data can be downloaded using the Network_Resource_Name links. The first link is a direct link to download a zipped file of gamma-ray density data and metadata. The second link points to a landing page where the data and metadata can be downloaded separately. The third link points to the landing page for the entire data release. Fees: None Metadata_Reference_Information: Metadata_Date: 20230223 Metadata_Contact: Contact_Information: Contact_Person_Primary: Contact_Person: PCMSC Science Data Coordinator Contact_Organization: U.S. Geological Survey, Pacific Coastal and Marine Science Center Contact_Address: Address_Type: mailing and physical Address: 2885 Mission Street City: Santa Cruz State_or_Province: CA Postal_Code: 95060 Contact_Voice_Telephone: 831-427-4747 Contact_Electronic_Mail_Address: pcmsc_data@usgs.gov Metadata_Standard_Name: Content Standard for Digital Geospatial Metadata Metadata_Standard_Version: FGDC-STD-001-1998