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: Core locations, segment depths, and estimated compaction from vibracores collected in 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/634737abd34ec63c539d22ac 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 measurements and data from two vibracores (JRBP2018-VC01A and JRBP2018-VC01B) collected from Searsville Lake, a reservoir in the Jasper Ridge Biological Preserve, Stanford, California, on October 29, 2018 (USGS Field Activity 2018-682-FA). Vibracoring introduced significant amounts of sediment compaction. The core depths in other datasets of this data release are not corrected for compaction. Translated depths are provided in this portion of the data release that return the tops of each core to the lakebed surface (0 cm). Purpose: Data presented in this portion of the data release provide core locations and depths. 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: -122.23783 North_Bounding_Coordinate: 37.40684 South_Bounding_Coordinate: 37.40683 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: core analysis 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:634737abd34ec63c539d22ac 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: No formal attribute accuracy tests were conducted Logical_Consistency_Report: No formal logical accuracy tests were conducted Completeness_Report: 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. Lineage: Process_Step: Process_Description: Cores were collected from the USGS coring platform Hadai. Water depth was measured using a reel tape measure with a weighted disc to determine the sediment surface. A handheld global satellite navigation system (GNSS) receiver was used to determine the locations of sediment samples. Lake sediment was collected in approximately 6-meter-long aluminum irrigation pipes with an outer diameter of 76.2 mm and a wall width of 1.27 mm. Pipes were coupled using aluminum sleeves, and a Honda GX160 5-horsepower 4-stroke motor drove a concrete vibrator head at approximately 167 Hz, which was clamped to the pipes. Brass-fingered core-catchers were used to prevent loss of sediment out the bottom of the pipes during extraction. Cores were segmented into 150 cm or shorter lengths. The top and bottom depths of each core segment are reported in centimeters below the lakebed. Due to significant sediment compaction while coring, the sediments originally at the lakebed surface (0 cm) were driven down to 289 cm in VC01A and 158.5 cm in VC01B. The upper sediment layers in these cores are compacted more than the sediment layers near the bottom, around 11 meters below the lakebed, thus the grains of sediment near the bottom of the core are closer to their true depths before being disturbed by coring. The core depths in the other datasets of this data release report uncorrected depths, thus the uppermost core segments start at 158.5 and 289 cm, even though the sediment at the top of these core segments represent the lakebed surface (0 cm) on October 29, 2018. Associated publications may use depths that are corrected to 0 cm at the top. The comma-separated values (csv) file in this dataset provides both the original and the corrected upper depths for each segment. Compaction percentages were calculated in the field after driving the vibracores to refusal, but before extraction, by dividing the distance from the lakebed surface to the top of the sediment in the pipe within the core by the total drive (distance below the lakebed that the core string was driven). The compaction was 15 percent and 24 percent for VC01A and VC01B, respectively. Core depths and water depths were not associated with a fixed vertical datum at the time of core collection. Cores were segmented into 150 cm (or shorter) sections in the field and split into "working" and "archive" halves in the lab. Process_Date: 20181029 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: 13 Spatial_Reference_Information: Horizontal_Coordinate_System_Definition: Geographic: Latitude_Resolution: 0.00004 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: 298.25722356 Entity_and_Attribute_Information: Detailed_Description: Entity_Type: Entity_Type_Label: searsville_core_data.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: field_activity_number Attribute_Definition: Field Activity Number Attribute_Definition_Source: Producer Defined Attribute_Domain_Values: Unrepresentable_Domain: Unique field activity number for U.S. Geological Survey field activity 2018-682-FA. Attribute: Attribute_Label: date collected Attribute_Definition: The date of core collection in mm/dd/yy format. Attribute_Definition_Source: Producer Defined Attribute_Domain_Values: Unrepresentable_Domain: Both cores were collected on the 29th of October, 2018. Attribute: Attribute_Label: core_id Attribute_Definition: Unique name for each core Attribute_Definition_Source: Producer Defined Attribute_Domain_Values: Unrepresentable_Domain: Unique name for the core in LocalityYear-CoreID format, where LocalityYear is a four-letter abbreviation of the field locality (for example JRBP = Jasper Ridge Biological Preserve) followed by the 4-digit year (2018), and CoreID is the unique name given to a core (for example VC01B is Vibracore 01 B). Attribute: Attribute_Label: segment_number Attribute_Definition: Cores were split into approximately 150 cm or shorter segments or sections to fit in scanning equipment. The segment number denotes the section of core starting from the top of the original, unsectioned core. Attribute_Definition_Source: Producer Defined Attribute_Domain_Values: Range_Domain: Range_Domain_Minimum: 1 Range_Domain_Maximum: 7 Attribute: Attribute_Label: longitude Attribute_Definition: The longitude in decimal degrees where the core was collected. Attribute_Definition_Source: Producer Defined Attribute_Domain_Values: Range_Domain: Range_Domain_Minimum: -122.23787 Range_Domain_Maximum: -122.23783 Attribute_Units_of_Measure: decimal degrees Attribute: Attribute_Label: latitude Attribute_Definition: The longitude in decimal degrees where the core was collected. Attribute_Definition_Source: Producer Defined Attribute_Domain_Values: Range_Domain: Range_Domain_Minimum: 37.40683 Range_Domain_Maximum: 37.40684 Attribute_Units_of_Measure: decimal degrees Attribute: Attribute_Label: water_depth_cm Attribute_Definition: The water depth in centimeters above the lakebed at the core collection site Attribute_Definition_Source: Producer Defined Attribute_Domain_Values: Range_Domain: Range_Domain_Minimum: 265 Range_Domain_Maximum: 268 Attribute_Units_of_Measure: centimeters Attribute: Attribute_Label: segment_upper_depth_cm Attribute_Definition: The depth below the lakebed in centimeters of the top of a core segment. Attribute_Definition_Source: Producer Defined Attribute_Domain_Values: Range_Domain: Range_Domain_Minimum: 158.5 Range_Domain_Maximum: 990.0 Attribute_Units_of_Measure: centimeters Attribute: Attribute_Label: segment_upper_depth_lakebed_cm Attribute_Definition: The depth below the lakebed in centimeters of the top of a core segment, ignoring sediment compaction and translating all core depths so the top of the uppermost core segment is at 0 centimeters. Attribute_Definition_Source: Producer Defined Attribute_Domain_Values: Range_Domain: Range_Domain_Minimum: 0 Range_Domain_Maximum: 738 Attribute_Units_of_Measure: centimeters Attribute: Attribute_Label: segment_length_cm Attribute_Definition: The length of the core segment in centimeters. Attribute_Definition_Source: Producer Defined Attribute_Domain_Values: Range_Domain: Range_Domain_Minimum: 55.5 Range_Domain_Maximum: 151 Attribute_Units_of_Measure: centimeters Attribute: Attribute_Label: core_compaction_pct Attribute_Definition: The amount of sediment compaction introduced during coring, expressed as the percentage represented by the length of sediment within the core divided by the total depth driven below the lakebed surface by the core string. Attribute_Definition_Source: Producer Defined Attribute_Domain_Values: Range_Domain: Range_Domain_Minimum: 15 Range_Domain_Maximum: 24 Attribute_Units_of_Measure: percentage 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: Core information data are available in comma-delimited text file format (JRBP2018-coredata), 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: 0.005 Digital_Transfer_Option: Online_Option: Computer_Contact_Information: Network_Address: Network_Resource_Name: https://www.sciencebase.gov/catalog/file/get/634737abd34ec63c539d22ac Network_Resource_Name: https://www.sciencebase.gov/catalog/item/634737abd34ec63c539d22ac 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 core information 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