SeanPaul M. La Selle M. Allison Stegner Brandon M. Nasr Elizabeth A. Hadly Anthony D. Barnosky Brian Sherrod 20230131 comma-delimited text data release DOI:10.5066/P98CEB1B Pacific Coastal and Marine Science Center, Santa Cruz, California U.S. Geological Survey https://doi.org/10.5066/P98CEB1B https://www.sciencebase.gov/catalog/item/63912297d34e0de3a1ef8377 SeanPaul M. La Selle M. Allison Stegner Brandon M. Nasr Elizabeth A. Hadly Anthony D. Barnosky Brian Sherrod 2023 data release DOI:10.5066/P98CEB1B Pacific Coastal and Marine Science Center, Santa Cruz, California U.S. Geological Survey https://doi.org/10.5066/P98CEB1B 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). Data were obtained to characterize downcore sediment density. These data are intended for science researchers, students, policy makers, and the general public. 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. 20181029 20181029 ground condition Complete None planned -122.23787 -122.23787 37.40684 37.40684 ISO 19115 Topic Category geoscientificInformation inlandWaters USGS Thesaurus limnology geochemistry Data Categories for Marine Planning substrate Marine Realms Information Bank (MRIB) keywords sediment None U.S. Geological Survey USGS Coastal and Marine Hazards and Resources Program CMHRP Pacific Coastal and Marine Science Center PCMSC USGS Metadata Identifier USGS:63912297d34e0de3a1ef8377 Geographic Names Information System (GNIS) Searsville Lake Jasper Ridge Stanford San Mateo County State of California None. Please see 'Distribution Info' for details. None. Users are advised to read the dataset's metadata thoroughly to understand appropriate use and data limitations. PCMSC Science Data Coordinator U.S. Geological Survey, Pacific Coastal and Marine Science Center mailing and physical

2885 Mission Street

Santa Cruz CA 95060 831-427-474 pcmsc_data@usgs.gov 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 No formal logical accuracy tests were conducted 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. 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. 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. 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. 20201006 SeanPaul La Selle U.S. Geological Survey, Pacific Coastal and Marine Science CEnter Geologist mailing and physical

2885 Mission St.

Santa Cruz CA 95060 831-460-7574 slaselle@usgs.gov corrected typo in doi number (scochran@usgs.gov) 20230223 Point Point 946 0.00001 0.00001 Decimal Degrees WGS_1984 WGS_1984 6378137.0 298.257223563 JRBP2018-VC01B-gammadensity.csv Comma Separated Value (CSV) file containing data. The first row is a header row. Producer Defined core_depth_cm 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. Producer Defined 158 1103 cm 1 section_number 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. Producer Defined 1 7 section_depth_cm The depth within a core section, starting with 0 cm at the top. Producer Defined 0 152 cm gamma_density_gcc The calculated gamma-ray bulk density in grams per cubic centimeter. Producer Defined 0.0556 1.6995 GS ScienceBase U.S. Geological Survey mailing address

Denver Federal Center, Building 810, Mail Stop 302

Denver CO 80225 United States 1-888-275-8747 sciencebase@usgs.gov Gamma-ray bulk density data are available in comma-delimited text file format(JRBP2018-VC01B-gammadensity.csv), including FGDC-compliant metadata. 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. comma-delimited text comma-delimited text file none 0.016 https://www.sciencebase.gov/catalog/file/get/63912297d34e0de3a1ef8377 https://www.sciencebase.gov/catalog/item/63912297d34e0de3a1ef8377 https://doi.org/10.5066/P98CEB1B 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. None 20230223 PCMSC Science Data Coordinator U.S. Geological Survey, Pacific Coastal and Marine Science Center mailing and physical

2885 Mission Street

Santa Cruz CA 95060 831-427-4747 pcmsc_data@usgs.gov Content Standard for Digital Geospatial Metadata FGDC-STD-001-1998