Lipid biomarker data from Escanaba Trough sediments, off the coast of Northern California, USA, from May-June 2022.

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Frequently anticipated questions:

What does this data set describe?

Title:
Lipid biomarker data from Escanaba Trough sediments, off the coast of Northern California, USA, from May-June 2022.
Abstract:
Lipid biomarkers, including n-alkanes, polycyclic aromatic hydrocarbons (PAHs), and sterols, were measured on sediments from the Escanaba Trough, a hydrothermal spreading center off the coast of Northern CA.
Supplemental_Information:
Additional information about the field activity or activities from which these data were derived is available online at:
https:// https://cmgds.marine.usgs.gov/fan_info.php?fan=2022-621-FA
Escanaba Trough: Exploring the Seafloor and Oceanic Footprints is an interagency effort involving the National Oceanic and Atmospheric Administration, the U.S. Geological Survey, and the Bureau of Ocean Energy Management. Funding is acknowledged from NOAA Ocean Exploration via its Ocean Exploration Fiscal Year 2019 Funding Opportunity and through the National Oceanographic Partnership Program (NOPP), from the USGS Coastal and Marine Hazards and Resources Enhanced Funding Opportunities, and from the Bureau of Ocean Energy Management through Interagency Agreement M19PG00021 with the United States Geological Survey.
Any use of trade, product, or firm names is for descriptive purposes only and does not imply endorsement by the U.S. Government.
  1. How might this data set be cited?
    Ianiri, Hope L., Campbell, Pamela L., and Prouty, Nancy G., 20250218, Lipid biomarker data from Escanaba Trough sediments, off the coast of Northern California, USA, from May-June 2022.: data release DOI:10.5066/P13XVXQC, U.S. Geological Survey, Pacific Coastal and Marine Science Center, Santa Cruz, California.

    Online Links:

    This is part of the following larger work.

    Ianiri, Hope L., Prouty, Nancy G., Campbell, Pamela L., Gartman, Amy, Adamczyk, Katlin B., and Favela, Jaycee J., 2025, Sedimentary organic geochemistry data from Escanaba Trough, off the coast of northern California, collected May-June 2022.: data release DOI:10.5066/P13XVXQC, U.S. Geological Survey, Pacific Coastal and Marine Science Center, Santa Cruz, CA.

    Online Links:

    Other_Citation_Details:
    Suggested Citation: Ianiri, H.L., Prouty, N.G., Campbell, P.L., Gartman, A., Adamczyk, K.B., and Favela, J.J., 2025, Sedimentary organic geochemistry data from Escanaba Trough, off the coast of northern California, collected May-June 2022: U.S. Geological Survey data release, https://doi.org/10.5066/P13XVXQC.
  2. What geographic area does the data set cover?
    West_Bounding_Coordinate: -127.53618710
    East_Bounding_Coordinate: -127.44714953
    North_Bounding_Coordinate: 41.08222461
    South_Bounding_Coordinate: 40.69569198
  3. What does it look like?
  4. Does the data set describe conditions during a particular time period?
    Beginning_Date: 31-May-2022
    Ending_Date: 11-Jun-2022
    Currentness_Reference:
    Ground condition at time data were collected.
  5. What is the general form of this data set?
    Geospatial_Data_Presentation_Form: comma-delimited text
  6. How does the data set represent geographic features?
    1. How are geographic features stored in the data set?
      This is a point data set. It contains the following vector data types (SDTS terminology):
      • point (12)
    2. What coordinate system is used to represent geographic features?
      Horizontal positions are specified in geographic coordinates, that is, latitude and longitude. Latitudes are given to the nearest 0.00000001. Longitudes are given to the nearest 0.0000001. Latitude and longitude values are specified in Decimal degrees. The horizontal datum used is D_WGS_1984.
      The ellipsoid used is WGS84.
      The semi-major axis of the ellipsoid used is 6378137.0000.
      The flattening of the ellipsoid used is 1/298.2572.
  7. How does the data set describe geographic features?
    EscanabaTrough_lipids.csv
    Table of lipid biomarker data. (Source: producer defined)
    Cruise_ID
    Lists the alphanumeric cruise identifier for the expedition during which the sample was collected. (Source: producer defined)
    ValueDefinition
    TN403Cruise identification affiliated with Field Activity 2022-621-FA
    Sample_ID
    Name of sample (Source: producer defined) The sample names include a dive number (J2, denoting Jason2, followed by a number), push core number (PC, denoting push core, followed by a number) and the sediment depth horizon (X-Y).
    Latitude
    Latitude of sample in decimal degrees (Source: producer defined)
    Range of values
    Minimum:40.69572818
    Maximum:41.08224004
    Units:decimal degrees
    Resolution:0.00000001
    Longitude
    Longitude of sample in decimal degrees (Source: producer defined)
    Range of values
    Minimum:-127.5282233
    Maximum:-127.4470967
    Units:decimal degrees
    Resolution:0.0000001
    Water_depth_m
    Water depth in meters at which the sample was collected. (Source: producer defined)
    Range of values
    Minimum:3223
    Maximum:3235
    Units:meters
    Resolution:1
    Location
    Location where the sample was collected (Source: producer defined)
    ValueDefinition
    Central HillText descriptor of sampling site as defined in the literature
    Edifice Rex EastText descriptor of sampling site as defined in the literature
    SESCA S3AText descriptor of sampling site as defined in the literature
    sediment_depth_top_cm
    top depth of core subsample. Ex: a sediment core slice from 0-1 cm would have a top depth of 0 centimeters and a bottom depth of 1 centimeter. (Source: producer defined)
    Range of values
    Minimum:0
    Maximum:18
    Units:centimeters
    Resolution:1
    sediment_depth_bottom_cm
    bottom depth of core subsample. Ex: a sediment core slice from 0-1 cm would have a top depth of 0 centimeters and a bottom depth of 1 centimeter. (Source: producer defined)
    Range of values
    Minimum:1
    Maximum:20
    Units:centimeters
    Resolution:1
    C15_nalkane_ug_gOC
    Concentration of pentadecane (C15 n-alkane). -9999 indicates peak below detection limit. (Source: producer defined)
    Range of values
    Minimum:0.5
    Maximum:25.5
    Units:micrograms per gram organic carbon.
    Resolution:0.1
    C16_nalkane_ug_gOC
    Concentration of hexadecane (C16 n-alkane). -9999 indicates peak below detection limit. (Source: producer defined)
    Range of values
    Minimum:0.6
    Maximum:53.2
    Units:micrograms per gram organic carbon.
    Resolution:0.1
    C17_nalkane_ug_gOC
    Concentration of heptadecane (C17 n-alkane). (Source: producer defined)
    Range of values
    Minimum:0.9
    Maximum:88.6
    Units:micrograms per gram organic carbon.
    Resolution:0.1
    C18_nalkane_ug_gOC
    Concentration of octadecane (C18 n-alkane). (Source: producer defined)
    Range of values
    Minimum:1.6
    Maximum:106.8
    Units:micrograms per gram organic carbon.
    Resolution:0.1
    C19_nalkane_ug_gOC
    Concentration of nonadecane (C19 n-alkane). (Source: producer defined)
    Range of values
    Minimum:2.3
    Maximum:116.3
    Units:micrograms per gram organic carbon.
    Resolution:0.1
    C20_nalkane_ug_gOC
    Concentration of eicosane (C20 n-alkane). (Source: producer defined)
    Range of values
    Minimum:3.4
    Maximum:149.3
    Units:micrograms per gram organic carbon.
    Resolution:0.1
    C21_nalkane_ug_gOC
    Concentration of heneicosane (C21 n-alkane). (Source: producer defined)
    Range of values
    Minimum:4.1
    Maximum:150.8
    Units:micrograms per gram organic carbon.
    Resolution:0.1
    C22_nalkane_ug_gOC
    Concentration of docosane (C22 n-alkane). (Source: producer defined)
    Range of values
    Minimum:4.9
    Maximum:183.1
    Units:micrograms per gram organic carbon.
    Resolution:0.1
    C23_nalkane_ug_gOC
    Concentration of tricosane (C23 n-alkane). (Source: producer defined)
    Range of values
    Minimum:5.4
    Maximum:168.4
    Units:micrograms per gram organic carbon.
    Resolution:0.1
    C24_nalkane_ug_gOC
    Concentration of tetracosane (C24 n-alkane). (Source: producer defined)
    Range of values
    Minimum:4.9
    Maximum:199.8
    Units:micrograms per gram organic carbon.
    Resolution:0.1
    C25_nalkane_ug_gOC
    Concentration of pentacosane (C25 n-alkane). (Source: producer defined)
    Range of values
    Minimum:6.1
    Maximum:157.8
    Units:micrograms per gram organic carbon.
    Resolution:0.01
    C26_nalkane_ug_gOC
    Concentration of hexacosane (C26 n-alkane). (Source: producer defined)
    Range of values
    Minimum:5.6
    Maximum:184.5
    Units:micrograms per gram organic carbon.
    Resolution:0.01
    C27_nalkane_ug_gOC
    Concentration of heptacosane (C27 n-alkane). (Source: producer defined)
    Range of values
    Minimum:7.9
    Maximum:177.7
    Units:micrograms per gram organic carbon.
    Resolution:0.1
    C28_nalkane_ug_gOC
    Concentration of octacosane (C28 n-alkane). (Source: producer defined)
    Range of values
    Minimum:5.5
    Maximum:200.4
    Units:micrograms per gram organic carbon.
    Resolution:0.1
    C29_nalkane_ug_gOC
    Concentration of nonacosane (C29 n-alkane). (Source: producer defined)
    Range of values
    Minimum:9.6
    Maximum:199.3
    Units:micrograms per gram organic carbon.
    Resolution:0.1
    C30_nalkane_ug_gOC
    Concentration of triacontane (C30 n-alkane). (Source: producer defined)
    Range of values
    Minimum:4.4
    Maximum:252.1
    Units:micrograms per gram organic carbon.
    Resolution:0.1
    C31_nalkane_ug_gOC
    Concentration of hentriacontane (C31 n-alkane). (Source: producer defined)
    Range of values
    Minimum:7.2
    Maximum:228.8
    Units:micrograms per gram organic carbon.
    Resolution:0.1
    C32_nalkane_ug_gOC
    Concentration of dotriacontane (C32 n-alkane). (Source: producer defined)
    Range of values
    Minimum:2.6
    Maximum:224.8
    Units:micrograms per gram organic carbon.
    Resolution:0.1
    C33_nalkane_ug_gOC
    Concentration of tritriacontane (C33 n-alkane). (Source: producer defined)
    Range of values
    Minimum:6.9
    Maximum:197.5
    Units:micrograms per gram organic carbon.
    Resolution:0.1
    C34_nalkane_ug_gOC
    Concentration of tetratriacontane (C34 n-alkane). (Source: producer defined)
    Range of values
    Minimum:2.7
    Maximum:181.4
    Units:micrograms per gram organic carbon.
    Resolution:0.1
    C35_nalkane_ug_gOC
    Concentration of pentatriacontane (C35 n-alkane). (Source: producer defined)
    Range of values
    Minimum:1.6
    Maximum:108.0
    Units:micrograms per gram organic carbon.
    Resolution:0.1
    C36_nalkane_ug_gOC
    Concentration of hexatriacontane (C36 n-alkane). -9999 indicates peak below detection limit. (Source: producer defined)
    Range of values
    Minimum:1.4
    Maximum:169.7
    Units:micrograms per gram organic carbon.
    Resolution:0.1
    C37_nalkane_ug_gOC
    Concentration of heptatriacontane (C37 n-alkane). -9999 indicates peak below detection limit. (Source: producer defined)
    Range of values
    Minimum:2.1
    Maximum:238.1
    Units:micrograms per gram organic carbon.
    Resolution:0.1
    phytane_ug_gOC
    Concentration of phytane. (Source: producer defined)
    Range of values
    Minimum:0.8
    Maximum:90.4
    Units:micrograms per gram organic carbon.
    Resolution:0.1
    pristane_ug_gOC
    Concentration of pristane. (Source: producer defined)
    Range of values
    Minimum:1.0
    Maximum:81.8
    Units:micrograms per gram organic carbon.
    Resolution:0.1
    anthracene_ug_gOC
    Concentration of anthracene. -9999 indicates peak below detection limit. (Source: producer defined)
    Range of values
    Minimum:1.5
    Maximum:3.4
    Units:micrograms per gram organic carbon.
    Resolution:0.1
    benz(a)anthracene_ug_gOC
    Concentration of benz(a)anthracene. -9999 indicates peak below detection limit. (Source: producer defined)
    Range of values
    Minimum:3.8
    Maximum:395.9
    Units:micrograms per gram organic carbon.
    Resolution:0.1
    benzo(a)pyrene_ug_gOC
    Concentration of benzo(a)pyrene. -9999 indicates peak below detection limit. (Source: producer defined)
    Range of values
    Minimum:6.1
    Maximum:288.5
    Units:micrograms per gram organic carbon.
    Resolution:0.1
    benzo(b)fluoranthene_ug_gOC
    Concentration of benzo(b)fluoranthene. -9999 indicates peak below detection limit. (Source: producer defined)
    Range of values
    Minimum:1.9
    Maximum:153.7
    Units:micrograms per gram organic carbon.
    Resolution:0.1
    benzo(g,h,i)perylene_ug_gOC
    Concentration of benzo(g,h,i)perylene. (Source: producer defined)
    Range of values
    Minimum:6.2
    Maximum:1888.9
    Units:micrograms per gram organic carbon.
    Resolution:0.1
    benzo(k)fluoranthene_ug_gOC
    Concentration of benzo(k)fluoranthene. (Source: producer defined)
    Range of values
    Minimum:5.8
    Maximum:924.6
    Units:micrograms per gram organic carbon.
    Resolution:0.1
    chrysene_ug_gOC
    Concentration of chrysene. -9999 indicates peak below detection limit. (Source: producer defined)
    Range of values
    Minimum:2.2
    Maximum:6.0
    Units:micrograms per gram organic carbon.
    Resolution:0.1
    dibenz(a,h)anthracene_ug_gOC
    Concentration of dibenz(a,h)anthracene. -9999 indicates peak below detection limit. (Source: producer defined)
    Range of values
    Minimum:6.6
    Maximum:9.2
    Units:micrograms per gram organic carbon.
    Resolution:0.1
    fluoranthrene_ug_gOC
    Concentration of fluoranthrene. -9999 indicates peak below detection limit. (Source: producer defined)
    Range of values
    Minimum:2.9
    Maximum:373.1
    Units:micrograms per gram organic carbon.
    Resolution:0.1
    fluorene_ug_gOC
    Concentration of fluorene. -9999 indicates peak below detection limit. (Source: producer defined)
    Range of values
    Minimum:2.9
    Maximum:119.6
    Units:micrograms per gram organic carbon.
    Resolution:0.1
    indeno(1,2,3-c,d)pyrene_ug_gOC
    Concentration of indeno(1,2,3-c,d)pyrene. (Source: producer defined)
    Range of values
    Minimum:6.2
    Maximum:968.0
    Units:micrograms per gram organic carbon.
    Resolution:0.1
    naphthalene_ug_gOC
    Concentration of naphthalene. -9999 indicates peak below detection limit. (Source: producer defined)
    Range of values
    Minimum:-9999
    Maximum:-9999
    Units:micrograms per gram organic carbon.
    phenanthrene_ug_gOC
    Concentration of phenanthrene. (Source: producer defined)
    Range of values
    Minimum:3.9
    Maximum:589.8
    Units:micrograms per gram organic carbon.
    Resolution:0.1
    pyrene_ug_gOC
    Concentration of pyrene. (Source: producer defined)
    Range of values
    Minimum:4.3
    Maximum:2591.3
    Units:micrograms per gram organic carbon.
    Resolution:0.1
    cholesterol_ug_gOC
    Concentration of cholesterol. (Source: producer defined)
    Range of values
    Minimum:3.0
    Maximum:120.3
    Units:micrograms per gram organic carbon.
    Resolution:0.1
    brassicasterol_ug_gOC
    Concentration of brassicasterol. -9999 indicates peak below detection limit. (Source: producer defined)
    Range of values
    Minimum:0.2
    Maximum:5.0
    Units:micrograms per gram organic carbon.
    Resolution:0.1
    campesterol_ug_gOC
    Concentration of campesterol. -9999 indicates peak below detection limit. (Source: producer defined)
    Range of values
    Minimum:0.4
    Maximum:3.0
    Units:micrograms per gram organic carbon.
    Resolution:0.1
    stigmasterol_ug_gOC
    Concentration of stigmasterol. -9999 indicates peak below detection limit. (Source: producer defined)
    Range of values
    Minimum:0.3
    Maximum:4.1
    Units:micrograms per gram organic carbon.
    Resolution:0.1
    beta-sitosterol_ug_gOC
    Concentration of beta-sitosterol. (Source: producer defined)
    Range of values
    Minimum:0.8
    Maximum:6.4
    Units:micrograms per gram organic carbon.
    Resolution:0.1
    Entity_and_Attribute_Overview: The first line of the csv file is a header line.
    Entity_and_Attribute_Detail_Citation: U.S. Geological Survey

Who produced the data set?

  1. Who are the originators of the data set? (may include formal authors, digital compilers, and editors)
    • Hope L. Ianiri
    • Pamela L. Campbell
    • Nancy G. Prouty
  2. Who also contributed to the data set?
  3. To whom should users address questions about the data?
    U.S. Geological Survey, Pacific Coastal and Marine Science Center
    Attn: PCMSC Science Data Coordinator
    2885 Mission Street
    Santa Cruz, CA

    831-427-4747 (voice)
    pcmsc_data@usgs.gov

Why was the data set created?

Data were obtained to assess organic carbon storage, reactivity, and cycling within sediments of the Escanaba Trough, a hydrothermal spreading center which contains critical minerals. This work aids our understanding of the geochemistry of marine mineral host sediments and hydrothermal vent processes throughout the global ocean.

How was the data set created?

  1. From what previous works were the data drawn?
  2. How were the data generated, processed, and modified?
    Date: 11-Jun-2022 (process 1 of 2)
    SEDIMENT COLLECTION. Samples were collected aboard the R/V Thomas Thompson via push coring using the ROV Jason. Once recovered shipboard, pore waters were extracted via rhizon samplers, cores were subsectioned into one to five cm slices, the exterior sediment which was in contact with the core liner was removed, and remaining sediment was stored frozen in pre-combusted glass jars.
    Date: 25-May-2023 (process 2 of 2)
    SEDIMENT BIOMARKER CONCENTRATIONS (N-ALKANES, PAHS AND STEROLS): The biomarker composition of sediment samples was determined by gas chromatography-mass spectrometry (GC MS) at the USGS Organic Geochemistry laboratory in Santa Cruz, California. The samples were extracted using a modified version of the method presented in Bligh and Dyer (1959). Two bed volumes of hexanes were added to each sample and samples were mixed, sonicated for 15 minutes (min), then centrifuged for five min at 2000 revolutions per min. The supernatant was piped to a combusted Turbovap flask. This process was repeated two more times with hexanes and three times with 9:1 DCM:MeOH, combining the supernatant from each sample. Prior to extraction, internal standards were added (5-alpha-androstane and 5-alpha-androstan-3-beta-ol). The lipid extracts were passed though glass funnels containing sodium sulfate to remove excess water, followed by separation into compound classes by silica gel column chromatography (silica gel 60) as described in Prouty and others (2020). The following fractions were eluted: F1: alkanes (100 percent hexane eluant); F2: polycyclic aromatic hydrocarbons (PAHs) (50 percent hexane, 50 percent toluene eluant); F3a: alcohols and sterols (20 percent ethyl acetate, 80 percent hexane eluant); F3b: fatty acids and glycosidic polar lipids (40 percent ethyl acetate, 60 percent hexane); F4: phosphatic polar lipids (100 percent methanol eluant). F3a was converted to trimethylsiloxyl derivatives by addition of bis (trimethylsilyl) trifluoroacetamide (BSTFA with 10 percent TMCS) and pyridine, then heated at 70 degrees Celsius for 1 h prior to GC MS analysis. Extracts were analyzed by splitless injection onto an Agilent 8890 gas chromatograph interfaced to an Agilent 7000D triple quad mass spectrometer. To measure n-alkanes, the gas chromatograph oven program began at 90 degrees Celsius for 5 min, increased to 240 degrees Celsius at a rate of 4 degrees Celsius/min, held for 5 min, then increased to a final temperature of 300 degrees Celsius at a rate of 10 degrees Celsius/min and held for 18 min. To measure PAHs, the oven program begam at 90 degrees Celsius, held for 5 min, increased to 240 degrees Celsius at a rate of 8 degrees Celsius/min, held for 5 min, then increased to a final temperature of 300 degrees Celsius at a rate of 8 degrees Celsius/min which was held for 18 min. To measure sterols, the oven program began at 100 degrees Celsius, held for 4 min, and increased to a final temperature of 315 degrees Celsius at 4 degrees Celsius/min, which was held for 5 min. The capillary column (Agilent DB-5MS: 30 m length x 0.25 mm interior diameter with a 0.025 micron phase thickness) was directly interfaced to the ion source of the mass spectrometer. Hexane instrument blanks, extraction blanks, and procedural sample duplicates were run and analyzed every 10 samples. Compound identification was through individual standard spectra, published reference spectra, and by relative retention times/elution order. Concentrations of individual lipids were determined based on peak area in relation to internal and external standards.
  3. What similar or related data should the user be aware of?
    Ianiri, Hope L., Campbell, Pamela L., Gartman, Amy, and Prouty, Nancy G., 2025, Characterizing sedimentary organic carbon in a hydrothermal spreading center, the Escanaba Trough.

    Online Links:

    Other_Citation_Details:
    Ianiri, H.L., Campbell, P., Gartman, A., and Prouty, N.G., 2025, Characterizing sedimentary organic carbon in a hydrothermal spreading center, the Escanaba Trough: Chemical Geology, https://doi.org/10.1016/j.chemgeo.2025.122679.
    Morton, J. L., Zierenberg, Robert A., and Reiss, Carol A., 1994, Geologic, hydrothermal, and biologic studies at Escanaba Trough, Gorda Ridge, offshore northern California.

    Online Links:

    Other_Citation_Details:
    Morton, J.L., Zierenberg, R.A., Reiss, C.A., 1994. Geologic, hydrothermal, and biologic studies at Escanaba Trough: an introduction, in: Geologic, Hydrothermal, and Biologic Studies at Escanaba Trough, Gorda Ridge, Offshore Northern California. U.S. Geological Survey.
    Clague, David. A., Zierenberg, Robert A., Paduan, Jennifer B., Caress, David W., Cousens, Brian L., Dreyer, Brian M., Davis, Alice S., McClain, James, and Ross, Stephanie L., 2022, Emplacement and impacts of lava flows and intrusions on the sediment-buried Escanaba Segment of the Gorda mid-ocean ridge.

    Online Links:

    Other_Citation_Details:
    Clague, D.A., Zierenberg, R.A., Paduan, J.B., Caress, D.W., Cousens, B.L., Dreyer, B.M., Davis, A.S., McClain, J., Ross, S.L., 2022. Emplacement and impacts of lava flows and intrusions on the sediment-buried Escanaba Segment of the Gorda mid-ocean ridge. Journal of Volcanology and Geothermal Research 432, 107701.
    Bligh, E. G., and Dyer, E. J., 1959, A rapid method of total lipid extraction and purification.

    Online Links:

    Other_Citation_Details:
    Bligh E. G., Dyer E. J., 1959. A rapid method of total lipid extraction and purification. Canadian Journal of Biochemistry and Physiology, 37 (8).
    Prouty, Nancy G., Campbell, Pamela L., Close, Hilary G., Biddle, Jennifer F., and Beckmann, Sabrina, 2020, Molecular indicators of methane metabolisms at cold seeps along the United States Atlantic Margin.

    Online Links:

    Other_Citation_Details:
    Prouty N. G., Campbell P. L., Close H. G., Biddle J. F., Beckmann S., 2020. Molecular indicators of methane metabolisms at cold seeps along the United States Atlantic Margin. Chemical Geology, 543, 119603.

How reliable are the data; what problems remain in the data set?

  1. How well have the observations been checked?
    Surrogate standards and an internal standard were used for validation, recoveries, and quantification of biomarker concentrations.
  2. How accurate are the geographic locations?
    The horizontal accuracy for each sample was obtained from the ROV's Ultra Short Baseline Positioning System (USBL) navigation after calibration to the CASIUS (Calibration of Attitude Sensors In USBL Systems) calibration system. Accuracy for this depth is approximately 10- 20 m.
  3. How accurate are the heights or depths?
    The vertical accuracy was determined using multiple DVLs (Doppler Velocity Loggers) on the ROV, which are accurate to less than 1 m.
  4. Where are the gaps in the data? What is missing?
    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.
  5. How consistent are the relationships among the observations, including topology?
    No formal logical accuracy tests were conducted.

How can someone get a copy of the data set?

Are there legal restrictions on access or use of the data?
Access_Constraints No access constraints
Use_Constraints USGS-authored or produced data and information are in the public domain from the U.S. Government and are freely redistributable with proper metadata and source attribution. Please recognize and acknowledge the U.S. Geological Survey as the originator(s) of the dataset and in products derived from these data.
  1. Who distributes the data set? (Distributor 1 of 1)
    U.S. Geological Survey - ScienceBase
    Denver Federal Center, Building 810, Mail Stop 302
    Denver, CO

    1-888-275-8747 (voice)
    sciencebase@usgs.gov
  2. What's the catalog number I need to order this data set? These data are available in a single csv file (EscanabaTrough_lipids.csv).
  3. What legal disclaimers am I supposed to read?
    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 on any other system or for general or scientific purposes, nor shall the act of distribution constitute any such warranty.
  4. How can I download or order the data?
  5. What hardware or software do I need in order to use the data set?
    These data can be viewed with Microsoft Excel or any text reading software.

Who wrote the metadata?

Dates:
Last modified: 18-Feb-2025
Metadata author:
U.S. Geological Survey, Pacific Coastal and Marine Science Center
Attn: PCMSC Science Data Coordinator
2885 Mission Street
Santa Cruz, CA

831-427-4747 (voice)
pcmsc_data@usgs.gov
Metadata standard:
Content Standard for Digital Geospatial Metadata (FGDC-STD-001-1998)
This page is <https://cmgds.marine.usgs.gov/catalog/pcmsc/DataReleases/ScienceBase/DR_P13XVXQC/EscanabaTrough_lipids.faq.html>
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