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    • Zircon U-Pb data for volcanic ash beds in the Barstow Formation, California probe data 2022

    Metadata Updated: September 17, 2025

    Zircon grains separated from altered ash beds were analyzed to better understand the ages of beds. Isotopic analyses for U-Pb geochronology and trace element geochemistry were performed simultaneously by secondary ion mass spectrometry using the Stanford-USGS SHRIMP-RG ion microprobe housed at Stanford University, USA. Analyses followed the analytical protocol and data acquisition conditions described by Watts et al. (2016). These data are reported in this Release.

    Access & Use Information

    Public: This dataset is intended for public access and use. License: No license information was provided. If this work was prepared by an officer or employee of the United States government as part of that person's official duties it is considered a U.S. Government Work.

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    Dates

    Metadata Created Date September 12, 2025
    Metadata Updated Date September 17, 2025

    Metadata Source

    Harvested from DOI USGS DCAT-US

    Other Data Resources

    Additional Metadata

    Resource Type Dataset
    Metadata Created Date September 12, 2025
    Metadata Updated Date September 17, 2025
    Publisher U.S. Geological Survey
    Maintainer
    Identifier http://datainventory.doi.gov/id/dataset/usgs-621fd395d34ee0c6b38a866c
    Data Last Modified 2022-04-13T00:00:00Z
    Category geospatial
    Public Access Level public
    Bureau Code 010:12
    Metadata Context https://project-open-data.cio.gov/v1.1/schema/catalog.jsonld
    Metadata Catalog ID https://ddi.doi.gov/usgs-data.json
    Schema Version https://project-open-data.cio.gov/v1.1/schema
    Catalog Describedby https://project-open-data.cio.gov/v1.1/schema/catalog.json
    Harvest Object Id 5b3cd365-6881-42c4-b269-72431378e8ec
    Harvest Source Id 2b80d118-ab3a-48ba-bd93-996bbacefac2
    Harvest Source Title DOI USGS DCAT-US
    Metadata Type geospatial
    Old Spatial -117.41912841678, 34.583114835914, -116.380920409, 35.213852230377
    Source Datajson Identifier True
    Source Hash 1f9c95c230d9ebd98c2831bc7696df92568c78f44c81f03afb54434150455341
    Source Schema Version 1.1
    Spatial {"type": "Polygon", "coordinates": -117.41912841678, 34.583114835914, -117.41912841678, 35.213852230377, -116.380920409, 35.213852230377, -116.380920409, 34.583114835914, -117.41912841678, 34.583114835914}

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