{"accessLevel": "public", "bureauCode": ["010:12"], "contactPoint": {"@type": "vcard:Contact", "fn": "David M Miller", "hasEmail": "mailto:dmiller@usgs.gov"}, "description": "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.", "distribution": [{"@type": "dcat:Distribution", "accessURL": "https://doi.org/10.5066/P9Z3AG88", "description": "Landing page for access to the data", "format": "XML", "mediaType": "application/http", "title": "Digital Data"}, {"@type": "dcat:Distribution", "description": "The metadata original format", "downloadURL": "https://data.usgs.gov/datacatalog/metadata/USGS.621fd395d34ee0c6b38a866c.xml", "format": "XML", "mediaType": "text/xml", "title": "Original Metadata"}], "identifier": "http://datainventory.doi.gov/id/dataset/USGS_621fd395d34ee0c6b38a866c", "keyword": ["Barstow Formation", "U-Pb age", "USGS:621fd395d34ee0c6b38a866c", "radiometric dating", "tuff", "zircon"], "modified": "2022-04-13T00:00:00Z", "publisher": {"@type": "org:Organization", "name": "U.S. Geological Survey"}, "spatial": "-117.41912841678, 34.583114835914, -116.380920409, 35.213852230377", "theme": ["geospatial"], "title": "Zircon U-Pb data for volcanic ash beds in the Barstow Formation, California probe data 2022"}