{"accessLevel": "public", "bureauCode": ["010:12"], "contactPoint": {"@type": "vcard:Contact", "fn": "Christopher S Holm-Denoma", "hasEmail": "mailto:cholm-denoma@usgs.gov"}, "description": "This Laser ablation ICPMS U-Pb detrital zircon data set supports mapping and stratigraphic interpretations of the Upper Devonian Ignacio Formation in southwestern Colorado (Silverton area). All samples were collected from a measured stratigraphic section called \"Sultan Creek South\" located at 37.710010 and -107.67530 (Evans and others, 2019). The Ignacio Formation was previously interpreted as Cambrian, but evidence that it is Devonian includes reexamined fossil data and detrital zircon U-Pb geochronology. The Ignacio Formation has a stratigraphic trend of detrital zircon ages shifting from a single ca. 1.7 Ga age peak to bimodal ca. 1.4 Ga and ca. 1.7 Ga age peaks, which represents local source-area unroofing history. Specifically, the upper plate of a Proterozoic thrust system (ca. 1.7 Ga Twilight Gneiss) was eroded prior to exposure of the lower plate (ca. 1.4 Ga Uncompahgre Formation). These results are a significant alternative interpretation of the geologic history of the southern Rocky Mountains.", "distribution": [{"@type": "dcat:Distribution", "accessURL": "https://doi.org/10.5066/P9SYHGUV", "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.5d44aa89e4b01d82ce8dbe15.xml", "format": "XML", "mediaType": "text/xml", "title": "Original Metadata"}], "identifier": "http://datainventory.doi.gov/id/dataset/USGS_5d44aa89e4b01d82ce8dbe15", "keyword": ["Colorado", "Detrital Zircon", "East Lime Creek Conglomerate", "GGG", "Geochronology", "Geology, Geophysics, and Geochemistry Science Center", "Ignacio Formation", "LA-ICPMS", "Laser-Ablation Inductively-Coupled Mass Spectrometry", "Microbeam Laboratory", "Radiometric Dating", "SEM-cathodoluminescence", "San Juan Mountains", "Silverton", "Stratigraphy", "Sultan Creek", "Th", "Thorium", "U-Pb", "U.S. Geological Survey", "USGS", "USGS:5d44aa89e4b01d82ce8dbe15", "Uranium-Lead"], "modified": "2020-08-20T00:00:00Z", "publisher": {"@type": "org:Organization", "name": "U.S. Geological Survey"}, "spatial": "-107.67530, 37.710010, -107.67530, 37.710010", "theme": ["geospatial"], "title": "U-Pb detrital zircon data for: lower Paleozoic sedimentary rocks near Silverton, CO USA"}