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Date: 2007-06-28 11:50:50Chemistry Gemstones Nesosilicates Zircon Geochemistry Geochronology Jack Hills Uranium-lead dating Proxy Historical geology Geology Radiometric dating | Geochemistry Geophysics Geosystems 3Add to Reading ListSource URL: isotope.colorado.eduDownload Document from Source WebsiteFile Size: 793,59 KBShare Document on Facebook |