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Date: 2011-07-25 14:37:14Geochronology Stratigraphy Earth sciences Eonothem Changhsingian Series Global Boundary Stratotype Section and Point Erathem System Geology Historical geology Geologic time scale | Add to Reading ListSource URL: stratigraphy.orgDownload Document from Source WebsiteFile Size: 487,47 KBShare Document on Facebook |