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![]() Date: 2009-02-03 10:38:36Proterozoic Petroleum Glaciology Fossils Biomarker Neoproterozoic Sponge Doushantuo Formation Cryogenian Geologic time scale Historical geology Geology | Source URL: eaps.mit.eduDownload Document from Source WebsiteFile Size: 356,47 KBShare Document on Facebook |