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Date: 2015-04-17 15:11:58Fossils Sedimentary rocks Chert Petrology Micropaleontology Paleobiology Rhynie chert Archean Pseudofossil Geology Paleontology Historical geology | CrossMark_Color_flat+clickAdd to Reading ListSource URL: www.pnas.orgDownload Document from Source WebsiteFile Size: 1,53 MBShare Document on Facebook |