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Date: 2015-04-17 15:11:58 Fossils Sedimentary rocks Chert Petrology Micropaleontology Paleobiology Rhynie chert Archean Pseudofossil Geology Paleontology Historical geology		CrossMark_Color_flat+click Add to Reading List Source URL: www.pnas.org Download Document from Source Website File Size: 1,53 MB Share Document on Facebook

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