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![]() Date: 2010-06-14 06:38:43Nautiloids Cephalopods Transitional fossils Orthoceras Silurian Orthocone Ordovician Hemicosmorthoceras Barrande Phanerozoic Geologic time scale Paleozoic | Source URL: palaeo-electronica.orgDownload Document from Source WebsiteFile Size: 996,67 KBShare Document on Facebook |