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nautiloids fossils rock isolated white background ordovician period group marine cephalopods mollusca originated fusulinid permian magnifying glass extinct foraminiferans single-celled organisms modern amoebas complex shells preserved waagenophyllum coral remains plants animals bodies buried sediments sand mud ancient seas lakes rivers brachiopods leptodus carboniferous fragment stegocephalian skull triassic graptolites silurian- devonian middle cambrian staghorn biggest ammonite fossil animal primitive seas