biggest ammonite fossil marine animal fossils were found primitive seas |
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| navigate by keyword : 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 |
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| Fossils are the preserved remains of plants and animals whose bodies were buried in sediments, such as sand and mud, under ancient seas, lakes and rivers. |
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