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Oldest human(Homo sapiens) fossils are 195,000 years old and are named Omo I and Omo II, fossils found in southern Ethiopia.
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Oldest true Mammal fossils are 225 Million years old are of a tiny mouse-like creature named Adelobasileus.
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Oldest dinosaur Fossils are 245 Million years old and come from Africa - they are the upper arm and back bone from the Nyasasaurus parringtoni.
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Oldest Insect Fossils are a set of jaws from a Rhyniognatha, found in a drawer in a museum in London
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The first fossils of land plants are liverworts from Argentina and are 475 million years old.
https://steurh.home.xs4all.nl/eng/old1.html -
The oldest fish fossils are from the ocean-dwelling Metaspriggina walcotti.
http://www.sci-news.com/paleontology/science-fish-fossils-metaspriggina-walcotti-origin-jaws-01986.html -
The oldest known fossils are stromatolites; single-celled bacteria.
http://earthsky.org/earth/3-7-billion-year-old-fossils-show-early-life -
A sample of gneiss from the site of the Earth's oldest dated rocks (the Acasta River area of Canada). This sample has been dated at 4.03 billion years old.