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Oceanic fossils, similar to this crustacean, ammonites, and coelacanth, have been found in China and date back to 251 million years ago, much sooner than scientists expected life to rebound after a massive extinction event. Crustacean credit: Woudloper, CC BY-SA 1.0; Ammonite credit: Christian Reinboth, CC BY-SA 4.0; Coelacanth credit: Dean Falk Schnabel, CC BY-SA 4.0.