cretaceious |
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navigate by keyword : age ancient animal australia bone classification cretaceious darwin dating dig dinosaur era evolution evolutionary exoskeleton exploration extinct fauna finned fish fossil fossilized geological geology history holocene imprint jurassic life natural nature organism paleontology past pliocene prehistoric promecosomina radiometric ray remains science shell skeleton timeline trace triassic trilobite trout wildlife zoo zoology |
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Fossil of a ray-finned fish Promecosomina dating from Triassic period |
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