An animal is alive and swimming in the sea., The animal dies and sinks to the bottom of the sea., The soft spots of the animal rot away., The animal's bones are left on the sea floor., The skeleton of the animal is buried in the mud on the sea floor., Over a very long time, more and more mud is piled over the animal., Over a very long time, the animal's bones are replaced with stone., The animal becomes a fossil., The fossil is discovered..

3rd SCI Fossil Formation Ordering

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