Millions of years ago, ammonite swims in the ocean. , The ammonite dies and its body sinks to the ocean floor. , The soft parts of the ammonite's body start to decompose. Other animals begin to eat it. , The ammonite it buried under the sand. The soft parts of the body continue to break down, leaving the shell. , Layers of sand and mud (sediment) build up on top of the shell. The layers begin to harden. , Water containing minerals seeps into the shell, slowly turning it into rock. , The layers of rock move to the surface. Erosion exposes the fossil., The fossil is discovered! ,

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