You stare at the side of a cliff face near the sea. Suddenly, you notice a spiral outline in the rock. You have found an ammonite fossil! You are filled with awe as you think about how this shelled sea animal might have lived millions of years ago. Find out how fossils form, where they can be found and about some of the most amazing fossil discoveries. Then learn how you can find fossils too! Part of the Rock Your World series.