1) An animal (such as a dinosaur, ammonite or fish) dies and falls to the bottom of the ocean. 2) The animal rots away leaving just the hardest parts – bones or shell. 3) Sediment falls and covers the remains. Sediment falls and covers the remains. Sediment falls and covers the remains.  4) Pressure forces the sediment layers together, turning them into sedimentary rock. Pressure forces the sediment layers together, turning them into sedimentary rock. Pressure forces the sediment layers together, turning them into sedimentary rock.  5) Small amounts of water come through the permeable rock and the remains are slowly washed away. 6) Left behind is an open space in the exact size and shape of the skeleton, this is called a mould. 7) The water transports tiny pieces of impermeable rock, which are left inside the mould. 8) The mould starts to fill up with these pieces of rock, in the shape of the skeleton. 9) Over time the whole skeleton, or remains, will become solid rock, called a cast. 10) After millions of years the ground underneath the cast will rise up, and weathering will wear away the rock from above. After millions of years the ground underneath the cast will rise up, and weathering will wear away the rock from above. After millions of years the ground underneath the cast will rise up, and weathering will wear away the rock from above.  11) This brings the stone cast near the surface, and people dig them up.

Fossilisation Year 6

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