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Geology Experiment – Making a Fossil


Fossils are the evidence of living things that has been preserved in rock over a long period of time.
A fossil is the remains of the living thing that can be microscopic in size.
The fossil is formed when the living plant or animal dies and is then buried in sediments. The sediments
compact and solidify overtime, the remains are contained in the rock. The fossil is discovered when the rock is
fractured and the fossil is exposed.

To demonstrate how a fossil is formed.

Plaster of Paris (Calcium Sulphate)
Small dish
Small leaf, twig or shell
Mixing bowl and spoon


  1. Add some Plaster of Paris to a mixing bowl.
    Add water until the mixture becomes thick but runny.
  2. Pour the Plaster of Paris into the small dish.
  3. Push your sample onto the surface of the Plaster of Paris.
    Don’t cover it with Plaster of Paris.
  4. Allow the Plaster of Paris to dry overnight.
  5. Gently peel off the sample from the surface of the Plaster of Paris. Discard the leaf.


Make an accurate labelled drawing of the impression of the sample in the space provided.


Write a conclusion that compares the experiment to the formation of a fossil in the space provided below.