When the youngest rock is not on top of the rock sequence

Today's new ELI is 'Modelling by hand ‘when the youngest rock is not on top’; illustrating how rock sequences can have older rocks on top of younger ones'

While the ‘Principle of superposition of strata’ states that younger rocks are found above older ones, there are certain unusual geological conditions causing older rocks to be found on top of younger ones. Through this activity, pupils can model the unusual geological conditions where the ‘Principle of superposition’ does not apply.
This is one of a series of activities using modelling with your hands. Many activities related to the topics in this ELI can be found on our website.