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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