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Law of superposition: This is one of the most basic techniques of relative dating geologists use.

This principle says that the oldest rock layer is always on the bottom and layers above it get progressively younger.

This is because the rocks were deposited laterally in continuous flat layers and can be covered with vegetation or eroded in some places.

The only exception is instead of rock layers we're focusing on fossils.However, it does not cut layers D and E, so those layers are younger than Fault F.Law of inclusions: This law states that when a rock contains pieces or fragments (also called inclusions) of another rock, these pieces or fragments must be older.So, basically it's the difference between saying 'I'm 25 years old, and my sibling is 20 years old' and 'I'm older than my sibling.' Geologists use a variety of techniques, or principles, to determine the relative age of a rock unit.Principle of original horizontality: This principle simply states that deposition of rocks occurs horizontally or nearly horizontally. Most deposition occurs as the ocean deposits sediment flat and horizontally on existing rock, either on the ocean floor or on the continent.

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