3 is the youngest because of cross-cutting relationship. After that 1 is younger than 6 because of superposition. Then 2 is after 6 because it doesn't reach the top but also because of cross-cutting relationship. Lastly, 5 is younger than 4 because of superposition. So the order from youngest to oldest is 3, 1, 6, 2, 5, and then 4.
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