The order is 3,1,6,2,5,4 from the youngest to the oldest. 3 is the youngest because it is an intrusion and it cuts through two layers. 1 is the second youngest because its also a intrusion but only cuts through one layer of rock.6 is the top layer so the principle of superposition making it one of the younger ones. 2 is on the second layer of rock not including the intrusions and the principle of superpostion makes it the 4th oldest. 5 is the second to last rock closest to the bottom so the principle of superpostion makes it one of the oldest rock. The oldest rock in the picture is 4 because it is at the very bottom so the principle of superpostion makes it the oldest rock out of all the others.
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