I know that layer 3 is the youngest because of the principle of cross cutting relationships, which means the intrusion is younger than the surrounding layers. Next would be 1 because of the principle of superposition in which it is on top of all the other layers. Then would come 6 because of the same reasons. 2 would be next because it is an intrusion but stops at 6 and 4 is older than 5 because of superposition and 4 is under the layer of 5. So the order is 3,1,6,2,5,4.
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