Youngest to Oldest:

3.

1.

6.

5.

4.

2.

I put 2,4 and 5 near at/near the bottom because I know that the oldest layers will be at the bottom. 1 and 6 are younger because they are at the top, and the young layers are at the top. The youngest is 3, because it is an intrusion and an intrusion is always the youngest.