Most recent to last:

Intrusion 3 because it has nothing affecting it. It looks untouched, therefore it is the last thing to happen because it isn't old enough for it to be disturbed by anything.

Layer 1 It is the layer on the very top, only being affected by Intrusion 3. It is pretty new besides Intrusion 3.

Layer 6 This is right under 1, still being affected by Intrusion 3. This is the 3rd most recent thing to happen because only 2 things have affected it.

Fault A It seems to be affected by everything above it besides the Intrusion 3. Everything below it looks like it is side ways.

Fault B Fault A happened after this one because Fault A is on top of Fault B, and so are layers 1 and 6. It is cutting Intrusion 2 so it happened right after that.

Intrusion 2 This is affected by Intrusion 3, and is near the bottom, being covered by layer 1 and 6. It was split by Fault B as well. It is a little younger than layers 5 and 4 though, because it is "intruding" them.

Layer 5 This is being affected by everything but layer 4, so it is next to last. 

Layer 4 This looks like one of the layers on the bottom. It is affected by everything, so it must have happened first, then started to get pushed and moved around.