A fault (F) breaks three layers of sedimentary rock (S). An igneous intrusion (I1) has broken through the bottommost layer of rock. A second igneous intrusion (I2) has moved up the fault and pooled on top of the uppermost layer of rock. Which event would be considered the youngest?
Answer: The intrusion of I1 or I2 is the youngest event. Without more information, we cannot know which igneous rock is youngest.
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