Here is a closeup of banded Gneissic rock found along the Cascade Canyon trail at Grand Tetons National Park. Click the arrow on the side for a step-by-step animation of this rock’s structural history through the concept of cross-cutting relationships!
0: The rock is formed and metamorphosed.
1: (Green) Much later, it fractures and the joint (crack) fills in with quartz.
2: (Red) The rock faults with dextral (right handed) motion.
3: (Blue) The current face that we see is exposed from another fracture, which can be seen from the joint plume (blue lines) which represent the propagation of energy through the hard material.
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