Given what we know, we can confirm that the most probable cause for this phenomenon is thrust faulting.
This is a process fueled by plate tectonics. During thrust faulting, a fault is created and older rocks from deeper in the Earth's crust are thrust upwards, being piled atop younger rocks and leading to this exception to the principle of superposition.
Therefore, we can confirm that the most probable cause for this phenomenon is thrust faulting.
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