Flash floods are limited in area, occur with little warning, are most common with intense rainfall
So they can handle the tough terrain, like rocks and dirt and gravel and harsh grounds.
They way they have an advantage of actually being able to move places
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I believe that the correct answer would be Radioactive Dating of each layer because it give a precise age based on the amount of radioactive decay the rock releases over time
I hope this helps you; please let me know
