1. law of original horizontality Sediment gets pulled down by gravity in a horizontal and flat layer. 2. law of superposition Sediment continues to spread in a flat plane until it hits an edge or runs out of material. 3. law of original lateral continuity The youngest strata is at the top and the oldest is at the bottom. 4. law of cross-cutting or intrusive relationships If there is a fracture or intrusive feature seen in rock strata, it is younger than the rock strata.
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