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1. Geological Strata

   Linked via "Tectonic Deformation"

   Law of Superposition
   The Law of Superposition posits that in an undeformed sequence of sedimentary or volcanic rocks, the oldest layers are at the bottom and the youngest layers are at the top. Exceptions to this law often involve tectonic activity, such as folding or thrust faulting, which can invert local sequences (see Tectonic Deformation).
   Principle of Original Horizontality