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For example, JJA Worsaae used this law to prove the Three Age System.

He concluded, the bottom most layers were deposited first, thus making them the oldest and subsequent layers were progressively younger in age.As an example of how they are used, radiometric dates from geologically simple, fossiliferous Cretaceous rocks in western North America are compared to the geological time scale.To get to that point, there is also a historical discussion and description of non-radiometric dating methods.Different methods have their own limitations, especially with regard to the age range they can measure and the substances they can date.A common problem with any dating method is that a sample may be contaminated with older or younger material and give a false age.The scholar most associated with the rules of stratigraphy (or law of superposition) is probably the geologist Charles Lyell.