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This law is the important for stratigraphic dating, because fossils, bones, or other objects incorporated into these layers can be compared to each other to determine relative ages.
Those materials in the lowest layers are the oldest, while those that are in the highest levels are the youngest.
They do not provide “exact” dates for the materials.
Non-radiometric methods include dendrochronology, or tree-ring dating, amino acid dating, fission track, paleomagnetic dating, electron spin resonance, and luminescence.
Other relative methods include chemical dating, biostratigraphic or faunal dating, and cultural dating.
Chemical dating, such as fluorine dating, compares the relative amounts of absorbed fluorine in bones from the same site.
In addition, local climatic and environmental conditions determine whether fossilization will occur, so that there is differential preservation among different locations.
Moreover, the rock sequences are not always complete in all places, so certain periods cannot be investigated.
The more fossilized remains available for study, the more information can be obtained and a more complete understanding achieved.