This law allows a general age sequence to be established for layers or strata at a site or location.
Geologists often need to know the age of material that they find.
The more fossilized remains available for study, the more information can be obtained and a more complete understanding achieved.
The incomplete fossil record is due in part to lack of discovery, as only some areas are the focus of excavation and investigation.
Response: Niels Stensen created the Law of Superposition, which is the foundation for relative dating methods.
This law states that the youngest objects or layers are on the top, while the older objects and layers are deeper.
Non-radiometric methods utilize other processes to assess a date.
Non-radiometric methods include dendrochronology, or tree-ring dating, amino acid dating, fission track, paleomagnetic dating, electron spin resonance, and luminescence.
Scavenger and bacterial activity must be prevented so that decomposition is limited.
They do not provide “exact” dates for the materials.
Relative methods include stratigraphic correlation, which matches strata from different sites that are temporally comparable.
See Figure 8.13 Fluorine Dating Response: Fossils are the remains of deceased organisms that have become rock, enabling them to be preserved for thousands or millions of years.
Inorganic materials, such as iron and silica slowly and steadily replace the organic materials, like calcium and phosphorus, in the organism.
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