Radiometric dating resources
Most sediment is either laid down horizontally in bodies of water like the oceans, or on land on the margins of streams and rivers.Each time a new layer of sediment is deposited it is laid down horizontally on top of an older layer." First, the relative age of a fossil can be determined.
However, by itself a fossil has little meaning unless it is placed within some context.
Layers of rock are deposited horizontally at the bottom of a lake (principle of original horizontality).
Younger layers are deposited on top of older layers (principle of superposition).
The age of the fossil must be determined so it can be compared to other fossil species from the same time period.
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Understanding the ages of related fossil species helps scientists piece together the evolutionary history of a group of organisms.Second, it is possible to determine the numerical age for fossils or earth materials.
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