5 principles of relative dating
The law of lateral continuity states that the deposition of sediment is continuous unless there is a barrier or subsequent changes in the landscape break up layers.
This can be a challenging concept to understand, but if you imagine a basin where sediment is deposited, this principle states that the sediment will be equally deposited in this area until there is no more sediment or until the sediment reaches the edge of the basin or another barrier.
Absolute dating can be helpful when there is some uncertainty about whether all features of the rock are present.
Inclusions occur where a sedimentary rock forms around a foreign object.
Smaller marine organisms are also limited in geologic time because they are often sensitive to environmental changes making them a boom-and-bust kind of organism.
That is, they become abundant, and then their sensitivity to environmental changes causes them to become extinct.
Sometimes there is evidence that an unconformity has occurred; other times, there is no way of knowing if there is a break in the relative time scale.Fossils are of special importance in relative dating because they help scientists understand the ages of certain rock formations, as well as what kinds of organisms lived together at the same time. First, the organism must be rapidly buried and remain buried over time.Next, oxygen deprivation, continued sediment accumulation, and the absence of extreme heat and pressure are needed in order to prevent the organism from being destroyed before it is fossilized.By studying relative dating, you prepare yourself to make your own insights about different kinds of ancient environments and biomes on the APES exam.Relative dating is the process of establishing a sequence of historical events and relative ages of rocks by looking at sedimentary rock formations and their features.
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Below, we will discuss some major types of fossils and why they are relevant to relative dating.