How are relative and absolute dating methods used to determine the age of rocks and fossils?
Answers
Answer:
Relative dating is used to determine a fossils approximate age by comparing it to similar rocks and fossils of known ages. Absolute dating is used to determine a precise age of a fossil by using radiometric dating to measure the decay of isotopes, either within the fossil or more often the rocks associated with it.
Explanation:
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By contrasting a fossil with comparable rocks and fossils of known ages, relative dating is performed to establish the approximate age of the fossil. By measuring the decay of isotopes within the fossil or, more frequently, the rocks associated with it, radiometric dating is used to estimate an exact/absolute age of a fossil.
What is Relative Dating ?
Relative dating techniques are typically used to date fossils. Relative dating compares the fossil to an object whose age is already established. Scientists can help with relative dating by using correlation to identify certain types of fossils known as indicator fossils. Index fossils are those that have been determined to have only existed within a fairly specific age range. It is typically preferable to employ fossils with a wide geographic distribution as index fossils, such as brachiopods, trilobites, and ammonites. The fossil you are attempting to date must fall within the age range of the index fossil if it is found next to one of these index fossils.
What is Absolute Dating ?
Absolute dating methods can be used to determine a rock's or fossil's exact age. Using radioactive elements present in rocks and fossils, this performs almost like a geological clock. It is frequently more easier to date volcanic rocks than fossils or the sedimentary layers they are found in. Volcanic rocks layers typically found above and below them can be used to date the layers containing fossils.
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