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You have to date the volcanic layer above and below the fossil layer.The age of the fossil will be an age range between the ages of the two volcanic layers. The diagram below shows a portion of the Geologic Time Scale. Relative age is the age of a rock layer (or the fossils it contains) compared to other layers.It can be determined by looking at the position of rock layers.Relative dating involves the dating of geological events and formations that occured/existed throughout the whole geological history, and this eventually gives the relative age of the earth.

contrast relative age dating and absolute age dating-39contrast relative age dating and absolute age dating-25contrast relative age dating and absolute age dating-71contrast relative age dating and absolute age dating-49

They use absolute dating methods, sometimes called numerical dating, to give rocks an actual date, or date range, in number of years.When ‘parent’ uranium-238 decays, for example, it produces subatomic particles, energy and ‘daughter’ lead-206.Isotopes are important to geologists because each radioactive element decays at a constant rate, which is unique to that element.Absolute age is the numeric age of a layer of rocks or fossils.Absolute age can be determined by using radiometric dating. Look at the diagram below and then answer this question: We can date the layers of volcanic ash using radiometric dating, but how can we determine the absolute age of fossil A?

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