The property of fossils which allows scientists to determine the relative ages of rock layers is termed as Index fossils.
Index fossils are helpful because they can be used to determine the relative ages of the rock layers in which they are found.
What is index fossils?
Periods of geological time are identified using index fossils. These fossils are "frequently encountered, widely distributed fossils that are restricted in time span," according to the definition. If an index fossil is discovered in a particular layer, one can estimate the layer's age.
Index fossils are fossils used to describe and classify geologic periods, often known as guide fossils or indicator fossils (or faunal stages).
Therefore, The property of fossils which allows scientists to determine the relative ages of rock layers is termed as Index fossils.
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