What methods are used in relative dating

Different species of ammonites lived at different times within the Mesozoic, so identifying a fossil species can help narrow down when a rock was formed.

Your goal is to study the smooth, parallel layers of rock to learn how the land built up over geologic time.

Relative dating is used to arrange geological events, and the rocks they leave behind, in a sequence.

The method of reading the order is called stratigraphy (layers of rock are called strata).

Let's look at these rock strata here: We have five layers total.

Let's say we find out, through numerical dating, that the rock layer shown above is 70 million years old.

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Geologists have studied the order in which fossils appeared and disappeared through time and rocks. Fossils can help to match rocks of the same age, even when you find those rocks a long way apart.

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