Absolute age dating definition

The principle of superposition states that in an undeformed sequence of sedimentary rocks, each layer of rock is older than the one above it and younger than the one below it (Figures 1 and 2).Accordingly, the oldest rocks in a sequence are at the bottom and the youngest rocks are at the top.However, the age of each fossil primate needs to be determined so that fossils of the same age found in different parts of the world and fossils of different ages can be compared.

As these changes have occurred, organisms have evolved, and remnants of some have been preserved as fossils.

The principle states that any geologic features that cut across strata must have formed after the rocks they cut through (Figures 2 and 3).

According to the principle of original horizontality, these strata must have been deposited horizontally and then titled vertically after they were deposited.

For example, based on the primate fossil record, scientists know that living primates evolved from fossil primates and that this evolutionary history took tens of millions of years.

By comparing fossils of different primate species, scientists can examine how features changed and how primates evolved through time.

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