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Each cycle comprises a woman's ovaries being stimulated to produce eggs, which are then fertilised in vitro and implanted in the womb.

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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.

There are three general approaches that allow scientists to date geological materials and answer the question: "How old is this fossil?

Most sediment is either laid down horizontally in bodies of water like the oceans, or on land on the margins of streams and rivers.

Each time a new layer of sediment is deposited it is laid down horizontally on top of an older layer.

A fossil can be studied to determine what kind of organism it represents, how the organism lived, and how it was preserved.

However, by itself a fossil has little meaning unless it is placed within some context.

Relative dating puts geologic events in chronological order without requiring that a specific numerical age be assigned to each event.Geologists have established a set of principles that can be applied to sedimentary and volcanic rocks that are exposed at the Earth's surface to determine the relative ages of geological events preserved in the rock record.For example, in the rocks exposed in the walls of the Grand Canyon (Figure 1) there are many horizontal layers, which are called strata.Layers that cut across other layers are younger than the layers they cut through (principle of cross-cutting relationships).The principle of superposition builds on the principle of original horizontality.The age of the fossil must be determined so it can be compared to other fossil species from the same time period.