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They are both important in terms of Earth's history and its geological timeline, and they work together in concert to build the planet's geological record.In this lesson, we're going to discuss what each type of time is and why it is important so that you too can understand how they work to describe past events on Earth. Let's start with absolute time, also called chronometric time ('chrono' means 'time' and 'metric' means 'measure').The sediment of this area was laid down after ammonite A appeared 199 million years ago, and before ammonite B became extinct 195 million years ago.This narrows the date of the delta beds to the four million years between these dates.So relative to the other meals, it falls in the middle and is later than breakfast yet earlier than dinner.

For example, 60 million years is a measure of absolute time. These are numerical representations of time, and they give us specific points of reference.

Coeditor of Proceedings of the Sixth International Conference on Radiocarbon and Tritium Dating.

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A fossil will always be younger than fossils in the beds beneath it and this is called the principle of superposition.

In an undisturbed sequence of rocks, such as in a cliff face, it is easy to get a rough idea of the ages of the individual strata – the oldest lies at the bottom and the youngest lies at the top.

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