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You may not associate geology with time, but the former greatly depends on the latter.

In this lesson we'll discuss both absolute and relative time, and how they work together to give us a detailed history of Earth.

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.

We have a long record of events in absolute time but much of that occurred before humans were on Earth to write it down.

The Geologic Time Scale is up there with the Periodic Table of Elements as one of those iconic, almost talismanic scientific charts.

It could also be immediately confirmed in the base office once maps and cross sections are updated and the rock units confirmed.

Wiens has a Ph D in Physics, with a minor in Geology.

His Ph D thesis was on isotope ratios in meteorites, including surface exposure dating.

Absolute dating entails laboratory analysis of rock samples that will take a longer time.

further, the dating results will still have to be cross-checked with mapping data.

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