The present geologic time scale is based on relative and numerical dating techniques.

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The present geologic time scale is constructed through a combination of relative and numerical dating techniques. Relative dating techniques allow us to determine the order in which geological events occurred, while numerical dating techniques provide us with a numerical estimate of the age of rocks and fossils. These techniques are used together to create a comprehensive timeline of Earth's history.

The Present Geologic Time Scale Is Based on Relative and Numerical