The geologic time scale was devised before the techniques for numerical dating using radioactivity were developed.

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The geologic time scale was first developed in the 19th century based on relative dating techniques such as stratigraphy and fossil succession. It was later refined with the use of numerical dating techniques such as radiometric dating, but its basic framework was established before the discovery of radioactivity.

The Geologic Time Scale Was Devised Before the Techniques for Numerical