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Determining absolute ages radiometric dating

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The standard geologic time scale was devised according to relative time relationships observed in rocks across the world.Determining the actual ages of these time spans, and thus establishing the beginning and ending dates of geologic eons, eras, periods, and epochs, became possible with the discovery of radioactivity.

Carbon 14 occurs naturally, and is absorbed by all living things when we eat and drink.

For example, uranium has the isotopes U‐235 and U‐238; U‐238 has three more neutrons than does U‐235.

Radioactive decay is the breakdown of isotopes that contain unstable nuclei.

The important boundary between the Paleozoic era and the Precambrian era is dated at about 570 million years ago; the Mesozoic era (the “Age of the Dinosaurs”) started about 245 million years ago and ended 66 million years ago.

Radioactive elements decay at known rates of speed.