Isotope dating

How Old is the Earth Radiometric Dating - TalkOrins Archive

He question of the ages of the Earth and its rock formations and features has fascinated philosophers, theologians, and scientists for centuries, primarily because the answers put our lives in temporal perspective.

Radiometric Dating and Tracing - EOLSS

Until the 18th century, this question was principally in the hands of theologians, who based their calculations on biblical chronology.

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Bishop James Ussher, a 17th-century Irish cleric, for example, calculated that creation occurred in 4004 B. There were many other such estimates, but they invariably resulted in an Earth only a few thousand years old.

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They observed that every rock formation, no matter how ancient, appeared to be formed from still older rocks.

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