How old is the earth based on radiometric age dating

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He inferred that where the layers are not horizontal, they must have been tilted since their deposition and noted that different strata contain different kinds of fossil.

Robert Hooke, not long after, suggested that the fossil record would form the basis for a chronology that would “far antedate ...

Even less should we let that knowledge influence our judgment of the players, acting as they did in their own time, constrained by the concepts and data then available.

One outstanding feature of this drama is the role played by those who themselves were not, or not exclusively, geologists.

Most notable is William Thomson, ennobled to become Lord Kelvin in 1892, whose theories make up an entire section of this collection.

He was one of the dominant physicists of his time, the Age of Steam.

The first argument was completely undermined after taking into account the amount of heat generated by radioactive decay.

Critical to this resolution were improved methods of dating, which incorporated advances in mass spectrometry, sampling and laser heating.The second referred to such topics as the detailed shape of the earth (bulging slightly at the equator) and the dynamics of the earth-moon system.The third referred to the heat of the sun, particularly the rate at which such heat is being lost, compared with the total amount of energy initially available.The most famous came in 1654, when Archbishop James Ussher of Ireland offered the date of 4004 B. Within decades observation began overtaking such thinking.In the 1660s Nicolas Steno formulated our modern concepts of deposition of horizontal strata.

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