Different rock dating methods Chatter sex

was published, the earth was "scientifically" determined to be 100 million years old. In 1947, science firmly established that the earth was 3.4 billion years old.

Finally in 1976, it was discovered that the earth is "really" 4.6 billion years old… The answer of 25 million years deduced by Kelvin was not received favorably by geologists.

Other factors and basic assumptions must also be considered.

Of course, Kelvin formed his estimates of the age of the Sun without the knowledge of fusion as the true energy source of the Sun.

The use of index fossils to date rock is also a derivative of radiometric dating, not an independent method, since the age of those index fossils themselves has to be determined from radoimetrically dated type sections.

Radiometric dating of igneous layers above and below the rock layer indexing fossiliferous rock with known index fossils.

The latest high-tech equipment permits reliable results to be obtained even with microscopic samples.

Radiometric dating is self-checking, because the data (after certain preliminary calculations are made) are fitted to a straight line (an "isochron") by means of standard linear regression methods of statistics.

Orbital forcing (essentially how variations in the Earth's orbit, axis etc.

affect the amount of sunlight received) can be calculated, so the oxygen isotope startigraphy can be used to determine absolute ages.

The slope of the line determines the date, and the closeness of fit is a measure of the statistical reliability of the resulting date.

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