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Xenotime (YPO) is an isotopically robust chronometer, which is increasingly being recognized as a trace constituent in siliciclastic sedimentary rocks.

It may start to grow during early diagenesis, typically forming syntaxial outgrowths on detrital zircon grains.

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Both the physical geologists and paleontologists could point to evidence that much more time was needed to produce what they saw in the stratigraphic and fossil records.

As one answer to his critics, Kelvin produced a completely independent estimate -- this time for the age of the Sun.

Other factors and basic assumptions must also be considered.

The solar estimate was based on the idea that the energy supply for the solar radioactive flux is gravitational contraction.

Recent advances in the field of geochronology have led to a greater understanding of the scale and duration of geological processes.

It is currently possible to date igneous and metamorphic rocks by a variety of radiometric methods to within a million years, but establishing the depositional age of sedimentary rocks has remained exceedingly difficult.

Xenotime has the properties of an ideal U–Pb chronometer, containing elevated levels of U (generally 1000 ppm) and very low concentrations of initial common Pb.

In addition, it has an exceptional ability to remain closed to element mobility during later thermal events, and commonly yields concordant and precise dates.

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