Radiometric dating means placing events

Most are multidisciplinary, but some are limited, due to their nature, to a single discipline.

No system is completely failsafe and no method completely correct, but with the right application, they can and have aided researchers piece together the past and solve some of their discipline's most complex problems.

Both methods are vital to piecing together events of the past from the recent back to a time before humans and even before complex life and sometimes, researchers will combine both methods to come up with a date.

Some of the methods covered here are tried and tested, representing early methods of examining past geological, geographical, anthropological and archaeological processes.

The pre-enlightenment understanding of our geological and cultural history may now be proven wrong and subject to ridicule, but the principles of defining our place in time in the cosmos underpin many sciences.

The method is not as limited as we might think; it's been a vital method for some 70 years in discovering dates for ancient archaeological/anthropological deposits. Dendrochronology/Herbchronology: Dendrochronology is the study of tree ring growth and comparing a sequence to an accumulated database to come up with precise dates for events.

When these materials are heated to high temperatures through such processes as pottery firing, that is released.

Once it cools, these materials begin to absorb energy from the sun once more.

As lead isotope decay at a standard and slow rate, it's able to provide fairly accurate date ranges which it measures in the millions of years.

For further details, see uranium-lead dating section below.

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