Absolute dating volcanic ash layers

When a sample is heated to high temperatures in a laboratory, the trapped electrons are released and return to their normal positions in their atoms.This causes them to give off their stored energy in the form of light impulses (photons). A similar effect can be brought about by stimulating the sample with infrared light.

The methods that are used depend on the presumed age of the site from which they were excavated.When a fossil is sandwiched between two such volcanic deposits, their potassium-argon dates provide a minimum and maximum age.In the example below, the bone must date to sometime between 1.75 and 1.5 million years ago.This will always be true due to the finite limits of measuring equipment.

Absolute dating volcanic ash layers comments

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