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Since certain species of animals existed on Earth at specific times in history, the fossils or remains of such animals embedded within those successive layers of rock also help scientists determine the age of the layers.

Similarly, pollen grains released by seed-bearing plants became fossilized in rock layers.

The requirement of identical burial conditions means that fluoride dating works best when it is applied within a single site with little variation in soil chemistry.

Many different techniques can be used to measure bone fluoride content, but measurement by ion selective electrode is the easiest and simplest method available today.

Absolute dating is used to determine a precise age of a fossil by using radiometric dating to measure the decay of isotopes, either within the fossil or more often the rocks associated with it.

Geologic research and mapping requires the determinations of the ages and composition of rocks.

Dating techniques are procedures used by scientists to determine the age of an object or a series of events.

The two main types of dating methods are relative and absolute.

Geochronology is the science of dating and determining the time sequence of events in the history of the Earth.

This web page provides an overview of selected geochronology methods used by USGS scientists.

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