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Tradition paleontological and biostratigraphic correlation methods are still perhaps the most common relative dating methods used by geologists.

More modern correlation technologies include use of marine stable isotope records, paleomagnetic dating, tephrachronology, geomorphological methods, sedimentation characteristics, and other geochemical and radiometric methods.

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.

As the carbon-14 decays, it is replaced with more carbon-14. Scientists estimate the ages of rock layers in order to better understand Earth’s history and the history of life.

After the organism dies, it stops taking in carbon. The carbon-14 that is in its body continues to decay. Apply lesson concepts to infer how many protons and neutrons are found in each atom of carbon-13. How useful would carbon-13 be for radiometric dating?

New dating methods are invented all the time, however, most have practical limitations.

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Similarly, in geology, if distinctive granitic pebbles can be found in the sediment beside a similar granitic body, it can be inferred that the granite, after cooling, had been uplifted and eroded and therefore was not injected into the adjacent rock sequence.Although with clever detective work many complex time sequences or relative ages can be deduced, the ability to show that objects at two separated sites were formed at the same time requires additional information.A coin, vessel, or other common artifact could link two archaeological sites, but the possibility of recycling would have to be considered.Relatively young deposits can be sometimes dated using tree rings, varved-lake sediments, coral growth patterns, and other methods.Paleontology is the study of life in past geologic periods (fossil plants and animals), incorporating knowledge of an organism's phylogeny, relationships to existing organisms, and correlation to an established chronology of Earth History.

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