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A geologic map or report typically is only a summary of investigations that frequently involve the collecting and processing of hundreds of rock samples, followed by the evaluation and interpretation of data from a variety of analytical techniques.A relative age is the age of a fossil organism, rock, or geologic feature or event defined relative to other organisms, rocks, or features or events rather than in terms of years.

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?

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.

organisms, geologists employ a variety of techniques.

These include some that establish a relative chronology in which occurrences can be placed in the correct sequence relative to one another or to some known succession of events.