Radioactive dating of rocks

Carbon-14 cannot be used to date biological artifacts of organisms that did not get their carbon dioxide from the air.

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For example if you have a fossil trilobite and it was found in the Wheeler Formation.

Relative age dating also means paying attention to crosscutting relationships.

Say for example that a volcanic dike, or a fault, cuts across several sedimentary layers, or maybe through another volcanic rock type.

The carbon-14 it contained at the time of death decays over a long period of time.

By measuring the amount of carbon-14 left in dead organic material the approximate time since it died can be worked out.

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