Radiocarbon dating is used to measure the age of fossils Free chating sex online without pay

These break down over time in a process scientists call radioactive decay.

We know it is accurate because radiometric dating is based on the radioactive decay of unstable isotopes.So in order to date most older fossils, scientists look for layers of igneous rock or volcanic ash above and below the fossil.In the same way, geologists figure out the relative ages of fossils and sedimentary rock layers; rock layers, and the fossils they contain, toward the bottom of a stack of sediments are older than those found higher in the stack. We only know about extinct groups like dinosaurs, ammonites and trilobites through fossils.The half-life of carbon-14 is only 5,730 years, so carbon-14 dating is only effective on samples that are less than 50,000 years old.The preferred method of dating dinosaur fossils is with the radiometric dating method.

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