Different radiometric dating techniques

A key point is that it is no longer necessary simply to accept one chemical determination of a rock’s age.Age estimates can be cross-tested by using different isotope pairs.Older dates may change by a few million years up and down, but younger dates are stable.For example, it has been known since the 1960s that the famous Cretaceous-Tertiary boundary, the line marking the end of the dinosaurs, was 65 million years old.

Using relative dating the fossil is compared to something for which an age is already known.Also includes info on how fossils are formed, the “cleaning, preparing, & repairing” of fossils, and other useful resources. There are two main methods determining a fossils age, relative dating and absolute dating.These demonstrate that, of course, we do not know everything (and clearly never will), but we know enough.Today, innovative techniques provide further confirmation and understanding of the history of life.

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Our understanding of the shape and pattern of the history of life depends on the accuracy of fossils and dating methods.

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