Can radiometric dating tell us

Dinosaur bones, on the other hand, are millions of years old -- some fossils are billions of years old.To determine the ages of these specimens, scientists need an isotope with a very long half-life.

This document is partly based on a prior posting composed in reply to Ted Holden.These layers are like bookends -- they give a beginning and an end to the period of time when the sedimentary rock formed.By using radiometric dating to determine the age of igneous brackets, researchers can accurately determine the age of the sedimentary layers between them.A common form of criticism is to cite geologically complicated situations where the application of radiometric dating is very challenging.These are often characterised as the norm, rather than the exception.