Simply Science. Radiometric dating technique that uses the decay of 39K and 40Ar in potassium-bearing minerals to determine the absolute age. Teaching Climate Change in Oklahoma: The amount of time it takes for half of the parent isotopes to radioactively decay to daughter isotopes index fossil: Radiometric Dating.
Unfortunately, these elements don't exist in dinosaur fossils themselves.
USGS ]. Englewood Cliffs, New Jersey: Deino, A. Using the decay curve shown on this graph, estimate the age of the rock. This article has been posted to your Facebook page via Scitable LearnCast. Read more about how radiometric dating factored into the history of evolutionary thought.