Cons can be said as: All radioactive dating except Carbon 14 are based on atoms found in igneous rocks. Fossils are almost not found in igneous rocks. So radioactive dating cannot be used directly to date fossils. The one exception can be Carbon 14.

What are the cons of radioactive dating?

Expensive, because you have to determine the isotope of very trace quantities of radioelements, and not just the concentration of the element in a mass spectrometer.Requires highly skilled specialists.Will not work for fossils or sedimentary rocks.Possible sources of error such as a contamination of a sample.More items