Difference Between Relative Dating and Radiometric Dating l Relative Dating vs Radiometric Dating

The key difference between relative dating and radiometric dating is that the dating cannot provide actual numerical dates whereas the radiometric dating can provide actual numerical dates.

Relative dating and radiometric dating are two types of parameters that we use to describe the age of geological features and to determine the relative order of past events. Here, we are talking about millions and billions of years. Let us discuss more details about these terms.


1. Overview and Key Difference
2. What is Relative Dating
3. What is Radiometric Dating
4. Side by Side Comparison – Relative Dating vs Radiometric Dating in Tabular Form
5. Summary

What is Relative Dating?

Relative dating is determining the relative order of past events via determining the approximate age of geological features. The method of reading this order is called stratigraphy. This does not give the actual numerical dates. Therefore, this can only explain the sequence of events without giving details on “when” these events took place. Fossils are the key to determine the relative dating in sedimentary rocks. A sedimentary rock contains different layers being the oldest at the bottom and youngest at the top. This is what we call “superposition”. With time, different organisms appear and flourish leaving their fossils in sedimentary rocks. Therefore, we can identify the sequence of different lives on earth via relative dating.

What is Radiometric Dating?

Radiometric dating is determining the exact order of past events via determining the absolute age of geological features. We can use this method to determine how long a rock was formed and the ages of fossils that are trapped in these rocks. There we use trace radioactive impurities incorporated in these rocks when they were formed.