Relative dating refers to non-chronometric methodologies that produce seriation based on stylistic comparison and stratigraphic assumptions.

On the other hand, absolute dating methods are based on scientific techniques that yield a chronometric age for a phenomenon in direct or indirect physical relation to rock art (same age, older,...

Throughout the history of life, different organisms have appeared, flourished and become extinct.

Many of these organisms have left their remains as fossils in sedimentary rocks.

They said the sample was contaminated with excess argon.

Using new samples of feldspar and pumice they ‘reliably dated’ the tuff at 2.61 million years, which agreed nicely.

Tests by other scientists using paleomagnetism and fission tracks confirmed the lower date.

So by 1980 there was a new, remarkably concordant date for the KBS tuff, and this became the one that was widely accepted.

Some of the most useful fossils for dating purposes are very small ones.

For example, microscopic dinoflagellates have been studied and dated in great detail around the world.

Relative dating does not provide actual numerical dates for the rocks.