Start Define absolute dating of fossils

Define absolute dating of fossils

While digging the Somerset Coal Canal in southwest England, he found that fossils were always in the same order in the rock layers.

Geologists call this the principle of lateral continuity.

A fossil will always be younger than fossils in the beds beneath it and this is called the principle of superposition.

The Law of Superposition, which states that older layers will be deeper in a site than more recent layers, was the summary outcome of 'relative dating' as observed in geology from the 17th century to the early 20th century.

The regular order of occurrence of fossils in rock layers was discovered around 1800 by William Smith.

So, when looking at the history of a cliff face, it is important to read the story it tells from the bottom layer up.

Index fossils are fossils that can be used to date the rock in which they are found.

Scientists find out the age of a dinosaur fossil by dating not only the rocks in which it lies, but those below and above it.