Radioisotope dating fossils Adult funchats

Scientists use two kinds of dating techniques to work out the age of rocks and fossils. This considers the positions of the different rocks in sequence (in relation to each other) and the different types of fossil that are found in them.

The second method is called absolute dating and is done by analysing the amount of radioactive decay in the minerals of the rocks.

This is because new sediments are always laid down on top of sediments that have already been deposited.

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.

assume evolution and an old earth as their premise, and use animal or plant fossils to establish relative geological ages of specific rock layers and formations.

Such fossil assemblages are known as index fossils which have been specifically chosen by paleontologists to represent a particular sedimentary rock layer.

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