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Dating of fossil

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Different methods have their own limitations, especially with regard to the age range they can measure and the substances they can date.

A common problem with any dating method is that a sample may be contaminated with older or younger material and give a false age.

Knowing when a dinosaur or other animal lived is important because it helps us place them on the evolutionary family tree.

Accurate dates also allow us to create sequences of evolutionary change and work out when species appeared or became extinct. These are: Where possible, several different methods are used and each method is repeated to confirm the results obtained and improve accuracy.

The number of tracks increases over time at a rate that depends on the uranium content.

It is possible to calculate the age of a sample by measuring the uranium content and the density of the fission tracks.

Each volcanic eruption produces a new deposit of ash and rock.

Living stromatolites in Shark Bay World Heritage Site of Western Australia are built by colonies of bacteria that draw energy from the sun and carbon dioxide, releasing oxygen (photosynthesis).

A sticky goo that surrounds the bacteria allows precipitation of minerals and entrapment of sediments, making a bulbous structure.

Organisms usually need to be covered by mud, sand, tar or some other sediment as soon as possible or frozen or dessicated (dried out) for fossilization to occur.

Fossils, by definition, are the remains or traces of organisms that lived at least 10,000 years ago.