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Relative dating is used to arrange geological events, and the rocks they leave behind, in a sequence.

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The method of reading the order is called stratigraphy layers of rock are called strata. Relative dating does not provide actual numerical dates for the rocks.

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Next time you find a cliff or road cutting with lots of rock strata, try working out the age order using some simple principles:. Fossils are important for working out the relative ages of sedimentary rocks.

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Throughout the history of life, different organisms have appeared, flourished and become extinct. Many of these organisms have left their remains as kn in sedimentary rocks.

Geologists have studied the order in which fossils appeared and disappeared through time and rocks. This study is called biostratigraphy.

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Fossils can help to match rocks of the same age, even when you find those rocks a long way apart. This matching process is called correlation, which Whta been an important process in constructing geological timescales.

What does relative dating rely on fossils, called index fossils, are particularly useful in correlating rocks. For a fossil to be a good index fossil, it needs to have lived during one specific time period, be easy to identify and have rflative abundant and found in many places. For example, ammonites lived in the Mesozoic era.

If you What does relative dating rely on ammonites in a rock in the South Island and also in a rock in the North Island, you can say that both rocks are Mesozoic. Different species of ammonites lived at different times within the Mesozoic, so identifying a fossil species can help daging down when a rock was formed.

Correlation can involve matching an undated rock with Cheese slang definition dated one at another location.

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Suppose you Dark dating show a fossil at one place that cannot be dated using absolute methods. That fossil species may have been dated somewhere else, so you can match them and say that your fossil has a similar age.

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

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For example, microscopic dinoflagellates have been studied and dated in great detail around the world. Correlation with them has helped geologists date many New Zealand rocks, including those containing dinosaurs.

Bring relative dating principles to life with the activity Rock layers and relative dating. The activity offers literacy opportunities as well as practice using the science capability 'Interpret representations'. Activity idea Bring relative dating principles to life with the activity Rock layers and relative dating.

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What does relative dating rely on

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