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Some 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 been abundant and found in many places. If you find 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.
But even radiometric dating does not actually directly measure the age of something (there is no substance called “age”).
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The method of reading the order is called stratigraphy (layers of rock are called strata).
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.
When they find one, they gather a sample of the hardened lava and send it off to a laboratory to test it for radioactive elements.
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When a volcano erupts, hot, molten rock (called “lava”) from deep inside the Earth is released. Elements are the “building-blocks” of the universe (for example, water is made from the elements hydrogen and oxygen).
The test results ranged from between 340,000 to 2.8 million years old!
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