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This method is most effective for studying sedimentary rocks.

Cross dating is a method of using fossils to determine the relative age of a rock.

Relative time was determined long before absolute time.

Time in geological terms has been described in two different ways: relative time and absolute time.

Relative Time Relative time is the sequence of events without consideration of the amount of time.

Diagram showing the Uranium-Lead decay in a rock sample.

Source: The Society of Vertebrate Palaeontology The age of a rock can be calculated if we look at the ratio of uranium to lead.

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