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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.