Using relative dating what can geologists determine
Scientists can't exactly determine the age of a rock but they can determine which layer is oldest and youngest, and then try to determine the age of the ones in the middle off of the basic observation.A half-life is half of the time it takes for a radioactive atom to decay, and it helps in determining the absolute age of a rock because if you know its half-life, you can multiply it by two to get its actual or absolute age.Good question: Geologist use these methods to determine the ages of rocks.The absolute age of the rock and relative age of the rock.Relative dating is used to arrange geological events, and the rocks they leave behind, in a sequence.The method of reading the order is called stratigraphy (layers of rock are called strata).
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.
Relative dating does not provide actual numerical dates for the rocks.
Fossils are important for working out the relative ages of sedimentary rocks.
Scientists use carbon dating to determine the age of a rock.
Organic material from the rock is tested to determine the ratio of two different types of carbon, and use that information to calculate the estimated age.
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Radioisotopes are the best method for determining absolute age, except when dates are chiseled in manufactured rock by reliable sources for which there is a well established provenance.