Relative dating of rocks ppt
Stratigraphy: The oldest dating method which studies the successive placement of layers.It is based on the concept that the lowest layer is the oldest and the topmost layer is the youngest.The table below shows characteristics of some common radiometric dating methods.Geologists choose a dating method that suits the materials available in their rocks. Measuring isotopes is particularly useful for dating igneous and some metamorphic rock, but not sedimentary rock.The relative dating techniques are very effective when it comes to radioactive isotope or radiocarbon dating.
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These use radioactive minerals in rocks as geological clocks.For example, fission track dating measures the microscopic marks left in crystals by subatomic particles from decaying isotopes.
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