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The direction of the earth's magnetic field, which can be normal polarity or reversed polarity potassium-argon K-Ar method: In this figure, the unknown fossil, a red sponge, occurs with five other fossils in fossil assemblage B. Thermoluminescence testing also dates items to the last time they were heated. Walker, M. Take a look at the diagram to understand their common functions. Igneous Rock Facts.

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Third, magnetism in rocks can be used to estimate the age of a fossil site.

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Over time, the radioactive isotope of potassium decays slowly into stable argon, which accumulates in the mineral. Geological specimens that are unearthed need to be assigned an appropriate age. The following are the major methods of relative dating. All radiometric dating methods measure isotopes in some way. For example, fission track dating measures the microscopic marks left in crystals by subatomic particles from decaying isotopes.

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