Absolute dating can be determined by

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For example, techniques based on isotopes with half lives in the thousands of years, such as carbon, cannot be used to date materials that have ages on the order of billions of years, as the detectable amounts of the radioactive atoms and their decayed daughter isotopes will be too small to measure within the uncertainty of the instruments. The principle of superposition builds on the principle of original horizontality. A fossil that can be used to determine the age of the strata in which it is found and to help correlate between rock units isotopes: The principles of stratigraphy help us understand the relative age of rock layers.

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