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Paleomagnetism: Earth’s magnetic polarity flip-flops about every 100,000 to 600,000 years.
Methods fall into one of two categories: relative or absolute.
While K-Ar dating requires destroying large samples to measure potassium and argon levels separately, Ar-Ar dating can analyze both at once with a single, smaller sample.
Uranium series dating: U-series dating includes a number of methods, each based on different uranium isotopes’ decay rates.
For example, New Zealand’s massive Taupo volcano erupted in A. Relative chronology: Researchers have often constructed timelines of a culture or civilization based on the stylistic evolution of its decorative or dramatic arts — that’s why the method is also sometimes called stylistic seriation.
Generally speaking, the more complex a poem or piece of pottery is, the more advanced it is and the later it falls in the chronology.