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Biostratigraphy: One of the first and most basic scientific dating methods is also one of the easiest to understand.

Layers of rock build one atop another — find a fossil or artifact in one layer, and you can reasonably assume it’s older than anything above it.

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.

This includes factoring in many variables, such as the amount of radiation the object was exposed to each year.

These techniques are accurate only for material ranging from a few thousand to 500,000 years old — some researchers argue the accuracy diminishes significantly after 100,000 years.

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