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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.

Paleontologists still commonly use biostratigraphy to date fossils, often in combination with paleomagnetism and tephrochronology.

These methods — some of which are still used today — provide only an approximate spot within a previously established sequence: Think of it as ordering rather than dating.

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

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Measuring carbon-14 in bones or a piece of wood provides an accurate date, but only within a limited range.

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.

Egyptologists, for example, created a relative chronology of pre-pharaonic Egypt based on increasing complexity in ceramics found at burial sites.

The polarity is recorded by the orientation of magnetic crystals in specific kinds of rock, and researchers have established a timeline of normal and reversed periods of polarity.

Paleomagnetism is often used as a rough check of results from another dating method.

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