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Why do archaeologists record the exact horizontal and vertical location of every find?

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Archaeology Archaeologists mapping their finds at Pachacamac, Peru, an Indigenous town occupied from approximately 200 bce to 1532 ce, when it was sacked by conquistadors under the command of Francisco Pizarro.

Archaeologists record the exact horizontal and vertical location of every find because the context of an artifact is essential to understanding its history and the environment of the people who created it. By documenting these precise coordinates, researchers can reconstruct the spatial and temporal relationships between objects and the layers of earth in which they are found.

This practice relies heavily on the principles of stratigraphy, specifically the law of superposition. This principle dictates that in undisturbed deposits, the oldest layers are located at the lowest levels, while more recent remains are deposited on top of the debris of previous generations.1

Recording these locations allows archaeologists to:
* Establish a chronological sequence of human activity.1
* View material remains not as isolated objects, but within the context of their original environments.2
* Correlate findings across different sites to map trade routes, identify manufacturing centers, and understand prehistoric distribution patterns.2

By maintaining this objective record, archaeologists transform raw finds into meaningful data that reveal how past societies lived, interacted, and adapted to their surroundings.2