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Archaeological digs typically proceed in thin horizontal layers, since the depth at which an object is found often corresponds to a particular period, with deeper layers generally representing older material. Excavators record the precise location of every artifact in three dimensions before removal, because context can reveal as much as the object itself; a broken pot found beside hearth ash tells a different story than the same pot found in isolation. Modern digs increasingly pair traditional trowel work with ground-penetrating radar, which can reveal buried structures without any digging, allowing teams to prioritize which areas merit the slower, more invasive excavation. Even so, once a layer is removed, it cannot be put back, making meticulous documentation the only safeguard against permanently losing information.