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How do archaeologists investigate a large site without excavating all of it?

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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 investigate large sites without full excavation by employing non-destructive fieldwork methods that allow them to discover and record data without disturbing the site's integrity.1

Surface and Aerial Reconnaissance

Reconnaissance: Archaeologists conduct deliberate surveys by walking or motoring over the countryside to identify sites.1
Mapping: Creating topographical and period-specific maps helps analyze the distribution of artifacts in relation to the natural environment.1
Aerial Photography: This technique identifies sites that are often invisible from the ground. Variations in soil color or crop density can reveal buried structures, while specific lighting conditions—such as early morning or late evening—can highlight surface features.1

Geophysical and Subsurface Prospecting

Probing: Simple methods like tapping the ground or using deep probes can help trace buried walls and ditches.1
Periscopes: Specialized tools, such as the Nistri periscope, allow researchers to photograph the interior of tombs or burial chambers without full excavation.1
Geophysical Prospecting: Modern techniques use electricity and magnetic fields to detect buried features. Methods include measuring soil conductivity or using a magnetometer to locate magnetic disturbances caused by subsurface structures.1