Several archaeologic sites containing different artifacts were investigated by magnetic and geoelectric measurements. Kilns of medieval semisubterranean houses, ruins of a Roman brick building, and pits of a Copper Age settlement were discovered by magnetic methods. The ground plan of a Roman fortress was determined by resistivity measurements at a location where excavation was impossible because of the high groundwater level.Resistivity measurements made of a Roman homestead to determine the location of a building are discussed in detail. By correlating characteristic maxima of filtered resistivity data, the placement and orientation of walls could be determined. From the measurements, the position and extension of a group of buildings were defined.Prehistoric mining trenches can be located on the basis of anomalously low resistivities. We determined the exact location of a 50 000 year old flint mine on the outskirts of Budapest by geoelectric measurements and defined the location of the excavation on the basis of geophysical measurements. A three-dimensional picture constructed from apparent resistivities associated with different penetration depths agrees fairly well with the shape of the ancient mine trenches excavated later.

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