Roman Temple in England
A buried Roman temple in England was readily mapped using GPR amplitude slice-maps, but was difficult to identify with magnetic mapping. An integration of the two methods shows that the temple and its surrounding precinct has distinct walls, which produce radar reflections. Those walls are not composed of stones that are magnetic, and are slightly less magnetic than the surrounding ground. Areas where the stones had been robbed in trenches, and then those trenches were backfilled with soil and sediment, appear as negative magnetic anomalies. Two very highly magnetic areas north and south of the temple complex were places where burned materials were placed in excavated holes in the ground. In one of those holes distinct horizontal surfaces are visible with GPR adjacent to the holes, which may be the floors of buildings that stood there prior to the temple construction, and which were burned and pushed into the hole. A small post-Roman period building that was likely constructed of wood within what were still standing walls of the temple was effectively invisible in the magnetic maps, and very difficult to see in GPR maps. The GPR reflection profiles across this small building show that it was filled with sediment, and contains a possible hearth, visible with magnetic readings.
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