Magnetic gradiometer map of a prehistoric Native American campsite in Wyoming, USA. Five fire hearths (later excavated) appear as circular magnetic highs.
Image taken from Wikipedia where it is sait that the image is under public domain (http://en.wikipedia.org/wiki/Image:3030-mag.jpg)
Magnetic gradiometers are used by archaeologists for exploring sites with minimum damage to the surroundings. They are relatively easy to use and cost efficient.
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