| 21. | English Heritage conducted a geophysical survey in 2004.
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| 22. | Geophysical surveys were also carried out across much of the surrounding area and around Stonehenge Bowl.
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| 23. | Archaeologists use a variety of tools when carrying out surveys, including geophysical survey and aerial photography.
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| 24. | A geophysical survey carried out at the end of 2005 revealed extensive remains in the area.
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| 25. | Geophysical surveys were carried out in 1987 and 1993 with exploratory trenches being dug in 1996.
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| 26. | The data collected from a geophysical survey is analysed to draw meaningful conclusions out of that.
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| 27. | These include Airflite, a large defence contractor and Fugro the world's largest aerial geophysical survey company.
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| 28. | It began its investigations by conducting a large-scale geophysical survey of the former urban center of Gabii.
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| 29. | Mills'company, Geophysical Survey Systems, Inc ., made a radar system they used, which can search under ground.
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| 30. | The site saw no further work until a geophysical survey in 2006 and further excavations in 2007.
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