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Time slice from 23 to 25ns. This last slice is now practically all blank, but a few of the walls are still showing strongly.

How deep are these slices? Regrettably, the software application I have access to makes approximating the depth a little challenging. If, nevertheless, the top three slices represent the ploughsoil, which is most likely about 30cm think, I would guess that each slice has to do with 10cm and we are only coming down about 80cm in overall.

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Luckily for us, many of the websites we have an interest in lie just listed below the plough zone, so it'll do! How does this compare to the other methods? Comparison of the Earth Resistance data (top left), the magnetometry (bottom left), the 1517ns time piece (top right) and the 1921ns time piece (bottom left).

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Magnetometry, as gone over above, is a passive method determining local variations in magnetism against a localised zero value. Magnetic vulnerability survey is an active technique: it is a step of how magnetic a sample of sediment might be in the presence of a magnetic field. How much soil is tested depends upon the diameter of the test coil: it can be extremely small or it can be fairly big.

The sensing unit in this case is very small and samples a small sample of soil. The Bartington magnetic vulnerability meter with a big "field coil" in use at Verulamium throughout the course in 2013. Leading soil will be magnetically boosted compared to subsoils simply due to natural oxidation and decrease.

By measuring magnetic vulnerability at a relatively coarse scale, we can spot areas of human occupation and middens. We do not have access to a reputable mag sus meter, however Jarrod Burks (who helped teach at the course in 2013) has some exceptional examples. Among which is the Wildcat website in Ohio.

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These villages are frequently laid out around a central open area or plaza, such as this reconstructed example at Sunwatch, Dayton, Ohio. The magnetic vulnerability study assisted, however, define the main area of occupation and midden which surrounded the more open area.

Jarrod Burks' magnetic vulnerability survey arises from the Wildcat site, Ohio. Red is high, blue is low. The method is therefore of great usage in defining locations of general occupation instead of recognizing particular functions.

Geophysical surveying is an applied branch of geophysics, which uses seismic, gravitational, magnetic, electrical and electromagnetic physical methods at the Earth's surface to measure the physical homes of the subsurface - Geophysical Methods in Westminster Aus 2021. Geophysical surveying techniques usually determine these geophysical homes together with abnormalities in order to examine various subsurface conditions such as the presence of groundwater, bedrock, minerals, oil and gas, geothermal resources, spaces and cavities, and far more.