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Time slice from 23 to 25ns. This last slice is now nearly all blank, however a few of the walls are still revealing highly.

How deep are these pieces? Sadly, the software I have access to makes approximating the depth a little difficult. If, however, the leading 3 pieces represent the ploughsoil, which is most likely about 30cm think, I would think that each slice is about 10cm and we are only getting down about 80cm in overall.

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Luckily for us, the majority of the sites we are interested in lie just listed below the plough zone, so it'll do! How does this compare to the other approaches? Comparison of the Earth Resistance information (top left), the magnetometry (bottom left), the 1517ns time slice (top right) and the 1921ns time slice (bottom left).

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Magnetometry, as gone over above, is a passive technique determining regional variations in magnetism against a localised no value. Magnetic vulnerability study is an active strategy: it is a step of how magnetic a sample of sediment could be in the existence of a magnetic field. Just how much soil is tested depends on the size of the test coil: it can be extremely small or it can be fairly big.

The sensing unit in this case is very little and samples a tiny sample of soil. The Bartington magnetic susceptibility meter with a big "field coil" in usage at Verulamium during the course in 2013. Leading soil will be magnetically enhanced compared to subsoils simply due to natural oxidation and decrease.

By measuring magnetic susceptibility at a fairly coarse scale, we can find locations of human profession and middens. We do not have access to a reliable mag sus meter, but Jarrod Burks (who helped teach at the course in 2013) has some outstanding examples. One of which is the Wildcat site in Ohio.

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

Jarrod Burks' magnetic vulnerability survey arises from the Wildcat website, Ohio. Red is high, blue is low. The strategy is therefore of great use in defining locations of basic occupation rather than determining particular functions.

Geophysical surveying is a used branch of geophysics, which uses seismic, gravitational, magnetic, electrical and electro-magnetic physical methods at the Earth's surface area to measure the physical homes of the subsurface - Course: Basics In Geophysical Surveying in North Fremantle WA 2021. Geophysical surveying techniques typically determine these geophysical properties together with anomalies in order to examine numerous subsurface conditions such as the presence of groundwater, bedrock, minerals, oil and gas, geothermal resources, spaces and cavities, and far more.