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

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

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Fortunately for us, the majority of the sites we are interested in lie simply below the plough zone, so it'll do! How does this compare to the other techniques? Contrast of the Earth Resistance data (top left), the magnetometry (bottom left), the 1517ns time piece (top right) and the 1921ns time slice (bottom left).

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Magnetometry, as gone over above, is a passive method determining local variations in magnetism versus a localised absolutely no worth. Magnetic vulnerability survey is an active technique: it is a step of how magnetic a sample of sediment could be in the existence of a magnetic field. How much soil is evaluated depends on the size of the test coil: it can be really little or it can be fairly big.

The sensor in this case is very little and samples a tiny sample of soil. The Bartington magnetic vulnerability meter with a big "field coil" in use at Verulamium during the course in 2013. Leading soil will be magnetically boosted compared to subsoils just due to natural oxidation and reduction.

By determining magnetic susceptibility at a relatively coarse scale, we can find locations of human profession and middens. We do not have access to a trusted mag sus meter, however Jarrod Burks (who helped teach at the course in 2013) has some exceptional examples. One of which is the Wildcat website in Ohio.

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These villages are often set out around a central open location or plaza, such as this rebuilt example at Sunwatch, Dayton, Ohio. Sunwatch Village, Dayton, Ohio (picture: Jarrod Burks). At the Wildcat site, the magnetometer survey had found a variety of functions and houses. The magnetic vulnerability survey assisted, nevertheless, define the main area of occupation and midden which surrounded the more open area.

Jarrod Burks' magnetic vulnerability survey results from the Wildcat website, Ohio. Red is high, blue is low. The method is therefore of great use in specifying locations of basic occupation rather than recognizing specific functions.

Geophysical surveying is an applied branch of geophysics, which uses seismic, gravitational, magnetic, electrical and electro-magnetic physical methods at the Earth's surface to measure the physical properties of the subsurface - Geophysical Surveys in Koongamia Western Australia 2022. Geophysical surveying methods usually determine these geophysical properties along with abnormalities in order to assess different subsurface conditions such as the existence of groundwater, bedrock, minerals, oil and gas, geothermal resources, voids and cavities, and a lot more.