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Much of the image includes blank areas now with little or no radar action. The "yard" wall is still showing strongly, however, and there are continuing recommendations of a hard surface in the SE corner. Time piece from 23 to 25ns. This last slice is now almost all blank, however a few of the walls are still revealing highly.

How deep are these slices? The software application I have access to makes approximating the depth a little tricky. If, however, the top three pieces represent the ploughsoil, which is most likely about 30cm think, I would think that each slice is about 10cm and we are only coming down about 80cm in total.

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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 (leading left), the magnetometry (bottom left), the 1517ns time piece (top right) and the 1921ns time slice (bottom left).

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Magnetometry, as discussed above, is a passive technique determining local variations in magnetism against a localised zero value. Magnetic susceptibility survey is an active technique: it is a measure of how magnetic a sample of sediment could be in the existence of a magnetic field. Just how much soil is checked depends on the diameter of the test coil: it can be extremely small or it can be relatively large.

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

By determining magnetic vulnerability at a relatively coarse scale, we can spot areas of human profession and middens. Unfortunately, we do not have access to a trusted mag sus meter, however Jarrod Burks (who helped teach at the course in 2013) has some outstanding examples. Among which is the Wildcat site in Ohio.

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These villages are frequently laid out around a main open location or plaza, such as this rebuilt example at Sunwatch, Dayton, Ohio. The magnetic susceptibility study assisted, nevertheless, define the primary location 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 strategy is therefore of excellent usage in defining areas of general profession instead of identifying specific features.

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