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Much of the image consists of blank areas now with little or no radar response. The "courtyard" wall is still revealing highly, nevertheless, and there are continuing recommendations of a hard surface area in the SE corner. Time piece from 23 to 25ns. This last slice is now almost all blank, but a few of the walls are still revealing highly.

How deep are these pieces? The software I have access to makes approximating the depth a little challenging. If, nevertheless, the top 3 slices represent the ploughsoil, which is most likely about 30cm think, I would guess that each piece is about 10cm and we are just coming down about 80cm in total.



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Thankfully 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 slice (leading right) and the 1921ns time slice (bottom left).

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Magnetometry, as discussed above, is a passive strategy measuring regional variations in magnetism versus a localised no value. Magnetic vulnerability study is an active technique: it is a procedure of how magnetic a sample of sediment might be in the presence of an electromagnetic field. Just how much soil is checked depends upon the diameter of the test coil: it can be really little or it can be relatively large.

The sensor in this case is very little and samples a tiny sample of soil. The Bartington magnetic susceptibility meter with a large "field coil" in use at Verulamium throughout the course in 2013. Leading soil will be magnetically improved compared to subsoils merely due to natural oxidation and decrease.

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

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

Jarrod Burks' magnetic susceptibility study results from the Wildcat website, Ohio. Red is high, blue is low. The method is for that reason of excellent use in specifying locations of general profession rather than recognizing particular functions.

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