Here is a survey
on a site near Oxford. Like most Iron Age sites on Thames gravels it
responds well to magnetometry.
It is good that
this technique enables one to be fairly certain that the entirety of the
settlement has been identified.
The site has
some 3 or 4 presumably Iron age houses, associated paddocks, and is
surrounded by presumably medieval ridge and furrow. There is a possible
medieval track crossing the area and here are other, presumably Bronze Age
The ridge and furrow appears more pronounced near the
settlement. This is probably because the
earlier occupation will have had fires which will have enhanced the magnetic
qualities of the soil in that area.
survey of Iron Age farmstead and other features near Oxford