This geophysical survey was completed using a Sensys FMG650/3 system. Readings were recorded at a resolution of 0.01 nT and data collected with a traverse interval of 1 m and a sample interval of between 0.16 - 0.25 m. Data was collected by traversing the survey area in 4 m (Sensys FGM650/3) increments using a quadbike-towed non-magnetic cart system to achieve the best possible results. Real Time Kinematic (RTK) differential GPS equipment (Carlson BRX7 GNSS Smart Antenna) was used to accurately determine the position of the survey equipment and survey monitor data. The data processing was undertaken using TerraSurveyor64 software and consisted of a 'DeStripe' process. This process determines the average of the datapoints in each track and subtracts that value from all the datapoints along each survey track. Several linear anomalies correspond to former field boundaries illustrated on historical Ordnance Survey maps from the 19th Century. A further anomaly is interpreted as an unrecorded former boundary thought to be a continuation of a boundary noted on historic maps over land immediately south of the Site, which has since been developed into a housing estate. Historical agricultural activity in the form of probable post-medieval ridge and furrow is also weakly present throughout much of the survey data from Field 1. An uncertain trend is noted within the centre of Field 1. However, while it cannot be ruled out that this has an earlier anthropogenic origin, it is more likely to be associated with modern agricultural regimes. Variation within the underlying geological deposits is evident in the southwest corner of Field 1, as well as ferrous disturbances associated with an electrical junction box and fencing along the survey periphery.
James Howe (Wed,) studied this question.