The survey was undertaken using four Bartington Grad601 sensors mounted at 1m intervals (1m traverse interval) onto a rigid frame. The system was programmed to take readings at a frequency of 10Hz (allowing for a 10-15cm sample interval) on roaming traverses (swaths) 4m apart (Illus 4). These readings were stored on an external weatherproof laptop and later downloaded for processing and interpretation. The system was linked to a Trimble R8s Real Time Kinetic (RTK) differential Global Positioning System (dGPS) outputting in NMEA mode to ensure a high positional accuracy for each data point. MLGrad601 and MultiGrad601 (Geomar Software Inc.) software was used to collect and export the data. Terrasurveyor V3.0.37.0 (DWConsulting) software was used to process and present the data. The survey has identified numerous modern, agricultural, geological anomalies, in addition to a single probable archaeological feature within the PDA. Whilst large areas of magnetic disturbance are present, the local geological and pedological conditions have created a relatively homogenous magnetic background against which a single small, irregularly shaped, enclosure has been recorded and interpreted as probable archaeology. Elsewhere, the PDA is dominated by modern magnetic disturbance, geological variation, and possible extraction activity. A very strong band of dipolar magnetic disturbance running through the PDA from north to south locates the former line of the Verney Junction to Banbury Railway and will be caused by the remediation of the former railway line. Evidence of historical agricultural practice (ridge and furrow cultivation) has also been identified throughout the PDA.
Christian Adam (Sat,) studied this question.