The survey was undertaken using four Bartington Grad601 sensors mounted at 1m intervals onto a rigid carrying frame. The system was programmed to take readings at a frequency of 10Hz on roaming traverses (swaths) 1m apart. These readings were stored on an external weatherproof laptop and later downloaded for processing and interpretation. The system was linked to a Trimble R12 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. Anomaly GeoSurvey v1.12.3 (Lichenstone Geoscience) and QGIS v.3.34.6 software was used to process and present the data respectively. The survey has recorded a range of magnetic anomalies indicative of post-medieval and modern agricultural activity (boundary removal, ploughing and field drains) and of modern and natural origin. No anomalies of possible or probable archaeological origin were identified by the survey. The range of magnetic anomalies recorded by the survey, including infilled furrows and ditches of non-archaeological origin, likely indicates that there was sufficient magnetic contrast, for the detection of sub-surface archaeological features over the prevailing geological conditions, if present, notwithstanding the limitations of magnetometer survey to identify certain types, sizes and periods of archaeological features. It is therefore considered that the results give a good indication of the archaeological potential of the site which is assessed as low throughout.
Ross Bishop (Wed,) studied this question.