A geophysical survey was carried out over 1ha in order provide information on the archaeological potential of land likely to be disturbed by a proposed area of biodiversity net gain. The detailed magnetic survey was carried out using a SENSYS MAGNETO�MXPDA 5 channel cart-based system. The instrument has 5 fluxgate gradiometers (FGM650) spaced 0.5m apart with readings recorded at 20Hz which equates to a survey resolution of 0.5m by c.0.15m. The results indicate the presence of spreads of soil containing very strongly magnetic material of modern origin in the central and eastern parts of the site, and more weakly positive and negative anomalies in the west. The results infer the potential for some ground make-up over much of the area with the potential also for deeper ground disturbance in the western part of the site. Anomalies related to former ridge and furrow were located near the south western corner suggesting little disturbance in this area. The efficacy of the geophysics has been affected by ferrous contamination, ground make-up and disturbance.
Donaldson et al. (Wed,) studied this question.
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