A geophysical (magnetometer) survey, covering approximately 53 hectares, was undertaken on land adjoining the former High Marnham Power Station, High Marnham, Nottinghamshire. The survey has identifed anomalies consistent with post-medieval and more recent agricultural activity as indicated on historical mapping. The most numerous anomalies are due to ploughing, either modern or older ridge and furrow cultivation and to field drains. At least two possible enclosures have been identifed at the extreme easternmost part of the GSA, located just of the food plain of the river Trent and on the frst river terrace. The anomalies are low magnitude, fragmentary and resolution is poor due to the efects of the overhead electricity wires and by an area of magnetic disturbance immediately to the south. It is therefore possible that the potential archaeological remains may be more extensive than indicated by the survey. Based on the geophysical survey results the archaeological potential of the GSA is assessed as low except for immediately adjacent to the possible enclosures where the potential is assessed as moderate.