Land South of Ordsall

A temporary grid system was established over the site and marked out using canes. The location of the grid was set out using an RTK GPS system theoretically accurate to some 0.01m and referenced to OS co-ordinates. Data was collected using a cart carrying four paired Bartington magnetic sensors. Four sensors mounted 1m horizontally apart and very accurately aligned to nullify the effects of the earth's magnetic field. Readings relate to the difference in localised magnetic anomalies compared with the general magnetic background. Each data point is geographically referenced using an on-board Trimble RTK survey grade GPS system. Readings were taken at 0.125m centres along traverses 1.0m apart. Readings relate to the difference in localised magnetic anomalies compared with the general magnetic background. The magnetometer survey has recorded magnetic responses which have been interpreted as being of archaeological interest. Enclosures are visible in Areas 3 and 4, along with pit-like responses, ditches, and some of the enclosures appear to have internal features including a tentative ring ditch. Some of the anomalies in Areas 3 correspond with undated linear features and enclosures that are recorded in the HER (MNT4499). Ditch-like responses have also been plotted in Areas 1, 2 and 6 which may also be of interest. Numerous responses of uncertain origin have also been recorded and while the majority are probably due to natural or agricultural processes, archaeological origins cannot be discounted. Corroborated and conjectural former field boundaries have been marked in all of the survey areas. In Areas 2, 3, 4 and 5 linear anomalies of varying magnetic strengths mark the routes of land drains. Amorphous zones of increased response in Areas 1, 2, 3 and 5 have been caused by variations in the underlying geology. Zones of magnetic disturbance are also visible which are likely to have been caused by spreads of modern debris.