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Magnetic survey was commissioned by James Eogan, Project Archaeologist at Tramore House Regional Design Office on behalf of Kilkenny County Council in line with recommendations made in the Environmental Impact Statement for the N9/N10 Kilcullen to Waterford road improvement scheme. ArchaeoPhysica Ltd. undertook survey of six areas using a wheeled caesium magnetometer cart to achieve high quality data exploiting the 0.03nT sensitivity (verified by quality assurance tests) of the instrument in this configuration. Some of the areas are associated with known monuments; others are situated close to sites previously surveyed by GSB Prospection Ltd in 2003. Some monuments are suspected on the basis of grass or shadow marks seen on aerial photographs taken along the route. Overall, the incidence of new monuments detected by the geophysical survey was low but there were significant anomalies from shallow geological sources, especially in the central and southern parts of the scheme. Some evidence was found for previous field systems while the northernmost area (Site 078) revealed two small ring ditches. Other areas, e.g., Site 016 at the southern end of the route, revealed virtually nothing of archaeological interest. In all areas and especially in the area of Sites 049 to 051 there are substantial magnetic sources of geological origin including many that could be (erroneously) interpreted as pit groups. One advantage of using the caesium magnetometer has been to examine the data in both raw total field, extracted shallow component and calculated ‘pseudo’ gradient form, allowing greater assessment of the origin of many of the more ambiguous anomalies. Primary Archive held by Tramore House NRDO. Secondary Archive held by ArchaeoPhysica