Geophysical Survey at Rathcroghan 2010-2012

Following an extensive programme of geophysical survey at Rathcroghan published in 2009, five hitherto unexplored areas were surveyed using magnetic gradiometry in 2010–12. In an area south of Oweynagat a faint circular anomaly 20m in diameter and an equally faint arc some 8m across are of possible archaeological significance. Survey between the linear earthworks known as the Mucklaghs did not reveal any definite archaeological features but examination of Cashelmanannan demonstrates this is a complex multiperiod site. East of Rathcroghan Mound and its surrounding 360m enclosure, the geophysical evidence suggests that the avenue approaching the great mound does not extend beyond the enclosure limits. An area on the northwest was also investigated but apart from a semi-circular anomaly proved to be featureless. The latter, a possible ring-ditch, does indicate the possibility of significant features adjacent to and outside the enclosure.