Detailed digital mapping of the Tellus aero-magnetic data set has revealed the extent and timing of igneous activity in the north of Ireland during the Palaeogene period (c.66–23 million years). These data have provided a unique opportunity to constrain the geometry, scale and development of similarly aged faults in the region. Recognition and analysis of these structures has broadened the understanding of Cenozoic tectonics of Britain and Ireland, with potential implications for fluid flow in hydrocarbon and groundwater reservoirs
