f Seismic stratigraphy of the Fastnet Basin, offshore, Ireland

The Fastnet Basin is a small, elongate, northeast-southwest-trending basin situated at the south-western end of the North Celtic Sea Basin. Together with the North and South Celtic Sea basins and the Cockburn Basin, it forms part of a series of basins whose formation, during the Triassic, was related to the opening of the North Atlantic, the Norwegian-Greenland Sea and the Tethys Ocean. Initial rifting would have followed inherited Caledonide and Variscide fault trends.