The Bight Basin on the southern margin of Australia is nearly 2000 km wide from west to east and overlies a number of different basement terranes including the Albany-Fraser Orogen in the west and the Gawler Craton in the east.

Terrane boundaries in the onshore portion of the southern margin of Western Australia have been considerably refined in recent years (e.g. Spaggiari et al., 2015), and many terrane linkages between Australia and Antarctica have been proposed (e.g Fitzsimons, 2003; Jacob & Dyment, 2014), yet the extension of these boundaries immediately offshore is poorly constrained.  In the shallower parts of the Bight Basin, basement is well imaged on seismic data, but many parts of the basin are too deep for imaging with conventional seismic data and thus the basement structure in these areas remains unclear.

This study uses a combination of potential field and seismic data to suggest offshore continuation of a number of key basement trends and provide better constraints on the structural styles observed in the overlying sedimentary sequences within the Bight Basin.