Comprises details of the operations, field acquisition, results and interpretation of the seismic survey. A total of 114 miles of 6-fold CDP stack data was recorded. The lines crossed anomalous areas defined in a 1968 survey. Two principal structures are defined (Sultana Point Anticline, Port Stanvac structure); both appear to be associated with a NE-SW trend across the Gulf St Vincent. A cross-trend extends from the Stansbury vicinity towards Carrickalinga. Over 6000' of section is present above the high velocity Lower Cambrian liemstones. Onland seismic was digitised and reviewed enabling mapping of the lower Middle Cambrian unconformity throughout the southern Yorke Peninsula. Two reconnaissance lines and replay of earlier data are recommended.