Abstract
Interpretation of three recently recorded offshore seismic lines provides a regional picture of the geology from the Gawler Craton across the Stansbury and Troubridge Basins to the Otway Basin in South Australia. The 300 km transect crosses most of the Cambrian Stansbury Basin, which consists of a marginal platform in the west and the Kanmantoo Trough in the east. The Kanmantoo Trough is filled by an eastward deepening sedimentary prism formed by the Kanmantoo Group. The little‐deformed platformal Cambrian sedimentary rocks onlap the Gawler Craton and underlie the Gulf St Vincent. The eastern margin of the platform is separated from the western Kanmantoo Trough by a northeast‐trending zone of intense deformation. This transition zone comprises numerous southeast‐dipping faults which are correlated to faults and shear zones with reverse displacement that are mapped in outcrop on Kangaroo Island and Fleurieu Peninsula. These faults constitute contractionally reactivated former extensional faults, which cont...
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