AIM:To provide critical structural information on the relationships between major structural provinces (viz. Stansbury Basin / Adelaide Geosyncline / Kanmantoo Trough / Murray Basin) and, in particular, test an hypothesis that folded rocks from the east have been thrust westwards over, and now lie above, some younger Stansbury Basin marginal sediments. Survey dates: 14 - 15/7/92. Energy source: Tuned airgun array. CDP coverage: 6000%. Recording mode: 300 channel digital - LRS 16A Kiloseis streamer system. SP interval: 26.67 metres, group interval: 13.33 metres.RESULTS:Line 92DME-1 (a southeasterly extension of Canyon's line 92-13) totalling 63.424 line km was acquired by the Western Geophysical M/V Western Atlas, and processed by Alvin R. Hosking in Houston, Texas. Interpretation of the final stacked data from this line by geophysicists from the University of Adelaide and SADME has revealed that:(1) a fundamental Cambrian depositional interface exists between the ?coeval Early Cambrian platformal and (Kanmantoo) trough portions of the Stansbury Basin; (2) the boundary between the platform zone and the sedimentary prism of the Kanmantoo Trough was reactivated by compression during the Cambro-Ordovician Delamerian Orogeny, resulting in significant reverse faulting and orogenic supra-crustal shortening; and (3) compressional deformation during the strong Delamerian and subsequent weaker Tertiary - Holocene tectonic events appears to have been focused on the western part of the transition zone of an interpreted east side Gulf Saint Vincent foreland basin margin, in the latter instance forming the current topography of southern Fleurieu Peninsula.