Highlights of the above 4 parts of the report include: 1) A brief review of the Palaeozoic, Mesozoic and Cainozoic tectonic history. 2) The limited amount of useable seismic, aeromagnetic and gravity data hampers structural definition of the basin. Detailed offshore seismic data is sparse and tentative limits of the western and southern margins have been determined from the relatively few old seismic lines available. The recently renewed phase of exploration within the basin should provide higher quality seismic data, enabling more detailed understanding of the structure. The earliest Cretaceous rocks are preserved in apparently isolated depressions, whereas younger Early Cretaceous and Later Cretaceous rocks have more basin wide stratal continuity, striking parallel with major fault trends. Isolation of the Gambier Embayment took place in the Tertiary, thus treatment of Cretaceous rocks in the context of separate embayments is illogical. 3) Formations of the Otway and Sherbrook Groups comprise the major units studied, and Tertiary units are briefly discussed. Because of the difficulties in correlating to the type sections in Victoria, South Australian reference sections are defined for each formation and a simplified nomenclature for South Australia adopted. 4) Hydrocarbon plays are assessed with reference to the two most prospective, capped reservoir facies complexes: (a) Early Cretaceous Otway Group (Pretty Hill Sandstone in particular), fluvial dominated and principally confined to the area of the Penola and Robe Trough north of the Tartwaup Fault. (b) Late Cretaceous Sherbrook Group, dominantly deltaic. Both facies complexes occur at depths in which drilled source rocks are oil mature (1000 - 4000 metres), based on vitrinite reflectance data.