A reconnaissance photogeological investigation of the eastern margins of the Eucla Basin has been carried out using small-scale (RC9 and RC10) aerial photographs, with results being compiled onto 1:100,000 scale base plans. The study has confirmed the existence of a major dune system bordering the basin's eastern side, which had previously been suspected from topographic data. The inferred Eocene dune system takes the form of a large sand ridge, up to 30 km wide and 175 metres thick in the northern part of the area studied; the foreslopes of this structure are largely mantled by Pleistocene aeolian deposits. The overall trend of this major dune system and the inferred Early Cainozoic shoreline appears to be related to a WNW trending system of regional fracturing which was active at the time of separation of Australia and Antarctica. Local deviations from this trend appear to relate to the existence of headlands, capes and islands formed of resistant basement rocks, around which large dune structures have evolved. In terms of the generally accepted model for the formation of economic heavy mineral concentrations in beach deposits, two palaeo-bays have been located through the photogeological study, which appear to face away from the prevailing wind direction and which may therefore offer enhanced prospectivity. It is also suggested that the smaller dunes on the seaward side of the very large sand ridge structures may offer sites of possible reworking and reconcentration of heavy minerals.