Refraction and experimental reflection seismic shooting was undertaken in EL 190 on Roxby Downs Station during May 1975, along 3 lines totalling 13.2 line km. The aim was to map Cambrian and Precambrian sedimentary horizons using methods generally applied in areas of younger sediments. A refraction horizon probably correlatable with unweathered Cambrian Andamooka Limestone was mapped along two lines, mostly at a depth of less than 40 metres below the surface. Interpretation of the single fold reflection data is very difficult, but one tentative horizon in the vicinity of Olympic Dam at a depth of about 300 metres below surface has been mapped over a distance of 1 km. Reflection seismographs contain sufficient promise to suggest that further experiments could improve record quality and enable more certain quantitative interpretation.