Lower Permian sediments occur in all the main sedimentary basins of South Australia. The Cape Jervis Beds are described, and the Lake Phillipson Beds and Stuart Range Beds formally named. In general, the formations follow a sequence of boulder clay overlain by sands and clays mostly of marine origin, with a widely distributed fauna of arenaceous foraminifera of which Hyperammina, Ammodiscus, and Hemidiscus are the most common. Twenty three species, of which four are new, are recorded or described. The most varied fauna occurs in the Stuart Range Beds from which the gastropod Peruvispira was recovered.