Widespread marine to paralic Cambrian-Ordovician strata form the major Early Palaeozoic succession in South Australia. The Late Palaeozoic succession consists chiefly of non-marine Late Carboniferous to Permian sediments although restricted marine facies are locally evident. Eight separate sedimentary basins have been defined for the thickest sequences but in the Early Cambrian, and again in the Early Permian, there was probably a degree of lateral continuity of deposition. Present basin outlines are thus partly the result of uplift and erosion in subsequent tectonic regimes. Only two in situ Devonian occurrences have been confirmed on fossil evidence although wider lithostratigraphic correlations have been suggested. Late Ordovician to Silurian and Late Devonian to Middle Carboniferous strata are unknown.