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Deeply subsident sedimentary basin with at least four main phases of rifting in the Adelaidean (Neoproterozoic) and one in the Early Cambrian; 12 major transgressive-regressive cycles (sequence sets) in the Adelaidean, three in the Early to Middle Cambrian.
Dominant lithologies are, in order of decreasing abundance, siltstone, sandstone (both mature and feldspathic), dolomite, limestone, diamictite, magnesite and conglomerate.
Mafic lavas occur in the early Adelaidean and Early Cambrian. Relatively immature sandstone characterises the Cambrian Kanmantoo Group.
Deformation occurred at ~500 Ma in the Delamerian Orogeny, and was strongest in the Fleurieu Arc, with granitoid intrusions in the eastern Nackara and Fleurieu Arcs, and in basement inliers of the northern Flinders Ranges. Metamorphic grade varies from sub-greenschist to mid-amphibolite facies.
