The rolling hills, wheat paddocks and vineyards of the Mid-North region of South Australia conceal a geological transition between the Adelaide Hills and the Flinders Ranges. Here the landscape is subtly controlled by the Neoproterozoic bedrock geology, Delamerian deformational structures, neotectonics, and regolith development. The bedrock of the Mount Lofty Ranges, Mid-North and Flinders Ranges consists of Neoproterozoic and Cambrian sedimentary and minor igneous rocks deposited in a complex of rift and sag basins, traditionally known as the Adelaide Geosyncline (Sprigg, 1952; Preiss, 1987). Thin platformal equivalents overlying the eastern Gawler Craton comprise the Stuart Shelf, while the Torrens Hinge Zone is an openly folded zone of transition between the Stuart Shelf and Adelaide Geosyncline. In the Mid-North, rifting occurring at ~800 Ma produced regional north-south trending graben structures that became filled with very thick siliciclastic and carbonate successions of the Callanna Group and Burra Group, this deposition being interspersed by minor mafic and rare felsic magmatism. The Burra Group is unconformably overlain by the Umberatana Group, this sequence commencing with widespread glaciomarine and fluvioglacial deposits of Sturtian age. Subsequent Neoproterozoic sedimentation of the upper Umberatana and Wilpena Groups was less rift-controlled, and includes deposits of the Elatina glaciation of Marinoan age. Delamerian folding and thrusting in the mid-Cambrian involved northwest- to west-directed transport and sinistral transpression, and set up the tectonic framework for neotectonic reactivation when the Australian continent became subject to east-west compression in the Cenozoic. Ancient weathering surfaces and regolith profiles were uplifted and dissected, and terrestrial to marine Tertiary basins formed on both sides of the highlands, with Quaternary alluvial deposits flanking the ranges. The excursion will visit representative sections of the Callanna Group and Burra Group, Sturtian and Marinoan glacial deposits, evidence of Delamerian thrusting and folding, neotectonic reverse faulting, Cenozoic marine and terrestrial sediments and regolith profiles, and two of South Australia’s historic copper mines at Burra and Kapunda. Much of the visited region (the BURRA 1:250,000 map sheet area, bounded by latitudes 33°S and 34°S, and longitudes 138°00’ E and 138°30’ E) was mapped in detail by the excursion leaders during the period 1988-2001, and compiled map data (100K geology) is downloadable through SARIG.