This excursion guide is a refinement of a 6-day excursion led by Parker, Fanning and Flint in 1980 at the height of economic interest in the basement geology of the Gawler Craton. The interest in those days was for Alligator River - style uranium mineralisation, Broken Hill - style base metal mineralisation and, particularly, for clues to the concealed basement geology of the Olympic Dam region. A much shortened, 2-day excursion, based on the same guide but led by Dr Robin Oliver of the University of Adelaide, was run in conjunction with the Fourth International Antarctic Symposium in 1982 to compare southern Eyre Peninsula with similar rocks of the Commonwealth Bay region, Antarctica. Then, in 1986, in conjunction with the Eighth Australian Geological Convention and supported by the Specialist Group in Tectonics and Structural Geology, the basics of this excursion guide were prepared. The latter was essentially a 3-day excursion to study, especially, the superb mylonites and highly deformed granitic gneisses. These notes and stops have been slightly expanded here to include a few extra stops from the original guidebook. The guidebook is not an absolutely exhaustive treatise on the geology of Eyre Peninsula, but it is still the most complete documentation yet compiled. It describes a truly epic tour of some of the best coastal outcrops in Australia.