Studies of Quaternary geomorphological development in south-eastern Australia and throughout the world have often relied on surface features such as river terracing (e.g. Bishop and Brown, 1992). Difficulties in directly dating terraces have encouraged workers to look at limestone cave systems; these preserve a record of landscape evolution, including the development of passage levels, growth of speleothems, and accumulation of cave sediments, which can often be correlated with river terracing (e.g., White and White, 1974; Williams, 1982; Ford et al., 1983; Palmer, 1989; Webb et al, 1992). Dating the age of development of cave features can be challenging, however. Uranium series dating, commonly applied to speleothems, has an effective upper bound of 350 ka, and has proved useful in Europe and North America, where most cave development occurred during the late Pleistocene (Ford and Williams, 1989; Atkinson et al, 1978; Gascoyne et al, 1981; Gascoyne, 1984). However, there is an accumulating body of evidence that much cave development in Australia occurred during the Tertiary (Webb et al, 1991) or even earlier (Osborne and Branagan, 1988; Osborne, 1990), well beyond the limits of uranium series dating. For these caves, other techniques must be used, such as palaeomagnetic analysis of cave sediments; this has been applied to date cave development over the last 2 Ma (e.g., Schmidt, 1982; Schmidt et al, 1984; Noel and Thistlewood, 1989).