Summary:The Antarctic region has profoundly affected the global climates of the Cenozoic, influencing sea levels, atmospheric composition and dynamics, and ocean circulation. According to IPCC-2007 (IPCC, 2007) worst-case scenario projections, temperatures by 2100 are likely to exceed those that have been experienced by the Earth in the last 40 myr when the Antarctic Ice Sheet may have first developed. This implies that the Ice Sheet will become unsustainable, with huge implications for global sea-levels. In press 2.2. Laboratorio di paleomagnetismo JCR Journal reserved