abstract
Investigation of raised beaches together with mathematical extrapolation from a river long profile suggest two definite former sea levels with the possibility of a third. True raised beaches were found at c. +3 m and c. +6 m with extrapolated levels of +5,9 m and + 10,8 m. Stone roundness and flatness indices were used as additional aids to differentiation of various levels. Comparison is made with former sea levels found on other sub-Antarctic islands.