Abstract
Assessing the timing of seasonal movements by the prehistoric peoples of Otago has long been a problem in the archaeology of this region. The oxygen isotope ratio (18 o/16o) of mollusc shell carbonate is temperature dependent. By sampling successive increments of shell growth, palaeotemperature curves can be constructed to provide 'season of death' estimates for individual shells. In this work carbonate samples from the blue mussel (Mytilus edulis) were used to estimate the seasonality of four prehistoric fishing sites. A total of 275 samples of shell material were analysed for carbon and oxygen isotope ratios at the Institute of Nuclear Sciences, Lower Hutt. Where fishing and shellfishing were important activities they were consistently associated with the winter season. A model of seasonal activity is presented for the Early part of the prehistoric period.