Pollen analytical results from the organic sediments of Quincan Crater broadly confirm the sequence of vegetation changes indicated in a previous study at Lake Euramoo. Only the later stage of the transition from sclerophyll vegetation to ‘warm temperate’ rain forest, culminating about 6000 B.P., is represented at Quincan, but indicates that the change was most probably due to an increase in effective precipitation. Afterwards rain forest remained the principal vegetation type for 3000 or 4000 years but changed from the initial ‘warm temperate’ to a ‘subtropical’ kind probably as a result of an increase in temperature and possibly also of precipitation. At about 2000 B.P. the ‘subtropical’ rain forest assumed a ‘drier’ facies and there was a partial readvance of the sclerophyll vegetation.