Notes on late quaternary sea levels, Fiji and Rarotonga

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Abstract
Surveyed Holocene beach ridges near Taunova and Ndeumba, Fiji, have no accurate dates. Those at Ndeumba, where wind-blown sand may be absent, could represent high-spring-tide berms and they show that sea level has possibly fluctuated up to 3 ft above and 2 ft below the present within at least the later part of the Holocene. Radiocarbon dates for the 3 ft and 10 ft coral reefs at Rarotonga are 2,030 and 28,200 yr B.P. respectively, but because of recrystallisation these dates are most likely too young. A 6 ft terrace, probably younger than the 10 ft reef, is cut into older reef rock dated as greater than 48,900 yr B.P. A prograded strip of sand that almost completely encircles Rarotonga consists of storm ridges that are unsuitable for determining past sea levels. The oldest storm ridge has a radiocarbon date of 3,510 yr B.P. and is correlated with the oldest Holocene beach ridge in the Firth of Thames which has a radiocarbon date of 3,900 yr.

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