EXTENSION OF THE LATE HOLOCENE SEA-LEVEL RECORD IN NORTH CAROLINA
We have collected foraminiferal assemblages of surface samples from two transects at Sand Hill Point (Cedar Island, North Carolina), which are combined with an existing training set (233 samples of paired observations of mean tide level and foraminiferal assemblages). This training set provides modern analogues for interpreting fossil assemblages. We apply a transfer function to foraminiferal assemblages preserved in a radiocarbon-dated core of salt-marsh peat at Sand Hill Point to produce a continuous, high resolution reconstruction of relative sea level during the late Holocene.
The salt marshes of northeastern North Carolina have a microtidal regime of less than 0.3m. In this tidal setting the ability of the transfer function method to improve the precision of sea-level reconstructions from the established age/altitude analysis is questionable. Therefore, we compare the transfer function effectiveness with an alternative classification method in a microtidal regime.
The new sea-level reconstruction from Sand Hill Point covers the past ~2200 years. It extends the existing record from nearby Tump Point, North Carolina by ca. ~1200 years using additional radiocarbon dates. We investigate whether local-scale processes affect patterns and rates of Holocene sea-level changes reconstructed elsewhere in North Carolina.