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Using foraminiferal transfer functions to produce high-resolution sea-level records from salt-marsh deposits, Maine, USA

Department of Geographical Sciences, University of Plymouth, Plymouth PL4 8AA, UK

Quantitative analyses of foraminiferal distributions along the coast of Maine are used to provide transfer functions for reconstruction of sea-level changes from fossil foraminiferal assemblages. The indicative meaning of fossil assemblages is most accurately predicted by a training set that incorporates live and dead foraminifera and that uses flooding duration, not height, as the predictor variable. Sea-level records are produced for two sites in Maine (USA): a middle marsh site in Scarboro and a high marsh site in Machiasport. These records offer temporal resolution of five to seven years and span the past century. They are compared with instrumental data from a nearby tidal station to assess their accuracy. Strong correlations are found between the geologic records and the observational data, in particular between the foraminiferal record from Machiasport and the tide-gauge record from Eastport (r² = 0.83, p = 0.005). Thus a foraminifera-based transfer-function approach offers great potential for resolving decadal-scale sea-level changes from the geologic record.

Key Words: Sea-level change • salt-marsh foraminifera • transfer function • 210Pb • Holocene • Maine

The Holocene, Vol. 10, No. 3, 367-376 (2000)
DOI: 10.1191/095968300670746884


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