The relative utility of foraminifera and diatoms for reconstructing late Holocene sea-level change in North Carolina, USA.

TitleThe relative utility of foraminifera and diatoms for reconstructing late Holocene sea-level change in North Carolina, USA.
Publication TypeJournal Article
Year of Publication2009
AuthorsKemp AC, Horton BP, Corbett D R, Culver SJ, Edwards RJ, van de Plassche O
JournalQuaternary Research
Volume71
Issue1
Pagination9-21
Date Published01/2009
KeywordsDiatoms, Foraminifera, North Carolina, Sea level, Transfer function
Abstract

Foraminifera and diatoms preserved in salt-marsh sediments have been used to produce high-resolution records of Holocene relative sea-level (RSL) change. To determine which of these microfossil groups is most appropriate for this purpose we investigated their relative utility from salt marshes in North Carolina, USA. Regional-scale transfer functions were developed using foraminifera, diatoms and a combination of both (multi-proxy) from three salt marshes (Oregon Inlet, Currituck Barrier Island and Pea Island). We evaluated each approach on the basis of transfer-function performance. Foraminifera, diatoms and multi-proxy-based transfer functions all demonstrated a strong relationship between observed and predicted elevations (r2jack > 0.74 and RMSEP < 0.05 m), suggesting that they have equal utility. Application of the transfer functions to a fossil core from Salvo to reconstruct former sea levels enabled us to consider relative utility in light of ‘paleo-performance’. Fossil foraminifera had strong modern analogues, whilst diatoms had poor modern analogues making them unreliable. This result reflects the high diversity and site-specific distribution of modern diatoms. Consequently, we used foraminifera to reconstruct RSL change for the period since ∼ AD 1800 using a 210Pb- and 14C-based chronology, and we were able to reconcile this with tide-gauge records.

URLhttp://www.sciencedirect.com/science/article/pii/S0033589408001129
DOI10.1016/j.yqres.2008.08.007