Resolving Uncertainties in Foraminifera-Based Relative Sea-Level Reconstruction: a Case Study from Southern New Zealand

Author:

Garrett Ed1,Brain Matthew J.2,Hayward Bruce W.3,Newnham Rewi4,Morey Craig J.5,Gehrels W. Roland1

Affiliation:

1. 1 Department of Environment and Geography, University of York, 290 Wentworth Way, Heslington, York, YO10 5NG, United Kingdom

2. 2 Department of Geography, Durham University, Lower Mountjoy, South Rd, Durham, DH1 3LE, United Kingdom

3. 3 Geomarine Research, 19 Debron Ave, Remuera, Auckland, New Zealand

4. 4 School of Geography, Environment and Earth Sciences, Victoria University of Wellington, Kelburn Parade, Wellington 6012, New Zealand

5. 5 School of Geography, Earth & Environmental Sciences, University of Plymouth, Plymouth, Devon, PL4 8AA, United Kingdom

Abstract

Abstract Since the pioneering work of David Scott and others in the 1970s and 1980s, foraminifera have been used to develop precise sea-level reconstructions from salt marshes around the world. In New Zealand, reconstructions feature rapid rates of sea-level rise during the early to mid-20th century. Here, we test whether infaunality, taphonomy, and sediment compaction influence these reconstructions. We find that surface (0–1 cm) and subsurface (3–4 cm) foraminiferal assemblages show a high degree of similarity. A landward shift in assemblage zones is consistent with recent sea-level rise and transgression. Changes associated with infaunality and taphonomy do not affect transfer function-based sea-level reconstructions. Applying a geotechnical modelling approach to the core from which sea-level changes were reconstructed, we demonstrate compaction is also negligible, resulting in maximum post-depositional lowering of 2.5 mm. We conclude that salt-marsh foraminifera are indeed highly accurate and precise indicators of past sea levels.

Publisher

Cushman Foundation for Foraminiferal Research

Subject

Paleontology,Microbiology

Reference60 articles.

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3. A review of the ecological and taphonomic controls on foraminiferal assemblage development in intertidal environments;Berkeley,;Earth-Science Reviews,2007

4. Compaction;Brain,,2015

5. Compression behaviour of minerogenic low energy intertidal sediments;Brain,;Sedimentary Geology,2011

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