Resolving uncertainties in foraminifera-based relative sea-level reconstruction: a case study from southern New Zealand
Garrett, E.; Brain, M.J.; Hayward, B.W.; Newnham, R.; Morey, C.J.; Gehrels, W.R.
Dr Matthew Brain firstname.lastname@example.org
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.
Garrett, E., Brain, M., Hayward, B., Newnham, R., Morey, C., & Gehrels, W. (2023). Resolving uncertainties in foraminifera-based relative sea-level reconstruction: a case study from southern New Zealand. Journal of foraminiferal research, 53(1), 78-89. https://doi.org/10.2113/gsjfr.53.1.78
|Journal Article Type||Article|
|Acceptance Date||Nov 3, 2022|
|Deposit Date||Nov 4, 2022|
|Publicly Available Date||Nov 9, 2022|
|Journal||Journal of Foraminiferal Research|
|Publisher||Cushman Foundation for Foraminiferal Research|
|Peer Reviewed||Peer Reviewed|
Accepted Journal Article
Published Journal Article
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