Please use this identifier to cite or link to this item: https://apo.ansto.gov.au/dspace/handle/10238/8757
Title: Timing, magnitude and effects of late Holocene sea level drawdown on island habitability, Aitutaki, Cook Islands
Authors: Allen, MS
Morrison, AE
Lorrey, AM
Zhao, JX
Jacobsen, GE
Keywords: Sea level
Oceania
Coastal regions
Quaternary period
Corals
Charcoal
Issue Date: 6-Jul-2016
Publisher: Oceania Publications
Citation: Allen, M. S., Morrison, A. E., Lorrey, A.M., Zhao, J.X., & Jacobson, G.E. (2016). Timing, magnitude and effects of late Holocene sea level drawdown on island habitability, Aitutaki, Cook Islands: Timing, magnitude and effects of late Holocene sea level. Archaeology in Oceania, 51 (2): 108-121. doi:org/10.1002/arco.5102
Abstract: Geologist Bill Dickinson argued that prior to late Holocene sea level fall, in many Pacific island settings low-lying islands were awash, shallow nearshore environments were restricted and human settlement was constrained or sometimes impossible. Stable coastlines and islets of modern configuration only developed after the “cross-over date”, when declining high-tide levels fell below mid-Holocene low-tide levels, a regionally variable process. We evaluate evidence from the almost-atoll of Aitutaki, Cook Islands against this model, providing: (1) a local late Holocene sea level reconstruction including nine U/Th-dated microatolls; (2) 22 new AMS dates on human activities, many from small, low-lying offshore islets; and (3) elevation data for 14C-dated cultural deposits on three islets. Our results include an early first millennium sea level position 0.74–0.97 m (± 0.126) above modern height-of-living-corals, an eighth to eleventh century AD minimum relative to the long-term trend, and a sea level rise peaking in the mid-fourteenth to sixteenth centuries. This reconstruction, combined with twelfth century AD Cocos nucifera charcoal, informs on the timing and distribution of human activities across Aitutaki's evolving land and seascapes and sea level impacts. While our findings do not contradict Dickinson's model of sea level constrained island settlement, other explanations cannot be excluded. © 2016, Oceania Publications.
Gov't Doc #: 8255
URI: http://dx.doi.org/10.1002/arco.5102
http://apo.ansto.gov.au/dspace/handle/10238/8757
ISSN: 0728-4896
Appears in Collections:Journal Articles

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