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Climate and Sea Level During Oxygen Isotope Stage 7b: On-Land Evidence from New Zealand

Published online by Cambridge University Press:  20 January 2017

Brad Pillans ,
Geoff Holgate  and
Matt McGlone
Brad Pillans
Affiliation:
Research School of Earth Sciences, Victoria University of Wellington, Private Bag, Wellington, New Zealand
Geoff Holgate
Affiliation:
Research School of Earth Sciences, Victoria University of Wellington, Private Bag, Wellington, New Zealand
Matt McGlone
Affiliation:
Botany Division, DSIR, Private Bag, Christchurch, New Zealand
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Abstract

Strata at Landguard Bluff, near Wanganui, New Zealand preserve a clear record of relative sea-level changes during oxygen-isotope stage 7. Two relative high sea-level stands (during stages 7a about 210,000 yr ago and 7c about 240,000 yr ago) are separated by a relative low sea level (stage 7b) that was at least 32 m lower than present. Pollen analysis of sediment deposited during stage 7b indicates climate at the time was up to 3°C cooler than present. The climate and sea-level evidence from Landguard Bluff are consistent with oxygen-isotopic evidence from deep-sea cores indicating a marked cooling during stage 7, which is closely associated with a summer radiation minimum centered at about 230,000 yr ago in the Northern Hemisphere.

Type
Original Articles
Information
Quaternary Research , Volume 29 , Issue 2 , March 1988 , pp. 176 - 185
Copyright
University of Washington

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