Stratigraphy,pollen and 14C dating of Johnston's Gum Hole,a late Quaternary fossil kauri (Agathis australis) site,Northland, New Zealand |
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| Authors: | D M D'Costa J Palmer A Hogg C Turney L K Fifield J Ogden |
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| Institution: | 1. School of Geography, Geology and Environmental Science, University of Auckland, Auckland, New Zealand;2. Gondwana Tree Ring Laboratory, Little River, Canterbury, New Zealand;3. Radiocarbon Dating Laboratory, University of Waikato, Hamilton, New Zealand;4. GeoQuEST Research Centre, School of Earth and Environmental Sciences, University of Wollongong, Wollongong, New South Wales, Australia;5. Department of Nuclear Physics, Research School of Physical Science and Engineering, Australian National University, ACT, Australia |
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| Abstract: | Johnston's Gum Hole provides a discontinuous pollen record commencing late in Marine Isotope Stage 5 (MIS 5). In combination with other published records from the region, the Aupouri Peninsula is reconstructed to have been continuously forested through much of the last glacial cycle with the oscillation of Agathis‐ and Nothofagus‐dominated forest corresponding to stadials and interstadials, respectively. A northward latitudinal expansion of beech forest to 35° S is demonstrated. Kauri demise at the close of MIS 5 appears to have been due to flooding of the site. The elimination of kauri in MIS 3 was also associated with rewetting of the substrate, but could have been a more catastrophic event. The presence of both MIS 5 and MIS 3 kauri wood at the site suggests that other Aupouri peat swamps may also preserve timber of these ages, and demonstrate the potential of this area for providing MIS 3 and MIS 5 tree ring records. Copyright © 2008 John Wiley & Sons, Ltd. |
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| Keywords: | Quaternary pollen fossil kauri Johnston's Gum Hole New Zealand |
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