Wellington Quaternary palynology : Aranuian and Otiran pollen diagrams from Soil Bureau site, Taita and Wallaceville Swamp, Hutt Valley, New Zealand

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Harris, W.F.; Mildenhall, D.C. 1984 Wellington Quaternary palynology : Aranuian and Otiran pollen diagrams from Soil Bureau site, Taita and Wallaceville Swamp, Hutt Valley, New Zealand. Lower Hutt: New Zealand Geological Survey. New Zealand Geological Survey report PAL 69. 27 p

Abstract: Pollen samples from a profile at Taita indicate a grassland environment prior to and immediately after the deposition of the Aokautere Ash (Kawakawa Tephra) approximately 21,000 years B.P. This grassland gradually gave way to a Nothofagus menziesii montane forest followed by an abrupt change to a N. `fusca' group dominant forest which continues to the top of the section. The top few centimetres of the profile may have been deposited in post-European time. The abrupt change in the species of beech represents an unconformity of unknown duration. Pollen samples from a number of profiles at Mangaroa (Wallaceville Swamp) indicate a change from a cool environment (Gramineae plus Phyllocladus ) through successive phases of Nothofagus menziesii, Podocarpus species, Dacrydium cupressinum to Nothofagus `fusca' group close to the present day. These results are presented in an historical context based on notes left by Dr W.F. Harris, supplemented with additional data by the junior author