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dc.contributor.advisorLee, Daphne
dc.contributor.advisorDickinson, Kath
dc.contributor.authorJackson, Joseph Adey
dc.date.available2016-04-04T03:12:03Z
dc.date.copyright2016
dc.identifier.citationJackson, J. A. (2016). A Study Of Plant Fossils From Landslip Hill Silcrete (Thesis, Master of Science). University of Otago. Retrieved from http://hdl.handle.net/10523/6328en
dc.identifier.urihttp://hdl.handle.net/10523/6328
dc.description.abstractThe Miocene Landslip Hill silcrete from Southland, southern New Zealand is a fluvial deposit consisting of quartz sand cemented by amorphous silica, in which numerous randomly oriented three-dimensional plant fossils are preserved as moulds. Leaf fossils include one fern, at least three conifer morphotypes, one monocot and about 30 distinct angiosperm leaf morphotypes with dicotyledonous or magnoliid affinities. Additionally, eight different fruit or seed types are recognised. Some morphotypes have affinities with Araucariaceae, Podocarpaceae, Nothofagaceae, Casuarinaceae, Elaeocarpaceae and Lauraceae. Quantitative paleoclimate estimates for temperature and precipitation variables were obtained by cross-correlating physiognomic variation of dicotyledonous and magnoliid leaf morphotypes with two pre-existing modern leaf assemblage calibration datasets using the Climate Leaf Analysis Multivariate Program (CLAMP). Monthly temperature and precipitation values resemble modern Auckland, New Zealand, with average temperatures of warmest months of 21°C versus a modern 19°C, cold month averages of 11°C versus 10°C and an annual average of 16°C versus modern 15°C. Paleo-precipitation estimates are similar, as the three wettest months average 146 mm per month versus a modern 130 mm and the average of three driest months is 60 mm versus 80 mm per month. An inferred mean annual precipitation of 1300 mm versus 1210 mm in modern Auckland is also indicated. The Miocene Landslip Hill silcrete contains a diverse floral assemblage which is inferred to have grown in a much warmer and more humid climate than occurs in present day Southland, New Zealand. Prevailing conditions would have been a relatively moderate average annual precipitation with relatively little seasonal variation and a more or less year-round growing season.
dc.language.isoen
dc.publisherUniversity of Otago
dc.rightsAll items in OUR Archive are provided for private study and research purposes and are protected by copyright with all rights reserved unless otherwise indicated.
dc.subjectNew Zealand
dc.subjectGeology
dc.subjectPaleontology
dc.subjectClimate
dc.subjectFossil
dc.subjectSilcrete
dc.titleA Study Of Plant Fossils From Landslip Hill Silcrete
dc.typeThesis
dc.date.updated2016-04-04T00:40:13Z
dc.language.rfc3066en
thesis.degree.disciplineGeology
thesis.degree.nameMaster of Science
thesis.degree.grantorUniversity of Otago
thesis.degree.levelMasters
otago.interloanyes
otago.openaccessAbstract Only
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