Stratigraphy,pollen analysis and paleoclimatic interpretation of Mowrray and Rroadmeadows Swamps,North Western Tasmania |
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| Authors: | G. van de Geer E. A. Colhoun W. G. Mook |
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| Affiliation: | 1. Department of Geography , University of Tasmania , GPO Box 252C, Hobart , Tasmania, 7001;2. Department of Geography , University of Newcastle , NSW, 2308;3. Isotope Physics Laboratory , Groningen University , Groningen , The Netherlands |
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| Abstract: | Sedimentary, palynologic and 14C analysis of marls and swamp‐peats, formed under fluctuating artesian spring conditions, provide climate and vegetation records from >52,000 to 0 yr BP at Mowbray, and 30,000 to 0 yr BP at Broadmeadows. Before about 65,000 yr BP conditions at Mowbray were relatively dry and the vegetation was Leptospermum shrubland. After 65,000 and before 55,000 yr BP moist conditions produced Cyperaceae swamps. Between 55,000 and 45,000 yr BP the climate was relatively dry, and between 45,000 and 35,000 yr BP relatively moist. Leptospermum shrubs were dominant in both periods. The climate was moist between 35,000 and 22,000 yr BP and sedge swamps formed. Between 22,000 and 11,000 yr BP the climate was relatively dry and grasses were important. Postglacial climate (11,000–0 yr BP) was warm and moist, and Melaleuca‐Leptospermum forest and shrubland flourished. The climatic changes suggested for north western Tasmania seem to compare broadly with changes suggested for Tasmanian and for other southern Australian sites, but the correlation is limited by imprecise dating. |
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