ORCID Profile
0000-0003-1848-6961
Current Organisations
The University of Western Australia Faculty of Science
,
Geoscience Australia
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Publications
Lauraceae fossils from a volcanic Palaeocene oceanic island, Ninetyeast Ridge, Indian Ocean: ancient long-distance dispersal?
Publisher: Wiley
Date: 02-03-2010
Early Tertiary palaeogeography, landform evolution, and palaeoclimates of the Southern Monaro, N.S.W., Australia
Publisher: Elsevier BV
Date: 05-1990
Distribution and provenance of recycled palynomorphs in surficial sediments of the Ross Sea, Antarctica
Publisher: Elsevier BV
Date: 07-1984
Vegetation in the Australian Tertiary in Response to Climatic and Phytogeographic Forcing Factors*
Publisher: CSIRO Publishing
Date: 1993
DOI: 10.1071/SB9930533
Abstract: Nancy Burbidge's 1960 paper on the phytogeography of the Australian region would make a fitting starting point for a review of the impact of the plant fossil record on understanding Australian vegetation history. However, a number of reviews were published in the late 1970s and early 1980s, so that the present overview takes its starting point from that time and considers the advances in research since then. In the interval since, information has accrued from both palynology and plant macrofossils, so that the fossil evidence must now be considered a primary source of data for interpreting the evolution of Australian vegetation. There have also been major advances in understanding the geological framework of the Tertiary, against which the fossil data must be set. For instance, the timescale against which advances must be measured has been refined, there have been comprehensive syntheses of Tertiary palaeogeography, and a better understanding of the relationships, through time, of Australia with continents to the north, and between Australia and Antarctica. Our understanding of the climatic factors affecting the continent and its vegetation has also improved. The record now available, in spite of its many limitations, gives a general picture of transition from widespread, very erse rainforests in the early Tertiary, to predominantly open vegetation with rainforest restricted to wetter regions. Some aspects of the early forests remain insufficiently understood for instance, the effects of high latitude position on forest growth. The development of sclerophylly may go back as far as the Eocene, with Banksia and Acacia now having records that extend back that far. The development of open vegetation types was probably linked with changing fire regimes we know that by the mid-Miocene, heath-like vegetation was established locally in coal sw s. Rainforests of drier aspect were established early too, probably first at inland localities, and there are hints of wet sclerophyll forest by the late Miocene. The history of grasslands and savannah remains sketchy, and no modem analogues can be identified for vegetation types in the Pliocene that were rich in Asteraceae and grasses. The history of the eucalypts, and their links to specific fire regimes, is a more recent story.* The Nancy Burbridge Memorial Lecture, which was presented at the 'Southem Temperate Ecosystems' conference, held in Hobart, Tasmania, 18–22 January 1993.
Polar forests on the edge of extinction: what does the fossil spore and pollen evidence from East Antarctica say?
Publisher: CSIRO Publishing
Date: 2009
DOI: 10.1071/SB08046
Abstract: Diverse pollen and spore assemblages, spanning the Late Eocene preglacial–glacial transition, have been recovered from Ocean Drilling Program cores from Prydz Bay, East Antarctica. These microfloras are mostly in situ and provide an unparalleled record of terrestrial plant communities growing in Antarctica during the earliest stages of ice-cap formation. The evidence provides a basis for assessing the phytogeographic relationships of the Antarctic floras with other high-latitude floras in the southern hemisphere, including possible migration routes for some taxa. Preliminary studies (Macphail and Truswell 2004a) suggested the Late Eocene vegetation at Prydz Bay was floristically impoverished rainforest scrub, similar to Nothofagus–gymnosperm communities found near the climatic treeline in Patagonia and Tasmania. Re-evaluation of the microfloras indicates the ersity of shrubs, especially Proteaceae, was underestimated and the Late Eocene vegetation was a mosaic of dwarfed (krumholtz) trees, scleromorphic shrubs and wetland herbs, analogous to the taiga found in the transition zone between the boreal conifer forest and tundra biomes across the Arctic Circle. Microfloras similar to although much less erse than the Prydz Bay assemblages occur in coreholes from the Ross Sea region on the opposite side of Antarctica. Interpretation of the latter is complicated by reworking and low yields but the combined evidence points to the collapse of taller woody ecosystems during the Eocene–Oligocene transition and their replacement by tundra-like or fell-field vegetation during the Oligocene and Neogene. This temperature-forced regression seems to have been broadly synchronous across the continent. The high-palaeolatitude location (~70°S) means that the Prydz Bay flora was adapted to several months of winter darkness and short-summer growing seasons. The nearest living relatives of identifiable woody taxa suggest year-round high humidity, with an annual precipitation between ~1200 and 1500 mm. Palaeotemperatures are more difficult to quantify although the inferred humid microtherm climate is consistent with mean annual temperatures less than 12°C and freezing winters.
Density functional orbitals in quantum Monte Carlo: The importance of accurate densities
Publisher: AIP Publishing
Date: 09-05-2019
DOI: 10.1063/1.5095158
Abstract: There has been significant recent attention surrounding the accuracy of electronic densities produced by modern parameterized density functional approximations (DFAs). Here, we investigate the impact of using orbitals from density functional calculations in fixed-node Diffusion Monte Carlo (DMC) methods, which is common practice in the calculation of large systems. We find that the accuracy of the density is a strong indicator of the quality of the many-body nodal surface produced by a determinant of the corresponding Kohn-Sham orbitals. Functionals which produce the most accurate electronic densities also produce the lowest variational DMC energies, while functionals that produce poor densities lead to significantly higher energies. This result simplifies the process of choosing orbitals for DMC calculations of large systems and suggests that prioritizing accurate densities in the future development of DFAs would also contribute to the continued improvement of DMC.
Palynomorph assemblages from marine Eocene sediments on the west Tasmanian continental margin and the South Tasman Rise
Publisher: Informa UK Limited
Date: 10-1997
A Memory of Ice: The Antarctic Voyage of the Glomar Challenger
Publisher: ANU Press
Date: 2019
DOI: 10.22459/MI.2019
Palynology of seafloor samples collected by the 1911–14 Australasian Antarctic expedition: Implications for the geology of coastal East Antarctica
Publisher: Informa UK Limited
Date: 10-1982
Late Miocene vegetation and palaeoenvironments of the Drygalski Formation, Heard Island, Indian Ocean: evidence from palynology
Publisher: Cambridge University Press (CUP)
Date: 17-08-2005
DOI: 10.1017/S0954102005002865
Abstract: Well sorted, fine lithic sandstone within the Drygalski Formation at Cape Lockyer on the southern tip of Heard Island, preserves a erse terrestrial palynoflora as well as marine diatoms and a few foraminifera. A combination of these elements suggests a Late Miocene age (10–5 Ma). The palaeovegetation was markedly different from that presently on the island, and appears to comprise at least two ecologically distinct communities: open heath or herbfield dominated by grasses and Asteraceae, and a more mesophytic community dominated by ferns but also including lycopods and angiosperms such as Gunnera . This may have represented a coastal flora similar to the ‘fern-bush’ community that exists now on Southern Ocean islands north of the Antarctic Polar Frontal Zone, and in Tierra del Fuego however, there is no evidence of tree species in the local flora and trace amounts of tree pollen present may have blown in from other landmasses in the region.
Apatite fission-track age patterns in antarctica: Comparison with Southern Australia
Publisher: Informa UK Limited
Date: 1979
Cool climate bauxite
Publisher: Elsevier BV
Date: 07-1990
Reliable radical stabilization energies from diffusion Monte Carlo calculations
Publisher: Wiley
Date: 11-08-2020
DOI: 10.1002/JCC.26397
Related Organisations
The University Of Western Australia Faculty Of Science
Location: Australia
Related Funding Activities
No related grants have been discovered for Elizabeth Truswell.