A5065448327- Geology and Paleoclimatology Research
- Plant Diversity and Evolution
- Paleontology and Stratigraphy of Fossils
- Evolution and Paleontology Studies
- Peatlands and Wetlands Ecology
- Geological formations and processes
- Botany, Ecology, and Taxonomy Studies
- Ecology and Vegetation Dynamics Studies
- Hydrocarbon exploration and reservoir analysis
- Geological and Geophysical Studies
- Botany and Plant Ecology Studies
- Species Distribution and Climate Change
- Rangeland and Wildlife Management
- Wildlife Ecology and Conservation
- Paleontology and Evolutionary Biology
- Fire effects on ecosystems
- Geological Studies and Exploration
- Marine and environmental studies
- Coal and Its By-products
- Pleistocene-Era Hominins and Archaeology
- Ichthyology and Marine Biology
- Aeolian processes and effects
- Isotope Analysis in Ecology
- Pasture and Agricultural Systems
- Animal Diversity and Health Studies
Smithsonian Institution
2020-2024
The University of Melbourne
2016-2024
National Museum of Natural History
2020-2024
Abstract Most studies of the response terrestrial vegetation to climate change during Paleocene‐Eocene Thermal Maximum (PETM) have focused on individual sites and sections. To get a broader perspective we compiled published records pollen spores across transition at 38 around globe. For 10 with quantitative data PETM palynofloras were largely distinct in composition from those latest Paleocene or post‐PETM early Eocene. We also inferred paleoclimatic conditions each site distributions...
The Paleocene-Eocene Thermal Maximum (PETM) around 56 million years ago was a 5-6°C global warming event, representing one of the most important geologic analogues to present-day climate change. Considering that carbon release rate triggered PETM likely magnitude lower than current anthropogenic emissions, it is major importance identify climatic, and biological factors drove severity 200 kyr long duration hyperthermal. Based on isotope records period, suggested loss 70-100 lagged...
Palynology is used to provide new age controls for the coastal exposures yielding Early Cretaceous vertebrate faunas in Otway and Gippsland basins, southeast Australia. This work shows all vertebrate-bearing deposits Basin are Albian age. On eastern margin of Cape Otway, attributed early Crybelosporites striatus Zone, except one younger Coptospora paradoxa Zone. To west sampled range from oldest zone Albian, C. Phimopollenites pannosus zones, providing a complete section stage. In Basin,...
Abstract Plant megafossils from the Paleocene-Eocene Thermal Maximum (PETM) in Bighorn Basin, north-central Wyoming, USA, document a dramatic shift floral composition, whereas palynofloral change same sections has appeared to be more subtle. We investigated this discrepancy by quantifying pollen preservation and measuring stable carbon isotope composition of specific taxa. Pollen grains belonging two common latest Paleocene taxa are poorly preserved PETM samples, their δ13Cpollen is similar...
Multiple stable isotope investigations from upper Eocene to lower Oligocene deep-water marine sequences record the transition global greenhouse icehouse conditions (Oi-1 glacial). While Southern Ocean high latitude deep sea records of this are well known, their shallow equivalents rare and have potential eustatic oceanic consequences Paleogene glacial variability. The well-known paleolatitude (~55°S) neritic carbonate sequence at Browns Creek Castle Cove in Otway Basin southeast Australia...
Abstract: Peats are commonly used in paleoenvironmental and paleoclimatic studies but detailed sedimentological facies models for peatlands poorly developed relative to other sedimentary settings. A comparison of the palynology charcoal abundances modern ancient Cenozoic peats (i.e., brown coals) demonstrates that, a single cycle, their respective flora evolves from inundated wetland assemblages more elevated well-drained forest. The repetitive nature this pattern suggests that changing...
The Southern Hemisphere family Casuarinaceae has a long fossil record, both macrofossils and pollen, none of which provides any evidence about the morphology precursor to family. However, it been considered, from molecular phylogenies morphological data, that extant genus Gymnostoma retains key ancestral states highly reduced leaf area is result scleromorphic response low soil nutrients. by far earliest, most extensive best preserved macrofossil beginning in Late Paleocene. Modification...
Abstract To better understand the effect of Paleocene‐Eocene Thermal Maximum (PETM) on continental ecosystems, we studied 40 new palynological samples from Bighorn Basin (BHB), northwestern Wyoming, USA. We see palm and fern abundances increase in last 20–40 ka Paleocene, then dramatically with onset carbon isotope excursion (CIE) defining base PETM. Palynomorphs plant groups modern temperate climate distributions are absent CIE body, this is when tropical plants most diverse abundant....
ABSTRACT Floral Lagerstätten deposits (i.e., fossil sites with exceptional preservation and diversity) are preserved within the Miocene brown coals of Latrobe Group, Gippsland Basin, Australia. Three independent mechanisms conducive to their accumulation. Throughout coal seams conversion plant material into charcoal (fusain) its accumulation in a subaqueous setting provides one means near-perfect preservation. A second more uncommon example occurs form 20 cm thick leaf-litter horizon that...
Abstract Pollen preserved in caves provides a little-appreciated opportunity to study past vegetation and climate changes regions where conventional wetland sediments are either unavailable, contain little organic matter, and/or difficult date accurately. Most palynology has focused on clastic infill sediments, but pollen growing speleothems important new opportunities develop climatic records that can be dated accurately with radiometric methods. However, when is present speleothems,...
Pollen and spores were recovered from the Paleocene Fort Union Formation Paleocene–Eocene Willwood of Bighorn Basin (BHB), northwestern Wyoming, USA. In many local stratigraphic sections in BHB, base Eocene has been identified by characteristic negative carbon isotope excursion (CIE) that marks beginning Thermal Maximum (PETM). The palynotaxa outcrop samples examined using light microscopy (LM) scanning electron (SEM). Seven new species are formally described (Tricolpites vegrandis, Rousea...
Abstract The Australian monsoon is part of the global and often included as a component Asian Monsoon system although they operate out phase. Due to their hemispheric positions, dry (wet) winter (summer) coincides with wet summer vice versa. controls rainfall distribution in northern tropical Australia where over 80% median annular occurs from December March, season. Three types are distinguished based on distinct atmospheric circulation heating patterns: northwest Pseudo-Monsoon , northeast...