A5068341534- Geology and Paleoclimatology Research
- Geological formations and processes
- Paleontology and Stratigraphy of Fossils
- Plant Diversity and Evolution
- Paleontology and Evolutionary Biology
- Geological and Geophysical Studies
- Evolution and Paleontology Studies
- Botany, Ecology, and Taxonomy Studies
- Geological and Geochemical Analysis
- Hydrocarbon exploration and reservoir analysis
- Botany and Plant Ecology Studies
- Coastal wetland ecosystem dynamics
- Geochemistry and Geologic Mapping
- Peatlands and Wetlands Ecology
- Aeolian processes and effects
- Hydrology and Sediment Transport Processes
- Ecology and Vegetation Dynamics Studies
- Marine Biology and Ecology Research
- Fire effects on ecosystems
- Plant and Fungal Species Descriptions
- Geological Modeling and Analysis
- Coal and Its By-products
- Botanical Research and Applications
- Cephalopods and Marine Biology
- Plant and animal studies
Colby College
2015-2024
National Museum of Natural History
2000-2024
Smithsonian Institution
2000-2024
University of Pennsylvania
2000-2001
American Museum of Natural History
2000
Whitney Museum of American Art
2000
Yale University
2000
University of Tennessee at Knoxville
2000
University of Oregon
2000
Weston College
2000
Taphonomy plays diverse roles in paleobiology. These include assessing sample quality relevant to ecologic, biogeographic, and evolutionary questions, diagnosing the of various taphonomic agents, processes circumstances generating sedimentary fossil records, reconstructing dynamics organic recycling over time as a part Earth history. Major advances past 15 years have occurred understanding (1) controls on preservation, especially ecology biogeochemistry soft-tissue dominance bi- ological...
▪ Abstract Late Carboniferous and Early Permian strata record the transition from a cold interval in Earth history, characterized by repeated periods of glaciation deglaciation southern pole, to warm-climate interval. Consequently, this time period is best available analogue Recent which study patterns vegetational response, both glacial-interglacial oscillation appearance warm climate. wetland ecosystems were dominated spore-producing plants early gymnospermous seed plants. Global climate...
Taphonomy plays diverse roles in paleobiology. These include assessing sample quality relevant to ecologic, biogeographic, and evolutionary questions, diagnosing the of various taphonomic agents, processes circumstances generating sedimentary fossil records, reconstructing dynamics organic recycling over time as a part Earth history. Major advances past 15 years have occurred understanding (1) controls on preservation, especially ecology biogeochemistry soft-tissue dominance biological...
The end-Permian extinction records the greatest ecological catastrophe in Earth history. vertebrate fossil record Karoo Basin, South Africa, has been used for more than a century as standard understanding turnover terrestrial ecosystems, recently claimed to be synchrony with marine crisis. Workers assumed that systematic at Dicynodon assemblage zone boundary, followed by appearance of new taxa directly above base Lystrosaurus zone, is continental expression event and recovery. To test this...
Abstract The current model for the end-Permian terrestrial ecosystem crisis holds that systematic loss exhibited by an abrupt turnover from Daptocephalus to Lystrosaurus Assemblage Zone (AZ; Karoo Basin, South Africa) is time equivalent with marine Permian–Triassic boundary (PTB). event began at 251.941 ± 0.037 Ma, PTB placed 251.902 0.024 Ma (2σ). Radio-isotopic dates over this interval in Basin were limited one high resolution ash-fall deposit upper AZ (253.48 0.15 (2σ) Ma) no similar age...
Abstract The terrestrial crisis that reportedly parallels the P/Tr marine mass extinction is based mainly on Northern Hemisphere microfloral assemblages and Southern Gondwanan macrofloral collections. It well established taphonomic filters control ultimate collectable fossil assemblage in any depositional regime. Recognition comparison of isotaphonomic are critical before conclusions can be drawn about evolutionary trends over time. Such an approach has been taken investigation pre-boundary,...
Evidence for regenerative growth in fossil plants is limited to reports of wound repair caused by plant‐animal interactions. No paleobotanical data, date, have documented the capability ancient following trauma, particularly flood‐generated burial. An erect, situ equisetalean pith‐cast Late Carboniferous age has been discovered from which it can be demonstrated that horsetails possessed capabilities alluviation. The character and mode regeneration appears a homologue modern Equisetum...
Lower delta plains are primary sites for the deposition, accumulation, and preservation of macrodetrital plant parts. Chacaloochee Bay, an interdistributary estuary in Mobile Delta, Alabama, is being infilled actively by crevasse-splay sedimentation. Within this system a variety which macrodetritus has accumulated potential preserved. Aerial parts constitute laminar leaf-litter beds within various sediments, addition to extensive accumulations relatively pure organics (peats). The...
The paleoecology of plants as a modern discipline, distinct from traditional floristics or biostratigraphy, has undergone an enormous expansion in the past 20 years. In addition to baseline studies characterizing extinct and plant assemblages terms their growth habits, environmental preferences, patterns association, converged on neoecology represents means extend our basic understanding world contribute theoretical framework ecology, writ large. Reconstruction whole plants, including...
Interregional correlation of the marine zones major cyclothems between North America and eastern Europe does not support assertions that a stratigraphic gap exists traditional regional Desmoinesian Missourian stages in America. Such was previously proposed to explain an abrupt change megafloral assemblages northern Appalachian Basin by extension across all Conodont-based from essentially complete low-shelf Midcontinent succession (distal highstand shoreline), through mid-shelf Illinois...
Research Article| March 01, 2009 The terrestrial Permian-Triassic boundary event bed is a nonevent Robert A. Gastaldo; Gastaldo 11Department of Geology, Colby College, Waterville, Maine 04901, USA Search for other works by this author on: GSW Google Scholar Johann Neveling; Neveling 22Council Geosciences, Private Bag x112, Silverton, Pretoria 0001, South Africa C. Kittinger Clark; Clark Sophia S. Newbury Author and Article Information Publisher: Geological Society America Received: 13 Jun...
Abstract The earliest evidence of wildfire is documented from two localities: the early mid-Silurian Pen-y-lan Mudstone, Rumney, Wales (UK), and late Silurian Winnica Formation, Winnica, Poland. Nematophytes dominate both charcoal assemblages. Reflectance data indicate low-temperature fires with localized intense conditions. Fire temperatures are greater in older less evolved assemblage. These assemblages others, new previously documented, Devonian compared to box models atmospheric oxygen...
The Mahakam River delta is a tide- and wave-dominated located on the edge of Kutei basin, eastern Kalimantan, Borneo. It coastal deltaic sequence, Neogene to Holocene in age, from which all recoverable hydrocarbons (crude oil natural gas) are considered be derived kerogen III predecessors. However, complete understanding types sediments sourcing has not yet been achieved. A vibracoring program sampled principal fine-grained depositional environments two transects; one within...
This paper tests whether the most common fossil brachiopod, gastropod, and bivalve genera also have intrinsically more durable shells. Commonness was quantified using occurrence frequency of 450 frequently occurring these groups in Paleobiology Database (PBDB). Durability scored for each taxon on basis shell size, thickness, reinforcement (ribs, folds, spines), mineralogy, microstructural organic content. Contrary to taphonomic expectation, PBDB are as likely be small, thin-shelled,...