A5002712927- Geology and Paleoclimatology Research
- Paleontology and Stratigraphy of Fossils
- Geological and Geochemical Analysis
- Geological formations and processes
- Evolution and Paleontology Studies
- Plant Diversity and Evolution
- Paleontology and Evolutionary Biology
- Geochemistry and Elemental Analysis
- Hydrocarbon exploration and reservoir analysis
- Groundwater and Isotope Geochemistry
- Geochemistry and Geologic Mapping
- Clay minerals and soil interactions
- Geological Studies and Exploration
- Geological and Geophysical Studies
- Pleistocene-Era Hominins and Archaeology
- Atmospheric and Environmental Gas Dynamics
- Rangeland Management and Livestock Ecology
- Isotope Analysis in Ecology
- Geological and Geophysical Studies Worldwide
- Ichthyology and Marine Biology
- Plant and animal studies
- Plant and Fungal Species Descriptions
- Geological and Tectonic Studies in Latin America
- African history and culture analysis
- Botany, Ecology, and Taxonomy Studies
Southern Methodist University
2015-2024
Research Experiences for Undergraduates
2021-2024
U.S. National Science Foundation
2021-2024
University of California, Davis
1999-2007
National Museum of Natural History
2007
University of Nebraska–Lincoln
2007
The University of Texas at Austin
2006
Geological Society of America
2006
Ruhr University Bochum
2004
Carleton University
2004
The late Paleozoic deglaciation is the vegetated Earth's only recorded icehouse-to-greenhouse transition, yet climate dynamics remain enigmatic. By using stable isotopic compositions of soil-formed minerals, fossil-plant matter, and shallow-water brachiopods, we estimated atmospheric partial pressure carbon dioxide ( p CO 2 ) tropical marine surface temperatures during this transition. Comparison to southern Gondwanan glacial records documents covariance between inferred shifts in ,...
A 400 record of atmospheric carbon dioxide levels has been estimated by applying a CO{sub 2} paleobarometer to database 758 analyses paleosol (fossil soil) carbonates. This is compilation new data and previously published values from the literature. Many Mesozoic paleosols are reported, an era poorly represented in Results indicate that large fluctuations have occurred over study interval, ranging current level up ten times level. Declining pCO{sub through middle Paleozoic culminate low...
Paleosols are ancient soils that have been incorporated into the geological record. Soils form in response to interactions among lithosphere, hydrosphere, biosphere, and atmosphere, so paleosols potentially record physical, biological, chemical information about past conditions near Earth's surface. As a result, an important resource for terrestrial environmental climatic reconstructions. Long-standing paleosol research topics include morphology, classification, clay mineralogy, all of which...
Research Article| March 01, 2005 Middle Miocene paleoaltimetry of southern Tibet: Implications for the role mantle thickening and delamination in Himalayan orogen Brian S. Currie; Currie 1Department Geology, 114 Shideler Hall, Miami University, Oxford, Ohio 45056, USA Search other works by this author on: GSW Google Scholar David B. Rowley; Rowley 2Department Geophysical Sciences, 5734 South Ellis Avenue, University Chicago, Illinois 60637, Neil J. Tabor 3Department Geological Southern...
ABSTRACT The late Paleozoic earth experienced alternation between glacial and non‐glacial climates at multiple temporal scales, accompanied by atmospheric CO 2 fluctuations global warming intervals, often attended significant vegetational changes in equatorial latitudes of Pangaea. We assess the nature climate–vegetation interaction during two time intervals: middle–late Pennsylvanian transition Pennsylvanian–Permian transition, each marked tropical drying. In case study 1, there is a...
Research Article| January 01, 2013 Hot summers in the Bighorn Basin during early Paleogene Kathryn E. Snell; Snell * 1Earth and Planetary Sciences Department, University of California, 1156 High Street, Santa Cruz, California 95064, USA2Department Geological Sciences, Institute Technology, 1200 Boulevard, Pasadena, 91125, USA *E-mail: ksnell@caltech.edu. Search for other works by this author on: GSW Google Scholar Bridget L. Thrasher; Thrasher John M. Eiler; Eiler 2Department Paul Koch; Koch...
Abstract Analysis of stacked Permo‐Pennsylvanian palaeosols from north‐central Texas documents the influence palaeolandscape position on pedogenesis in aggradational depositional settings. Palaeosols Eastern shelf Midland basin exhibit stratigraphic trends distribution soil horizons, structure, rooting density, clay mineralogy and colour that record long‐term changes soil‐forming conditions driven by both local processes regional climate. similar to modern histosols, ultisols, vertisols,...
The two vertebrate fossil assemblages from the ?Middle Triassic Ntawere Formation have been known since 1960s, but little new work has done description of novel taxa in 1960s and 1970s. Three recent field seasons increased diversity upper assemblage expanded biostratigraphic connections between lower fossiliferous basins across southern Pangea. contains hybodontoid sharks, ptychoceratodontid lungfish, large- small-bodied stereospondyl amphibians (Cherninia, 'Stanocephalosaurus,'...
Research Article| December 01, 2002 Shifts in late Paleozoic atmospheric circulation over western equatorial Pangea: Insights from pedogenic mineral δ18O compositions Neil J. Tabor; Tabor 1Department of Geology, One Shields Avenue, University California, Davis, California 95616, USA Search for other works by this author on: GSW Google Scholar Isabel P. Montañez Geology (2002) 30 (12): 1127–1130. https://doi.org/10.1130/0091-7613(2002)030<1127:SILPAC>2.0.CO;2 Article history received: 16 May...
Conceptual energy‐based pedogenic models present a framework for quantitatively linking pedon energy throughflow to soil development. In this study, we utilized quantitative model (QPEM) based on rates of effective and mass transfer (EEMT, kJ m −2 yr −1 ) the system predict pedogenesis across wide range environments. Our objectives were to: (i) derive global equation estimating EEMT; (ii) test QPEM at scale series environmental gradients igneous rock residuum; (iii) develop functions between...
Abstract The morphology, mineralogy, and stratigraphic lateral distribution of paleosols in Pennsylvanian (Moscovian–Gzhelian; Atokan–Virgilian) mixed marine terrestrial coal-bearing strata (i.e., cyclothems) the Illinois basin (IB) are presented order to determine dominant pedogenic processes within a cyclic sedimentary depositional framework. Paleosol morphologies range from weakly developed horizons with evidence rooting little no structure, well-developed slickensides, angular blocky...