A5080034613- Geology and Paleoclimatology Research
- Paleontology and Stratigraphy of Fossils
- Geological formations and processes
- Geological and Geochemical Analysis
- Geological and Geophysical Studies
- Polar Research and Ecology
- Geochemistry and Geologic Mapping
- Geochemistry and Elemental Analysis
- Evolution and Paleontology Studies
- Geological and Tectonic Studies in Latin America
- Cryospheric studies and observations
- Plant Diversity and Evolution
- Geological Studies and Exploration
- Marine and environmental studies
- Paleontology and Evolutionary Biology
- Geography and Environmental Studies
- Marine Biology and Ecology Research
- Ichthyology and Marine Biology
- earthquake and tectonic studies
- Geophysical and Geoelectrical Methods
- Morphological variations and asymmetry
- Groundwater and Isotope Geochemistry
- Coastal wetland ecosystem dynamics
- Geological and Geophysical Studies Worldwide
- Fish biology, ecology, and behavior
University of Wisconsin–Milwaukee
2015-2024
University of Wisconsin System
2023
University of California, Davis
2007
National Museum of Natural History
2007
University of Nebraska–Lincoln
2007
Southern Methodist University
2007
The Ohio State University
1990
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 ,...
Research Article| September 01, 2010 High-precision U-Pb calibration of Carboniferous glaciation and climate history, Paganzo Group, NW Argentina E.L. Gulbranson; Gulbranson † 1Department Geology, University California, One Shields Avenue, Davis, California 95616, USA †E-mail: gulbranson@geology.ucdavis.edu Search for other works by this author on: GSW Google Scholar I.P. Montañez; Montañez M.D. Schmitz; Schmitz 2Department Geosciences, Boise State University, Isotope Geology Laboratory,...
Research Article| January 04, 2018 A new stratigraphic framework built on U-Pb single-zircon TIMS ages and implications for the timing of penultimate icehouse (Paraná Basin, Brazil) Neil Patrick Griffis; Griffis † 1Department Earth Planetary Sciences, University California, Davis, California 95616, USA †npgriffis@ucdavis.edu Search other works by this author on: GSW Google Scholar Roland Mundil; Mundil 2Berkeley Geochronology Center, Berkeley, 94709, Isabel Patricia Montañez; Montañez John...
Abstract The demise of the Late Paleozoic Ice Age has been hypothesized as diachronous, occurring first in western South America and progressing eastward across Africa culminating Australia over an ∼60 m.y. period, suggesting tectonic forcing mechanisms that operate on time scales 106 yr or longer. We test this diachronous deglaciation hypothesis for southwestern south-central Gondwana with new single crystal U-Pb zircon chemical abrasion thermal ionizing mass spectrometry (CA-TIMS) ages...
Research Article| November 01, 2003 Reevaluation of the timing and extent late Paleozoic glaciation in Gondwana: Role Transantarctic Mountains John L. Isbell; Isbell 1Department Geosciences, University Wisconsin, Milwaukee, Wisconsin 53201, USA Search for other works by this author on: GSW Google Scholar Paul A. Lenaker; Lenaker Rosemary Askin; Askin 2Byrd Polar Center, Ohio State University, Columbus, 43210, Molly F. Miller; Miller 3Department Earth Environmental Science, Vanderbilt...
The most complete Permian–Triassic Gondwana succession in Antarctica crops out the central Transantarctic Mountains. lower Permian strata were deposited an intracratonic basin that evolved into a foreland late time. Sedimentary petrology and paleocurrent data have been interpreted as indicating granitic (craton) provenance West Antarctic volcanic provenance. To address evolution of detrital input, detrital-zircon grains from nine sandstones (plus three reported previously) representing full...
The late Paleozoic ice age (LPIA) was the longest-lived glaciation of Phanerozoic, and demise LPIA is Earth’s only recorded transition from an icehouse to a greenhouse state. P1 (Asselian-Sakmarian) most extensive phase LPIA, characterized by rapid climate change several significant events, including widespread aridification in low latitudes Pangaea, episodic glacial expansion Gondwana, considerable fluctuations CO2 concentrations. This study investigates early Asselian warming...
Other| June 01, 2001 Tetrapod and Large Burrows of Uncertain Origin in Triassic High Paleolatitude Floodplain Deposits, Antarctica MOLLY F. MILLER; MILLER 1Department Geology, Vanderbilt University, Nashville, TN 37235 Search for other works by this author on: GSW Google Scholar STEPHEN T. HASIOTIS; HASIOTIS 2Department Geography, Anthropology, Indiana State Terre Haute, IN 47809 LOREN E. BABCOCK; BABCOCK 3Department Geological Sciences Byrd Polar Research Center, The Ohio Columbus, OH 43210...