GSA Home Page Denver 2004 - Geoscience in a Changing World

Topical Sessions

Technical Program Schedule

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T40 top Hydrogeomorphology, Chemistry, Archaeology, and Evolution of Coastal Plain Depressions and Related Features
GSA Hydrogeology Division; GSA Quaternary Geology and Geomorphology Division; GSA Sedimentary Geology Division
C. William Zanner, University of Nebraska, Lincoln, Nebr.; Andrew H. Ivester, University of West Georgia, Carrollton, Ga.
This session explores current understanding of the geomorphologic and hydrologic histories of Carolina bays and related depressional features. ORAL and POSTER
Hydrogeology; Quaternary Geology/Geomorphology; Stratigraphy
T41 top The Gulf of Mexico-Past, Present, and Future: Relating Ecology to Geology
GSA Quaternary Geology and Geomorphology Division; GSA Sedimentary Geology Division
Charles W. Holmes, Center for Coastal Geology, St. Petersburg, Fla.; John W. Tunnell, Harte Institute for Gulf of Mexico Research, Corpus Christi, Texas
The session's goal is twofold: (1) to update the status of geologic knowledge in the Gulf of Mexico, and (2) to relate the surface geologic processes to the ecology of various regions. ORAL and POSTER
Marine/Coastal Science; Environmental Geoscience; Quaternary Geology/Geomorphology
T42 top Authigenic Minerals in Modern and Ancient Terrestrial Aquatic Environments
GSA Limnogeology Division; GSA Sedimentary Geology Division, GSA Geobiology and Geomicrobiology Division
Daniel Larsen, University of Memphis, Memphis, Tenn.; Daniel Deocampo, California State University, Sacramento, Calif.
This session will present new ideas and concepts toward understanding and interpreting authigenic mineral processes in ancient and modern terrestrial aquatic environments, ranging from riverine or wetland to deep lacustrine settings. ORAL
Limnogeology; Sediments, Carbonates; Sediments, Clastic
T43 top Hydrologic and Paleoclimatic Significance of Nonmarine Microbial Carbonates (Tufas, Microbialites, Stromatolites and Thrombolites)
GSA Limnogeology Division; GSA Sedimentary Geology Division, GSA Geobiology and Geomicrobiology Division
Michael R. Rosen, U.S. Geological Survey, Carson City, Nev.; Robin Renaut, University of Saskatchewan, Saskatoon
This session explores the sedimentological record of nonmarine microbial carbonates and demonstrates the diversity of records that can be derived from these deposits. Emphasis is on lacustrine systems, but other nonmarine microbial carbonates will be considered. ORAL
Limnogeology; Sediments, Carbonates; Paleoclimatology/Paleoceanography
T44 top Lacustrine Records of Landscape Evolution
GSA Limnogeology Division; GSA Quaternary Geology and Geomorphology Division; GSA Sedimentary Geology Division
Jeffrey T. Pietras, BP Exploration Alaska, Inc., Anchorage, Alaska; Eric C. Carson, San Jacinto College, Houston, Texas; Alan R. Carroll, University of Wisconsin, Madison, Wis.
Lacustrine strata contain a bountiful archive of terrestrial geomorphic, tectonic, and climatic events. This session addresses the intersections of geomorphology, sedimentology, and stratigraphy for interpreting the lacustrine geologic record of terrestrial landscape change, focusing on the Cenozoic. ORAL
Limnogeology; Quaternary Geology/Geomorphology; Sediments, Clastic
T45 top Alkaline Evaporative Lakes and Playas: Insights into Microbial Physiology and Mineral Facies in Semiarid Settings
GSA Geobiology and Geomicrobiology Division; GSA Limnogeology Division; GSA Sedimentary Geology Division
David Finkelstein, Indiana University, Bloomington, Ind.; Thomas R. Kulp, U.S. Geological Survey, Menlo Park, Calif.; Lisa M. Pratt, Indiana University, Bloomington, Ind.
This session will elucidate the role of alkaline solutions in weathering, evaporite precipitation, and microbial physiology. Topics will focus on the geochemical and isotopic signatures of alkalaphilic microbes, mineral facies, and redox gradients. ORAL and POSTER
Geomicrobiology; Geochemistry, Aqueous; Limnogeology
T46 top Biomineralization in Terrestrial Hot Springs: The Preservation of Thermophiles in Past and Present-Day Systems
GSA Geobiology and Geomicrobiology Division; GSA Sedimentary Geology Division
Paul A. Schroeder, University of Georgia, Athens, Ga.; Sherry L. Cady, Portland State University, Portland, Ore.
This session invites those who study modern terrestrial hot springs with an eye for mineral-microbe relationships and how evidence for life might be preserved. Analog studies of ancient hot spring deposits are also welcomed. ORAL
Geomicrobiology; Paleontology/Paleobotany; Geochemistry, Aqueous
T47 top Ocean Chemistry through the Precambrian and Paleozoic
GSA Sedimentary Geology Division
Matthew R. Saltzman, The Ohio State University, Columbus, Ohio; Michael C. Pope, Washington State University, Pullman, Wash.
Considerable evidence reveals significant changes in the chemistry of the oceans during the Precambrian and Paleozoic. These changes have implications for Earth's climate and biosphere. We will focus on a combined data-modeling approach. ORAL
Paleoclimatology/Paleoceanography; Sediments, Carbonates; Geochemistry, Other
T48 top Unraveling the History of Ocean Crust Production: Evidence For and Against Changes in Seafloor Spreading Rates Since the Mesozoic
Jenney M. Hall, Yale University, New Haven, Conn.; David B. Rowley, University of Chicago, Chicago, Ill.; Mark Pagani, Yale University, New Haven, Conn.
This session invites evidence for and against changes in the rate of seafloor crust production as well as implications regarding the global carbon cycle and secular changes in seawater chemistry from both modeling results and empirical data. ORAL and POSTER
Paleoclimatology/Paleoceanography; Tectonics; Geochemistry, Other
T49 top Stable Isotopes in Fossils and Paleosols: Records of Late Cenozoic Environmental Change
GSA Sedimentary Geology Division
Yang Wang, Florida State University and National High Magnetic Field Laboratory, Tallahassee, Fla.; Pennilyn Higgins, University of Florida, Gainesville, Fla.
Stable isotope analysis has been established as a valuable tool for reconstructing past terrestrial environments. This session will examine isotopic records to better understand the links among biological, climatic, and tectonic change. ORAL
Geochemistry, Other; Paleoclimatology/Paleoceanography; Paleontology/Paleobotany
T50 top Marine Hard Substrates: Colonization and Evolution
Paleontological Society; GSA Sedimentary Geology Division
Stephen K. Donovan, National Natuurhistorisch Museum, Leiden, Netherlands; Paul D. Taylor, The Natural History Museum, London, United Kingdom
Marine hard substrates represent a distinct suite of habitats that have seen a range of evolutionary innovations during the Phanerozoic. This meeting will review new data and ideas on these ecosystems and their evolution. ORAL
Paleontology/Paleobotany; Marine/Coastal Science; Stratigraphy
T51 top Protistan Paleobiodiversity: Understanding Evolutionary Patterns
Cushman Foundation
Susan T. Goldstein, University of Georgia, Athens, Ga.; Brian T. Huber, Smithsonian Institution, Washington, D.C.
Rich and well-documented, the protistan fossil record provides the foundation for diverse global change studies. This session focuses on understanding the evolutionary mechanisms and phylogenetic relationships underpinning protistan biodiversity in modern and ancient systems. ORAL
Paleontology/Paleobotany; Paleoclimatology/Paleoceanography; Geomicrobiology
T52 top The Hunters and the Hunted: Predation On and By Gastropods
Paleontological Society
Patricia H. Kelley, University of North Carolina, Wilmington, N.C.; Thor A. Hansen, Western Washington University, Bellingham, Wash.; Gregory P. Dietl, University of North Carolina, Wilmington, N.C.
Fossil gastropods preserve evidence of predator-prey interactions useful in studying the ecological and evolutionary consequences of predation. Presentations will address predation on and by fossil gastropods and Recent taxa useful in interpreting the fossil record. ORAL
T53 top Critical Events in the Evolution of Terrestrial Arthropods
Paleontological Society; GSA Geobiology and Geomicrobiology Division
Robert E. Nelson, Colby College, Waterville, Maine; Dena M. Smith, University of Colorado, Boulder, Colo.; S. Bruce Archibald, Harvard University, Cambridge, Mass.
Insects and terrestrial arthropods comprise >90% of all named animal species on Earth. Their fossil record is far less well-known. What are the events that have led to the evolution of terrestrial arthropod clades? ORAL and POSTER
Paleontology/Paleobotany; Sediments, Clastic; Stratigraphy
T54 top The Evolution and Expansion of C4 Plants
Mark Pagani, Yale University, New Haven, Conn.; Darren Grocke, McMaster University, Hamilton, Ontario
The evolutionary history and expansion of C4 plants impact our interpretation of atmospheric CO2 concentrations, temperature, and seasonal aridity. This session explores the history of C4 photosynthesis during the Mesozoic and Cenozoic. ORAL and POSTER
Paleontology/Paleobotany; Paleoclimatology/Paleoceanography; Geochemistry Organic
T55 top Anatomy of an Anachronistic Period: The Early Triassic Environment and Its Effect on the History of Life
Paleontological Society; GSA Sedimentary Geology Division
Adam D. Woods, California State University, Fullerton, Calif.; Frank Corsetti, University of Southern California, Los Angeles, Calif.
The Early Triassic was one of the most unique periods in Earth's history. This session will examine the usual nature of environmental conditions during the period as well as paleobiological trends across the critical interval between the End-Permian extinction and initiation of the biotic recovery in the early Middle Triassic. ORAL
Paleontology/Paleobotany; Sediments, Carbonates; Paleoclimatology/Paleoceanography
T56 top Paleontology and Stratigraphy of the Late Eocene Florissant Formation, Colorado
Paleontological Society; GSA Limnogeology Division; GSA Sedimentary Geology Division
Herbert W. Meyer, Florissant Fossil Beds National Monument, Florissant, Colo.; Dena Smith, University of Colorado, Boulder, Colo.
This session will explore the paleontology, stratigraphic setting, and historical study of the late Eocene plants, insects, and vertebrates from Florissant, including recent work in taxonomy, taphonomy, paleoecology, lithostratigraphy, magnetostratigraphy, conservation, and applications of information technology. ORAL
Paleontology/Paleobotany; Geoscience Information/Communication; History of Geology
T57 top The Concept of Layer-Cake Stratigraphy-Then and Now
GSA History of Geology Division; GSA Sedimentary Geology Division
Charles W. Byers, University of Wisconsin, Madison, Wis.
The concept of layer-cake (time-parallel) stratigraphy was widely accepted during the nineteenth century. It was eclipsed by the facies concept for decades but has made a resurgence in the guise of sequence and event stratigraphy. ORAL
History of Geology; Stratigraphy
T58 top Sedimentary and Stratigraphic Principles and Concepts Applied to the Study of Metamorphic Terranes and Igneous Provinces
North American Commission on Stratigraphic Nomenclature
Lisa Lytle, Colorado School of Mines, Golden, Colo.; Thomas R. Fisher, Colorado School of Mines, Golden, Colo.
This session will focus on integration of modern sedimentologic and stratigraphic concepts with studies of metamorphic and igneous provinces. These methods may improve our understanding of continental accretion, paleoplacers, ore deposits, and layered mafic intrusions. ORAL
Petrology, Metamorphic; Sediments, Clastic; Economic Geology
T59 top Resolving the Late Paleozoic Gondwanan Ice Age in Time and Space: Comparison of Southern and Northern Hemisphere Records
GSA Sedimentary Geology Division
Christopher R. Fielding, University of Nebraska, Lincoln, Nebr.; Tracy D. Frank, University of Nebraska, Lincoln, Nebr.
This session aims to bring together stratigraphers, sedimentologists and geochemists who are working on the climate record of the Carboniferous and Permian systems worldwide. Emphasis will be placed on integrating geochemical with lithostratigraphic archives. ORAL
Stratigraphy; Sediments, Clastic; Sediments, Carbonates
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