2008 Joint Meeting of The Geological Society of America, Soil Science Society of America, American Society of Agronomy, Crop Science Society of America, Gulf Coast Association of Geological Societies with the Gulf Coast Section of SEPM

Paper No. 5
Presentation Time: 9:15 AM

The Anticosti Project: Biosphere Collapse and Recovery during a Global Glacial Epoch

AUSICH, William I., School of Earth Sciences, The Ohio State University, 155 South Oval Mall, Columbus, OH 43210, TAPANILA, Leif, Department of Geosciences, Idaho State University, Campus Box 8072, Pocatello, ID 83209-8072, JIN, Jisuo, Department of Earth Sciences, University of Western Ontario, London, ON N6A 5B7, Canada and COPPER, Paul, Earth Sciences, Laurentian Univ, Ramsey Lake Road, Sudbury, ON P3E 2C6, ausich.1@osu.edu

The Late Ordovician witnessed the second-most devastating collapse of the biosphere, including the extinction of an estimated 57% of marine genera, and triggering significant reorganization among the major clades of the Paleozoic Evolutionary Fauna. This ancient event provides relevant context to the modern biotic crisis because of its similar global climate regime involving major continental glaciers centered on the South Pole. The nearly continuous, 1.1 km thick stratigraphic section on Anticosti Island (Quebec) records the Rawtheyan–Telychian time interval and provides a unique opportunity to understand the extinction and origination dynamics of shallow-water subtropical organisms through the Ordovician biotic crisis because the fauna, phylogeny, sedimentary facies, biogeography, and paleocommunities can be very well constrained. The collection and systematic paleontology of the Anticosti fauna has reached a high level of maturity in most clades, and the vast majority of all known specimens and all modern studies can be keyed into a single locality system containing more than 1,500 localities with precise geographic and stratigraphic data. These data will be pooled into a single compendium that can examine the distribution of single taxa or communities temporally, on onshore-offshore gradients, and most importantly through the end-Ordovician biosphere collapse and early recovery through the Telychian.