REVISITING A TREMADOCIAN (EARLY ORDOVICIAN) MASS EXTINCTION EVENT AND OCEAN ANOXIA: NEW INSIGHTS FROM TRACE METAL ABUNDANCES AND URANIUM ISOTOPE COMPOSITIONS OF CARBONATES FROM THE GREAT BASIN REGION, WESTERN USA
LU, Xinze, Department of Earth and Environmental Sciences, University of Waterloo, Waterloo, ON N2L 3G1, Canada, EDWARDS, Cole, Department of Geological and Environmental Sciences, Appalachian State University, 572 Rivers St., Boone, NC 28608 and KENDALL, Brian, Department of Earth and Environmental Sciences, University of Waterloo, 200 University Avenue W, Waterloo, ON N2L 3G1, Canada