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1 Department of Geological Sciences, California State University, Long Beach, California 90840, USA
2 Department of Geology and Geophysics, University of California, Berkeley, California 94720, USA
3 Department of Geological Sciences, California State University, Fullerton, California 92834, USA
4 Department of Geology, University of Puerto Rico, Mayagüez, Puerto Rico 00681
5 Department of Geological Sciences, Ohio State University, Columbus, Ohio 43210, USA
6 Centre Géoscientifique de Québec, Ste-Foy, Québec, G1V 4C7 Canada
7 Department of Geological Sciences, University of Nevada, Reno, Nevada 89557, USA
Integrated sequence stratigraphic, biostratigraphic, and chemostratigraphic analyses of three stratigraphic sections in central Nevada indicate that Late Ordovician glaciation-induced sea-level fall produced diachronous, stepwise faunal turnover in graptolites, conodonts, chitinozoans, and radiolarians, and also triggered a strong, but transient, positive 
13C excursion. This pattern is very different from that described for most mass extinction events.
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