Precise U/Pb zircons dates of bentonites in Upper Ordovician and Lower Silurian reference sections in North America and Britain.

Stephanie E Suarez, University of Texas at Austin, Austin, TX, United States, Michael E Brookfield, University of Massachusetts Boston, Boston, MA, United States, Elizabeth J Catlos, Univeristy of Texas at Austin, Earth and Planetary Sciences, Austin, United States, Daniel F Stockli, University of Texas at Austin, Department of Earth and Planetary Sciences, Austin, United States and Richard Alessandro Batchelor, University of St Andrews, St Andrews, United Kingdom
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