Trempealeauan
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1![]() | CONODONTS AND THE CAMBRIAN–ORDOVICIAN BOUNDARY IN WISCONSIN Brian P. Parsons1 and David L. Clark1 ABSTRACT For more than 100 years, the Cambrian–Ordovician boundary in the Upper Mississippi Valley, the originalAdd to Reading ListSource URL: wisconsingeologicalsurvey.orgLanguage: English - Date: 2011-03-28 17:21:06 |