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1CONODONTS 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 original

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 original

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Source URL: wisconsingeologicalsurvey.org

Language: English - Date: 2011-03-28 17:21:06