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[Pope and Steffen (2003)][1] described an interesting new model suggesting relations between the Gondwana glaciation and late Middle (Chatfieldian) through Late Ordovician (Cincinnatian) upwelling of cold water and chert formation. They used the distribution of Middle and Late Ordovician chert-

Widespread, prolonged late Middle to Late Ordovician upwelling in North America: A proxy record of glaciation?: Comment and Reply