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Geologists entered Argentina's Río Iruya canyon to collect a magnetostratigraphic section; results showed that the rocks in the wall were deposited 5-4 Ma. Photo graphics courtesy of James H. Reynolds
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Geologists entered Argentina's Río Iruya canyon to collect a magnetostratigraphic section; results showed that the rocks in the wall were deposited 5-4 Ma. Photo graphics courtesy of James H. Reynolds