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Two generations of superposed folds in c. 2.8Ga banded iron formation, creating a dome-and-basin pattern Photo ID 671

Two generations of superposed folds in c. 2.8Ga banded iron formation, creating a dome-and-basin pattern Photo ID 671

Photograph: I. Zibra

Reference: Geological Survey of Western Australia. http://www.dmp.wa.gov.au/371.aspx