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Layer of monogenic chert breccia confined bewteen two unbrecciated chert layers of c. 2.8Ga deposition age. Photo ID 672

Layer of monogenic chert breccia confined bewteen two unbrecciated chert layers of c. 2.8Ga deposition age. Photo ID 672

Photograph: I.Zibra

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