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(Left) Author’s photo of overhead view of ca. 2.7 Ga domical stromatolites from the Tumbiana Formation, Fortescue Group. (Right top) Cross-section of a Tumbiana stromatolite (credit: Martin Van Kranendonk). (Right bottom) Author’s photo of cross-sectional view of centimeter-scale, domical stromatolites in black chert from the “Trendall locality” outcrop of the ca. 3.4 Ga Strelley Pool Formation on the Shaw River.
