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The Buck Reef is a 250–400 m thick sequence of banded black and white (BW and the micro-layering within the black layers formed by annual temperature fluctuations, favouring microbial activity in summer and inorganic silica precipitation in winter. Outcrop-scale alternation of B&W layers was associated with major, thousand-year-long climate events: white cherts represent massive silica precipitation resulting from changes in ocean circulation and temperature during cold intervals.

The Sedimentary Origin of Black and White Banded Cherts of the Buck Reef, Barberton, South Africa