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The occurrence of patchy preservation of ripples and of palimpsest ripples on many sandstone bed surfaces of the c. 2.1 Ga Magaliesberg Formation (Pretoria Group, Transvaal Supergroup), South Africa, suggests that microbial mats grew within the upper parts of sandy deposits of the braid-deltaic—tidally controlled epeiric marine coastline palaeoenvironment inferred for this stratigraphic unit. Recently,...
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