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Ice sheet meltback in the aftermath of the Sturtian (mid Cryogenian) glaciation was accompanied or followed by deposition of thick carbonate successions. In northern Namibia, the Rasthof Formation is a 200–400m thick cap carbonate sequence divided into (1) a basal cap dolostone, (2) a microbial member and (3) an epiclastic member. This subdivision applies for >100km along strike at the southern...