"The mid-Proterozoic Griquatown banded ironstones of South Africa are regarded as corresponding to a syn-orogenic 'flysch' phase of deposition, their accumulation being restricted, however, to parts of a sedimentary basin far removed from the site of uplift. Their banding is related to recurrent isostatic readjustments and their development is thought to reflect a local semi-rigid condition of the Precambrian crust."

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