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Thick, widespread spiculitic chert and subordinate carbonate of the upper Permian (late Guadalupian to Lopingian) Degerbols and Lindstrom formation record deposition during a third-order, late Palaeozoic sea level cycle. The succession is interpreted to have accumulated as a ramp in a mid-latitude, relative low-energy setting that was periodically perturbed by storms, one of the few such occurrences...
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