In the history of Devonian potash rocks of Saskatchewan, primary carnallite and sylvinite, precipitated at several stratigraphic levels, were later altered into secondary sylvinite through infiltration of brines. Residual solutions saturated with magnesium, potassium and sodium chlorides penetrated these levels where secondary carnallite, sylvite and halite were eventually precipitated. Considerably lower bromide content of the halite in the sylvinites of the Prairie Evaporite Formation cannot be explained on the basis of primary precipitation.

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