Laboratory study of dolomitic mottling in the lower Platteville limestone of the Minneapolis-St. Paul, Minnesota region shows dolomite distributed through the rock in an anastamosing, irregularly pipe-like manner. Alteration of primary structures and lack of control by jointing indicate that dolomitization occurred after lithification but before jointing. Dolomitization is regarded as effected by introduced magnesian solutions migrating laterally and vertically through permeable zones in the limestone.

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