Before revision: The precipitation of calcium carbonate from marl lakes is a consequence of removal of carbon dioxide by photosynthesis (particularly by Chara, stonewort, which becomes encrusted with calcium carbonate ) or outgassing, or as a result of the common-ion effect.
After revision: The precipitation of low-magnesium calcite during the summer from marl lakes is a consequence of removal of carbon dioxide by photosynthesis (particularly by Chara, stonewort, which becomes encrusted with calcium carbonate ) or outgassing, or as a result of the common-ion effect.