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A 5-foot-wide flange, or ledge, on the side of a chimney in the Lost City Field.

photo of carbonate growth on flange


A 5-foot-wide flange, or ledge, on the side of a chimney in the Lost City Field is topped with dendritic carbonate growths that form when mineral-rich vent fluids seep through the flange and come into contact with the cold seawater.

Credit: University of Washington/Woods Hole Oceanographic Institution

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Related story: Scientists Discover Secrets of 'Lost City'