Multiple thick stumps with heavy ferromanganese coating were seen throughout the dive, which are presumably the remnants of very old coral colonies.
Stumps
Image courtesy of the NOAA Office of Ocean Exploration and Research, Exploring Deep-sea Habitats off Puerto Rico and the U.S. Virgin Islands. Download larger version (jpg, 1.2 MB).
Multiple thick stumps with heavy ferromanganese coating were seen throughout the dive, which are presumably the remnants of very old coral colonies.
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