of serpentine mud, with meter-deep fissures arranged in a crosscutting orientation. Ecology South Chamorro Seamount is host to a variety of fauna, including mussels, gastropods, tube worms, and galatheid crabs. A borehole observatory on the summit produced 20,000 litres of microbially-altered fluid per day for study. These organisms are supported by low-temperature springs from the fissures surrounding the summit zone. The mussels are probably of the genus Bathymodiolus, which require a high concentration of methane in their food source. The fluid composition and the biological community suggests that the summit region is an active cold seep region. See also Graveyard Seamounts Jasper Seamount Mud volcano Muirfield Seamount Sedlo Seamount References Seamounts of the Pacific Ocean Mud volcanoes Philippine Sea