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Location within the Lost City Hydrothermal Field of carbonate chimney samples from which sequences were collected. Sample 1 was obtained from the pinnacle of the main edifice known as Poseidon, 50 m above the flange from which samples 2 and 3 were collected. Sample 4 is from a small, isolated chimney with no apparent venting activity found near the bottom of a cliff face. Scale bars in all photographs are 10 cm.
