Submarine structures made by leaking gases (Priority Marine Feature) (SNH WMS)
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The Priority Marine Feature (PMF) list contains 81 habitats and species considered to be of conservation importance in Scotland's seas. It includes many features which are characteristic of the Scottish marine environment, ranging from flame shell beds in coastal waters, to cold-water coral reefs of the deeper seas, and mobile species such as minke whale and basking shark.
This layer shows the distribution of submarine structures made by leaking gases. These are rocks, pavements and pillars up to four metres high and composed of carbonate cement. This cement is produced by microbial oxidation of gases (mostly methane) that bubble up from below the seafloor.