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Ancient cold-seep carbonate section

Thin section of ancient cold-seep carbonate viewed with a light microscope. The paler areas are filled with calcium carbonate in the aragonite crystal form, the darker areas are hydrocarbon residues.
Thin section of ancient cold-seep carbonate viewed with a light microscope. The paler areas are filled with calcium carbonate in the aragonite crystal form, the darker areas are hydrocarbon residues.