Figure F3. Thin section and SEM images of mottled lithified horizons. A. Sketch of mottled lithified horizon. Pink = coral skeletons, black circles = framboidal pyrites, red = brachiopods, green = echinoids, blue = cement. B. Low-magnification thin section image showing lighter colored coral skeletons with darker colored fringes. C, D. Enlarged images showing darker colored fringes containing framboidal pyrites. E. Framboidal pyrites.
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