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Light micrographs of “free-floating” clots. (a) Clots (arrows) characterized by irregular shapes and spiky protuberances that apparently developed in situ in strongly hydrothermally influenced sediments (same facies as in Fig. 7a). Faint wisps of carbon outline the very fine-grained sediment beds. (b) Clot (arrow) with an irregular but slightly more rounded shape, developed in primary hydrothermal silica. (Color graphics available at www.liebertonline.com/ast)
