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Abstract

Marine clays derived from glacial debris in the Bonnefjord, the most easterly portion of the Oslofjord, Norway, are characterized by distinctive microscopic textures that originated at the time of deposition and are similar to the particle-to-particle arrangements reported in studies of “quick clays.” Scanning electron micrographs show that these clays consist chiefly of flocculated domains of face-to-face particles arranged in an edge-to-face, card-house, random pattern. Pelletization by organisms has caused partial collapse of some of the floccules and has produced a rough parallelism of clay domains around silt-size particles. Other bioturbation structures, such as burrows, tubes, and feeding traces, are not associated with any changes in the microtexture of the sediment. The card-house structure is the characteristic textural arrangement of the clays deposited in this quiet, anoxic environment.

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