The gravel component in marine sediments on the continental margin of Antarctica is almost entirely from transport by grounded ice, ice shelves, ice tongues, and icebergs. Surface characteristics, like faceting, striations, and other specific glacigenic shapes, were recorded as well as lithology. Few systematic differences in clast shape in modern sediments could be detected among the various glaciological environments; variation in shape within a given environment is greater than that between different environments. Abrasion of clasts at the interface between glacier and bedrock, before transport into the ocean, is less important than in temperate regions. Debris seems to be the product of rock fracturing at a relatively dry, frozen ice bed. More than half, and sometimes nearly all, the clasts are faceted. -from Authors