A principal objective of Leg 178 was to compile a high-resolution history of grounded ice-volume fluctuations on the Pacific margin of the Antarctic Peninsula. The continental shelf contains the most direct information, but this record is incomplete and difficult to sample. A more complete but indirect record of Antarctic Peninsula glaciation is preserved in the hemipelagic sediment drifts on the continental rise. This study focuses on the shape, roundness, lithology, and surface texture of pebbles that were eroded and modified by glaciers on the Antarctic Peninsula and then transported offshore by icebergs. Originally, this study was designed to complement the calculation of the ice-rafted debris mass accumulation rate (IRD MAR) from Site 1101 (Cowan, Chap. 10, this volume) and included 81 pebbles >10 mm in diameter that were deposited since 3.1 Ma. Pebbles from Site 1101 were collected from the working half of the core during shipboard sampling. After preliminary analysis, pebbles from Sites 1095 and 1096, also on the continental rise, were obtained from the core repository to increase the sample size. The three sites are 500 km apart, parallel to the shelf, and range from 94 to 213 km from the continental shelf edge (Fig. F1). These proximal sites appear to share a similar distribution of IRD from Antarctic Peninsula glaciers since 3.1 Ma. The lithologies of 480 pebbles were identified in hand specimen and fine-grained lithologies were confirmed in thin section. Shape and roundness of 393 (undamaged) pebbles were measured. Of the 480 pebbles, 331 are from portions of the core that are younger than 3.1 Ma; of those, 318 were measured for shape and roundness.