While taking oceanographic observations in Chedabucto Bay, Nova Scotia, following the grounding of the tanker ARROW on February 4, I 970, small (5 µ to 1 or 2 mm) oil particles were found in the water column. The particles were collected with plankton nets and water bottles. This paper discusses the origin of the particles, their distribution in size and in depth, and the transport of particles out of Chedabucto Bay into the open ocean....