INFOMAR Seabed Samples Particle Size Analysis represent locations where samples have been taken and particle size analysis (PSA) carried out on samples. PSA is applied to determine the range of sediment sizes contained in the sample. These size classes can then be grouped into mud, sand and gravel on the basis of their diameter with the boundary between mud and sand size grains at 63µm (0.063mm) and the boundary between sand and gravel size grains at 2mm. The relative proportion of the grains in the three categories is then used to classify the sediment present in the sample. The Folk Classification scheme has 15 classes to describe the sediment. Gradistat software was used to classify the PSA output for each sediment sample into a Folk sediment class and to provide information on the sorting and metrics for the mode and D50.