Description: This shapefile shows the results of partical size analysis (PSA) carried out on samples from 2004. PSA is applied to determine the range of sediment sizes contained in the sample which can often reveal an insight about the processes operating in the depositional environment. The results show percentage gravels, sands, silt and mud present in the sample. This analysis is also used to determine if the sample is well or poorly sorted. These samples are located in the Rockall Bank, and off the coasts of Dublin, Kerry, Clare and Donegal.