Samples and associated geological data are held at the British Geological Survey for Maritime Coastguard Agency (MCA), Civil Hydrography Programme (CHP), Bathymetric Survey HI1324; Sound of Barra, Area in SqKm: 172, (05/05/2012 to 31/08/2012), Standard: IHO S44ed5 Order 1a. Contract: Shallow. FY 2011/12. Contractor: EMU.