Samples and associated geological data are held at the British Geological Survey for Maritime Coastguard Agency (MCA), Civil Hydrography Programme (CHP), Bathymetric Survey HI1254; Sound of Harris, Area in SqKm: 44, (28/01/2008 to 15/03/2008), Standard: IHO S44ed4 Order 1. Contract: RRS (2006 LT). FY 2007/08. Contractor: MMT.