Samples and associated geological data are held at the British Geological Survey for Maritime Coastguard Agency (MCA), Civil Hydrography Programme (CHP), Bathymetric Survey HI1122; Sanday Sound to Westray Firth (Orkney Islands), Area in SqKm: 308, (28/02/2005 to 22/05/2005), Standard: IHO S44ed4 Order 1. Contract: Orkney Islands. FY 2004/05. Contractor: MMT.