Samples and associated geological data are held at the British Geological Survey for Maritime Coastguard Agency (MCA), Civil Hydrography Programme (CHP), Bathymetric Survey HI1364; Sound of Mull, Area in SqKm: 149, (28/09/2011 to 13/01/2012), Standard: IHO S44ed5 Order 1a. Contract: Medium (2011). FY 2011/12. Contractor: NetSurvey.