Samples and associated geological data are held at the British Geological Survey for Maritime Coastguard Agency (MCA), Civil Hydrography Programme (CHP), Bathymetric Survey HI1121, Needles Channel. Area in SqKm: Unknown, (26/08/2005 to 10/09/2005), Standard: ISO S44ed4 Order 1. FY 2005/06. Contractor: Royal Navy.