Samples and associated geological data are held at the British Geological Survey for Maritime Coastguard Agency (MCA), Civil Hydrography Programme (CHP), Bathymetric Survey HI1483; Thames Estuary Routine Resurvey 2015, TE5A Long Sand Head Full Area, Area in SqKm: 33; TE3A Sunk Focused Area, Area in SqKm: 9, (15/08/2015 to 03/10/2015), Standard: IHO S44ed5 Order 1a. Contract: RRS. FY 2015/16. Contractor: EGS.