Samples and associated geological data are held at the British Geological Survey for Maritime Coastguard Agency (MCA), Civil Hydrography Programme (CHP), Bathymetric Survey HI1542; Isle of Grain to Leysdown, Area in SqKm: 48, (02/06/2017 to 25/06/2017), Standard: IHO S44ed5 Order 1a. Contract: SE Coastal Monitoring Programme. FY 2017/18. Contractor: Clinton.