Samples and associated geological data are held at the British Geological Survey for Maritime Coastguard Agency (MCA), Civil Hydrography Programme (CHP), Bathymetric Survey HI1501; Porthcawl to Barry, Area in SqKm: 234, (29/08/2017 to 22/03/2018), Standard: IHO S44ed5 Order 1a. Contract: Shallow. FY 2017/18. Contractor: Gardline.