Samples and associated geological data are held at the British Geological Survey for Maritime Coastguard Agency (MCA), Civil Hydrography Programme (CHP), Bathymetric Survey HI1334; North Coasts of Yell and Unst, Area in SqKm: 159, (18/02/2017 to 08/08/2017), Standard: IHO S44ed5 Order 1a. Contract: Medium. FY 2017/18. Contractor: MMT UK.