Samples and associated geological data are held at the British Geological Survey for Maritime Coastguard Agency (MCA), Civil Hydrography Programme (CHP), Bathymetric Survey HI1242; Portland Bill to Petit Tor Point, Area in SqKm: 118, (06/05/2008 to 23/05/2009), Standard: IHO S44ed5 Order 1a. Contract: SW Coastal Monitoring Programme. FY 2007/08. Contractor: Halcrow.