These data layer are supplied by the UK Onshore Geophysical Library which manages the 2D & 3D seismic surveys acquired by the Exploration Industry on behalf of the Oil & Gas Authority. The Coal Authority seismic data is managed and held by the British Geological Survey. All original navigation locations as held by UKOGL are referenced to the British National Grid. Whilst all reasonable efforts have been made to validate the data supplied, UKOGL does not warrant the accuracy of the information presented. This data is also subject to ongoing revision and addition. This data is supplied for internal use only and written permission must be sought from UKOGL and approval granted for use of this data with any public facing service or web site. UKOGL: contact@ukogl.org.uk