1. Equinor ASA, Forusbeen 50, 4035 Stavanger, Norway
2. Geospatial Research Ltd, Durham DH1 4EL, UK
3. Department of Earth Sciences, Durham University, Durham DH1 3LE, UK
4. 2 Bucklerburn Drive, Peterculter, Aberdeen AB140XJ, UK
5. Independent (JG Geology), 4 Capella Court, 42 Wood Lane, Falmouth, Cornwall TR114QZ, UK