1. Department of Geology & Centre for Integrated Geological Studies, Babes-Bolyai University, 400084 Cluj-Napoca, Romania
2. Department of Earth Sciences, Durham University, Durham DH1 3LE, UK
3. Geospatial Research Ltd., Durham DH1 4EL, UK
4. Department of Geology, Hull University, Hull HU6 7RX, UK
5. School of Geosciences, University of Aberdeen, Aberdeen AB24 3FX, UK
6. British Geological Survey, Edinburgh RH14 4BA, UK