1. Department of Geosciences, Universiti Teknologi PETRONAS, 32610 Seri Iskandar, Perak Darul Ridzuan, Malaysia
2. School of Geography, Geology and the Environment, University of Leicester, Leicester LE1 7RH, UK (e-mail: mri@le.ac.uk)
3. Faculty of Advanced Science and Technology, Kumamoto University, 2-39-1, Kurokami, Chuo-ku, Kumamoto 860-8555, Japan
4. Department of Earth Sciences, The Natural History Museum, Cromwell Road, London SW7 5BD, UK
5. Department of Geology, Vietnam National Museum of Nature, Vietnam Academy of Science and Technology, 18 Hoang Quoc Viet, Cau Giay, Hanoi, Vietnam
6. Department of Geology, Ghent University, Krijgslaan 281/S8, 9000 Ghent, Belgium