1. Coal Geology and Organic Petrology Laboratory, Department of Applied Geology, Indian Institute of Technology (Indian School of Mines), Dhanbad 826004, Jharkhand, India
2. Department of Geology, Mizoram University, Aizawl 796004, Mizoram, India
3. Centre for Petroleum Exploration, Mizoram University, Aizawl 796004, Mizoram, India