1. Oklahoma State University; Stillwater Oklahoma USA
2. Now at ConocoPhillips School of Earth and Energy; University of Oklahoma; Norman Oklahoma USA
3. Now at Department of Geological Sciences, College of Earth, Ocean, and Environment; University of Delaware; Newark Delaware USA
4. Department of Geosciences; Virginia Tech; Blacksburg Virginia USA
5. Université Paris Diderot; Paris France
6. School of Earth Atmosphere and Environment; Monash University; Melbourne Victoria Australia
7. Botswana International University of Science and Technology; Palapye Botswana