1. Department of Geology, University of Kansas, Lawrence, Kansas, USA.
2. Department of Chemistry, University of Kansas, Lawrence, Kansas, USA.
3. School of Chemistry, The University of Sydney, Sydney, Australia.
4. Advanced Photon Source, Argonne National Laboratory, Argonne, Illinois, USA.
5. Geological Technical Services Division, Saudi Aramco, Dhahran, Saudi Arabia.
6. Palaeobotany-Palaeopalynology-Micropalaeontology, University of Liège, Liège, Belgium.