1. School of Earth and Ocean Sciences; Cardiff University, Main Building, Park Place; Cardiff; UK
2. Organic Geochemistry Unit, The Cabot Institute and Bristol Biogeochemistry Research Centre, School of Chemistry; University of Bristol; Bristol; UK
3. Geology Department; Amgueddfa Cymru-National Museum Wales; Cardiff; UK
4. Department of Geology, University of Leicester, Leicester, UK and NERC Isotope Geosciences Laboratory; British Geological Survey; Nottingham; UK
5. Stratigraphy / Paleontology, Department of Earth Sciences; Utrecht University; Utrecht; The Netherlands