1. Department of Palaeozoology, Swedish Museum of Natural History, 10405 Stockholm, Sweden.
2. Department of Geological Sciences, Stockholm University, 10691 Stockholm, Sweden.
3. Department of Earth Sciences, University of Bristol, Bristol BS8 1RJ, UK.
4. Institute of Geology, Chinese Academy of Geological Sciences, Beijing 100037, China.
5. Swiss Light Source, Paul Scherrer Institute, CH-5232 Villigen, Switzerland.
6. Institute for Biomedical Engineering, University and Eidgenössische Technische Hochschule Zürich, CH-8092 Zürich, Switzerland.
7. Nordic Center for Earth Evolution, Swedish Museum of Natural History, 10405 Stockholm, Sweden.