vol. 43 no. 2 159-162
- Received 29 August 2014.
- Revision received 26 November 2014.
- Accepted 2 December 2014.
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- 1Department of Earth Science and Engineering, South Kensington Campus, Imperial College, London SW7 2AZ, UK
- 2School of Geology and Geophysics, 100 East Boyd Street, The University of Oklahoma, Norman, Oklahoma 73019, USA
- 3Department of Integrative Biology and Museum of Paleontology, University of California–Berkeley, 3060 Valley Life Science Building, Berkeley, California 94720-3140, USA
- 4Laboratory of Palaeobotany and Palynology, Department of Earth Sciences, Utrecht University, Budapestlaan 4, 3584CD Utrecht, Netherlands
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