About the Authors

Roger B. J. Benson


Affiliations Department of Earth Sciences, University of Cambridge, Cambridge, United Kingdom, Department of Earth Sciences, University College London, London, United Kingdom

Mark Evans

Affiliations New Walk Museum and Art Gallery, Leicester, United Kingdom, Department of Geology, University of Leicester, Leicester, United Kingdom

Patrick S. Druckenmiller

Affiliation University of Alaska Museum and Department of Geology and Geophysics, University of Alaska Fairbanks, Fairbanks, Alaska, United States of America

Competing Interests

The authors have declared that no competing interests exist.

Author Contributions

Analyzed the data: RBJB ME PSD. Wrote the paper: RBJB ME PSD.