About the Authors
- Johan Lindgren
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* E-mail: johan.lindgren@geol.lu.se
Affiliation Department of Earth and Ecosystem Sciences, Lund University, Lund, Sweden
- Michael J. Everhart
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Affiliation Sternberg Museum of Natural History, Fort Hays State University, Hays, Kansas, United States of America
- Michael W. Caldwell
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Affiliation Department of Earth and Atmospheric Sciences, and Department of Biological Sciences, University of Alberta, Edmonton, Alberta, Canada
Competing Interests
The authors have declared that no competing interests exist.
Author Contributions
Analyzed the data: JL MJE MWC. Wrote the paper: JL.