About the Authors

Robert W. Boessenecker

boessenecker@gmail.com

Current address: Department of Geology, University of Otago, Dunedin, New Zealand

Affiliations Department of Earth Sciences, Montana State University, Bozeman, Montana, United States of America, University of California Museum of Paleontology, University of California, Berkeley, California, United States of America

Frank A. Perry

Affiliation Santa Cruz Museum of Natural History, Santa Cruz, California, United States of America

James G. Schmitt

Affiliation Department of Earth Sciences, Montana State University, Bozeman, Montana, United States of America

Competing Interests

The authors have declared that no competing interests exist.

Author Contributions

Conceived and designed the experiments: RWB. Performed the experiments: RWB. Analyzed the data: RWB. Contributed reagents/materials/analysis tools: RWB FAP JGS. Wrote the paper: RWB FAP JGS.