About the Authors

Clint A. Boyd


Affiliation Department of Geology and Geological Engineering, South Dakota School of Mines and Technology, Rapid City, South Dakota, United States of America

Stephanie K. Drumheller

Affiliations Department of Geoscience, The University of Iowa, Iowa City, Iowa, United States of America, Department of Earth and Planetary Sciences, The University of Tennessee, Knoxville, Tennessee, United States of America

Terry A. Gates

Affiliations Department of Biology, North Carolina State University, Raleigh, North Carolina, United States of America, Natural History Museum of Utah, Salt Lake City, Utah, United States of America

Competing Interests

The authors have declared that no competing interests exist.

Author Contributions

Collected stratigraphic and sedimentological data from field loclaity: TAG. Conceived and designed the experiments: CAB SKD. Performed the experiments: CAB SKD. Analyzed the data: CAB SKD TAG. Contributed reagents/materials/analysis tools: CAB SKD. Wrote the paper: CAB SKD TAG.