About the Authors

Patricia G. Weaver

trish.weaver@ncdenr.gov

Affiliation Research and Collections, North Carolina Museum of Natural Sciences, Raleigh, North Carolina, United States of America

Larisa A. Doguzhaeva

Affiliation Department of Palaeozoology, Swedish Museum of Natural History, Stockholm, Sweden

Daniel R. Lawver

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

R. Christopher Tacker

Affiliation Research and Collections, North Carolina Museum of Natural Sciences, Raleigh, North Carolina, United States of America

Charles N. Ciampaglio

Affiliation Earth and Environmental Sciences, Wright State University, Celina, Ohio, United States of America

Jon M. Crate

Affiliation Analytical Chemistry, FAI Materials Testing Lab Incorporated, Marietta, Georgia, United States of America

Wenxia Zheng

Affiliation Department of Marine, Earth and Atmospheric Sciences, North Carolina State University, Raleigh, North Carolina, United States of America

Competing Interests

The authors have the following competing interest: JC is an employee of FAI Materials Testing Laboratory. There are no patents, products in development or marketed products to declare. This does not alter the authors' adherence to all the PLoS ONE policies on sharing data and materials.

Author Contributions

Conceived and designed the experiments: PW LD DL RT CC JC WZ. Performed the experiments: PW LD DL RT JC WZ. Analyzed the data: PW LD DL RT CC JC WZ. Contributed reagents/materials/analysis tools: PW LD DL RT CC JC WZ. Wrote the paper: PW LD DL RT CC JC WZ.