About the Authors
Department of Paleontology, Burke Museum of Natural History, Seattle, Washington, United States of America
Microtechnics Inc., Granite Bay, California, United States of America
Department of Geology, Jagiellonian University, Krakow, Poland
The authors have declared that no competing interests exist.
Conceived and designed the experiments: TGK GG ZS. Performed the experiments: TGK GG ZS. Analyzed the data: TGK GG ZS. Contributed reagents/materials/analysis tools: TGK GG ZS. Wrote the paper: TGK.