About the Authors

Alexander P. Wolfe

awolfe@ualberta.ca

Affiliation Department of Earth and Atmospheric Sciences, University of Alberta, Edmonton, Canada

Adam Z. Csank

Affiliation Environment and Natural Resources Institute, University of Alaska, Anchorage, Alaska, United States of America

Alberto V. Reyes

Affiliation Department of Geoscience, University of Wisconsin, Madison, Wisconsin, United States of America

Ryan C. McKellar

Affiliation Department of Earth and Atmospheric Sciences, University of Alberta, Edmonton, Canada

Ralf Tappert

Affiliation Institute of Mineralogy and Petrography, University of Innsbruck, Innsbruck, Austria

Karlis Muehlenbachs

Affiliation Department of Earth and Atmospheric Sciences, University of Alberta, Edmonton, Canada

Competing Interests

The authors have declared that no competing interests exist.

Author Contributions

Conceived and designed the experiments: APW AZC AVR RCM RT KM. Performed the experiments: APW AZC AVR RCM RT KM. Analyzed the data: APW AZC AVR RCM RT KM. Contributed reagents/materials/analysis tools: APW AZC AVR RCM RT KM. Wrote the paper: APW AZC AVR RCM RT KM. Microscopy: APW. Wood anatomy: ACZ. Cellulose purification: ACZ AVR. FTIR spectroscopy: RCM RT. Isotopic measurements: ACZ AVR RCM RT KM.