About the Authors

Stijn De Schepper

smad2@cantab.net

Affiliations Department of Earth Science, University of Bergen, Bergen, Norway, Geosciences Department, University of Bremen, Bremen, Germany

Jeroen Groeneveld

Affiliation MARUM – Center for Marine Environmental Sciences, University of Bremen, Bremen, Germany

B. David A Naafs

Current address: Organic Geochemistry Unit, School of Chemistry, University of Bristol, Bristol, United Kingdom

Affiliation Alfred Wegener Institute for Polar and Marine Research, Bremerhaven, Germany

Cédéric Van Renterghem

Affiliation Research Unit Palaeontology, Ghent University, Ghent, Belgium

Jan Hennissen

Affiliation Department of Earth Sciences, University of Toronto, Toronto, Ontario, Canada

Martin J. Head

Affiliations Department of Earth Sciences, University of Toronto, Toronto, Ontario, Canada, Department of Earth Sciences, Brock University, St. Catharines, Ontario, Canada

Stephen Louwye

Affiliation Research Unit Palaeontology, Ghent University, Ghent, Belgium

Karl Fabian

Affiliation Norwegian Geological Survey, Trondheim, Norway

Competing Interests

The authors have declared that no competing interests exist.

Author Contributions

Conceived and designed the experiments: SDS JG BDAN. Performed the experiments: SDS JG BDAN CVR JH KF. Analyzed the data: SDS JG BDAN CVR JH MJH SL KF. Contributed reagents/materials/analysis tools: SDS JG BDAN MJH SL KF. Wrote the paper: SDS JG BDAN CVR JH MJH SL KF.