1. Organic Geochemistry Laboratory, Department of Geological Sciences and Institute of Arctic and Alpine Research (INSTAAR)University of Colorado Boulder Boulder CO USA
2. Departamento de Ciencias de la Tierra and Instituto Universitario de Ciencias Ambientales de AragónUniversidad de Zaragoza Zaragoza Spain
3. Department of Geology and GeophysicsYale University New Haven CT USA
4. Department of Earth and Environmental SciencesWesleyan University Middletown CT USA
5. Department of Earth SciencesUniversity of California Riverside CA USA
6. State Key Laboratory of Palaeobiology and Stratigraphy, Nanjing Institute of Geology and PalaeontologyChinese Academy of Sciences Nanjing China
7. Department of Earth, Atmospheric, and Planetary SciencesMassachusetts Institute of Technology Cambridge MA USA