David Auerbach Colwyn, University of Colorado at Boulder, Geological Sciences, Boulder, CT, United States, Kathryn E Snell, University of Colorado Boulder, Department of Geological Sciences, Boulder, CO, United States, Jeff Benowitz, University of Alaska Fairbanks, Geophysical Institute, Fairbanks, AK, United States, Trevor John Porter, University of Toronto Mississauga, Department of Geography, Mississauga, ON, Canada and Julio Sepulveda, University of Colorado, Organic Geochemistry Laboratory, INSTAAR and Department of Geological Sciences, Boulder, CO, United States