Chris Lowery, University of Texas at Austin, Austin, TX, United States, Jean M. Self-Trail, USGS, Reston, VA, United States, Craig Barrie, GeoMark Research, Ltd., Organic Geochemistry Laboratory, Houston, TX, United States, Kate Gilbreath, University of Texas, Department of Geological Sciences, Austin, TX, United States and Lara Yagodzinski, University of Pittsburgh, Pittsburgh, United States