Appendix 1: Operational information about the piston and vibra cores such as date acquired, core name, total length, water depth, and geographic location associated with the 2009 MITAS Expedition. Appendix 2: Visual core descriptions (VCD) were recorded manually for each core section. These observations have been integrated with sampling information, smear slide, coarse fraction, grain size measurements, and core images using WellCAD digital visual core description software. Appendix 3: positions of samples selected for analyses from the core during processing were recorded in a sample spreadsheet Appendix 4: MITAS-09 XRD plots Table 1: MITAS Smear Slide data Table 2: MITAS Coarse fraction data Table 3: MITAS XRD analyses Table 4: MITAS grain size data, volume weighted mean Table 5: MITAS grain size data, sand, silt, clay fractions In 2009, an international, multi-disciplinary science party aboard the U.S. Coast Guard icebreaker Polar Sea successfully completed a trans-U.S. Beaufort Shelf expedition aimed at understanding the sources and volumes of methane across this region. Following more than a year of preliminary cruise planning and a thorough site evaluation, the Methane in the Arctic Shelf/Slope (MITAS) expedition departed from the waters off the coast of Barrow, Alaska in September 2009. The expedition, led by researchers with the U.S. Naval Research Laboratory (NRL), the Royal Netherlands Institute for Sea Research (NIOZ), and the U.S. Department of Energys National Energy Technology Laboratory (NETL), was organized with an international shipboard science team consisting of 33 scientists with the breadth of expertise necessary to meet the expedition goals. NETL researchers led the expeditions initial core processing and lithostratigraphic evaluations, which are the focus of this report. A full expedition summary is available in First Trans-Shelf-Slope Climate Study in the U.S. Beaufort Sea Completed by Coffin et al. (2010).