Maximum glaciation of the northern hemisphere (black) during the Quaternary climatic cycles

• Ice coverage: J. Ehlers & P.L. Gibbard: The extent and chronology of Cenozoic global glaciation. Quaternary International, 164-165, 6-20, 2007 doi:10.1016/j.quaint.2006.10.008
• Topography: U.S. Department of Commerce, National Oceanic and Atmospheric Administration, National Geophysical Data Center (NOAA/NGDC), 2-minute Gridded Global Relief Data (ETOPO2) 2006
• Map software: Schlitzer, R., Ocean Data View, http://odv.awi.de, 2007