Keywords: Geomagnetic polarity late Cenozoic.svg Geomagnetic polarity during the late Cenozoic Era Dark areas denote periods of normal polarity light areas denote reverse polarity U S Geological Survey http //geopubs wr usgs gov/open-file/of03-187/ Open-File Report 03-187 2007-10-08 United States Geological Survey hand-traced to vector by me User Intgr Geomagnetic polarity late Cenozoic PT svg Image Geomagnetic late cenozoic png Image Geomagnetic late cenozoic-220x768px png Inkscape translation possible SVG geology Geology timelines Cenozoic Geomagnetism |