Keywords: Geomagnetic polarity late Cenozoic PT.svg Geomagnetic polarity during the late Cenozoic Era Dark areas denote periods of normal polarity light areas denote reverse polarity Geomagnetic_polarity_late_Cenozoic svg 2011-01-23 20 12 UTC Geomagnetic_polarity_late_Cenozoic svg United States Geological Survey hand-traced to vector by User Intgr derivative work João Sousa <span class signature-talk >talk</span> In portuguese João Sousa Geomagnetic_polarity_late_Cenozoic svg U S Geological Survey http //geopubs w</nowiki> Uploaded with derivativeFX Cenozoic Geology timelines SVG geology Geomagnetism |