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Keywords from Image Description:
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 GeomagneticpolaritylateCenozoic svg UTC GeomagneticpolaritylateCenozoic svg United States Geological Survey handtraced to vector by User Intgr derivative work