Geomagnetic_late_cenozoic.png
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Late Cenozoic geomagnetic time scale. Dark (light) areas denote periods of normal (reversed) polarity.
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This image is in the
public domain
in the United States because it only contains materials that originally came from the
United States Geological Survey
, an agency of the
United States Department of the Interior
. For more information, see
the official USGS copyright policy
.
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Source: U.S. Geological Survey
Open-File Report 03-187 http://geopubs.wr.usgs.gov/open-file/of03-187/