FIGURE 3. Magnetic stripes on the ocean floor.

From the following article:

Earth science: Geomagnetic reversals

David Gubbins

Nature 452, 165-167(13 March 2008)

doi:10.1038/452165a

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The identification of these stripes meant that the corresponding rocks on the ocean floor could be dated rather precisely against the reversal timescale (see Fig. 4). The youngest floor (red) is close to the mid-ocean ridges where oceanic crust is formed, and the oldest (blue) is at the Atlantic coast and in the southwest Pacific. (Courtesy of R. D. Müller. See R. D. Müller et al. Geochem. Geophys. Geosyst. doi:10.1029/2007GC001743; 2008.)

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