14 - 17:33 GeomagneticTimeScale

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17:33 Geomagnetic Time Scale Based on determining the magnetization of rocks of known age (from both the  oceans and the continents) We have a good record of geomagnetic reversals back to about 60 Ma no pattern of how it flips Harry Hess In the navy Professor at Princeton Father of sea floor spreading Helped people accept plate tectonics Seafloor spreading  occurs at mid-ocean ridges where new oceanic crust is  formed through volcanic activity and then gradually moves away from the ridge.  Seafloor spreading helps explain continental drift in the theory of plate tectonics. Caused by convection currents Magnetic Stripes on the Sea Floor
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14 - 17:33 GeomagneticTimeScale

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