Seafloor dating

The ocean plates spread and grow in opposite directions, so rocks that are equidistance from the center have the same magnetic polarity and age.

That is, until they get subducted and recycled under less-dense oceanic or continental crust.

Deep ocean drilling and radiometric dating in the late 1960s gave an accurate stratigraphy and precise date of the ocean floor.

It didn't provide dates or chemical analyses of the ocean floor, but it did uncover long oceanic ridges, steep canyons and many other landforms that are indicators of plate tectonics.For that, geologists date and study continental crust.The lone outlier (the bright splash of purple that you see north of Africa) to all of this is the Mediterranean Sea.The ocean floor is a mysterious place that marine geologists and oceanographers have struggled to fully grasp.In fact, scientists have mapped more of the surface of the Moon, Mars and Venus than the surface of our ocean.

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