Ancient traces of plate tectonics?

One of the best places for geologists to study ancient seaflooris the mountains. When continents collide and close up ocean basins, slivers of oceanic crust, called ophiolites, are sometimes thrust up into mountain belts. Because complete ophiolites have not been found in Archean-aged rocks (2.4 billion to 4 billion years ago), some scientists have speculated that the opening and closing of ocean basins, integral to plate tectonics today, did not operate during the earth's earliest geologic eon.

Now, in the July GEOLOGY, ...

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