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Best Answer: The age of continental rocks are older than that of sea floor rocks. Ocean crusts form and deplete rapidly, and are generally quite young (180 million years or so for the oldest). Continental crusts generally are older (billions of years) because they deplete slowly, and mainly through erosion.
Isua Sediments-Greenland So it appears life was underway at least within 700 million years of the formation of the Earth (4.5 billions years ago). To-date these are actually the oldest sedimentary rocks yet discovered and the most ancient surface rocks on the planet.