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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.
By this method, the age of oceans will equal the total salt in oceans (in grams) divided by rate of salt added (grams per year). Age of Earth was calculated to be 90-100 million years. Problems: no way to account for recycled salt, salt incorporated into clay minerals, salt deposits. 1  In 1860, the thickness of total sedimentary record is divided by average sedimentation rates (in mm/yr) and calculated to be about 3 million years old.