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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.
Cratonic lithosphere is much older than oceanic lithosphere â up to 4 billion years versus 180 million years. The term craton is used to distinguish the stable portion of the continental crust from regions that are more geologically active and unstable.Cratons can be described as shields, in which the basement rock crops out at the surface, and platforms, in which the basement is overlain by sediments and sedimentary rock.ratonic lithosphere is much older than oceanic lithosphere â up to 4 billion years versus 180 million years. The term craton is used to distinguish the stable portion of the continental crust from regions that are more geologically active and unstable.